Product User Manual for the "Air Mass Analysis" product
Contents
1. C PLOT THE BLACK STRIPE CALL PSETC GRAPH POSITION MODE GEOGRAPHIC CALL PSETC GRAPH LINE STYLE SOLID CALL PSETC GRAPH_TYPE CURVE CALL PSETC GRAPH_CURVE_METHOD ROUNDED CALL PSETC GRAPH_CURVE_INTERPOLATION SPLINE CALL PSETI GRAPH_SMOOTHING_FACTOR 1 CALL PSETIR GRAPH CURVE X VALUES CONTOURX 1 K 1 K 1 CALL PSETIR GRAPH CURVE Y VALUES CONTOURY 1 K 1 K 1 CALL PSETC GRAPH LINE COLOUR MAGENTA CALL PSETI GRAPH_LINE_THICKNESS 1 CALL PGRAPH GOTO 31 NEXT STRIPE C CLOSE BUFR FILE CLOSE MAGICS 33 CALL PBCLOSE IUNIT IRET CALL PCLOSI EE NWC SAF ZAM Product User Manual for the Air Mass Analysis product AMA PGE12 v2 1 Code SAF NWC CDOP ZAMG SCI PUM 12 Issue 2 1 2 Date 21 October 2010 File SAF NWC CDOP ZAMG SCI PUM 12_ v2 1 2 Page 25 26 END Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 2 Date 21 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12_v2 1 2 Page 26 26 NWC SAF ZAM 7 REFERENCES Bader M J Forbes G S Grant J R Lilley R B E and Waters A J Eds 1995 Images in weather forecasting Cambridge University Press Cambridge Carlson T N 1991 Mid latitude weather systems Routledge London Jann A 2002 Use of a simple pattern recog2. Code SAF NWC CDOP ZAMG SCI PUM 12 Issue 2 1 2 Date 21 October 2010 File SAF NWC CDOP ZAMG SCL PUM I2 v2 12 Page 1 26 Product User Manual for the Air Mass Analysis product AMA PGE12 v2 1 NWC SAF ZAM Product User Manual for the Air Mass Analysis product AMA PGE12 v2 1 SAF NWC CDOP ZAMG SCI PUM 12 Issue 2 Rev 1 2 21 October 2010 Applicable to SAFNWC MSG version 2011 The EUMETSAT Network of Satellite Application Facilities Support to Nowcasting and Very Short Range Forecasting Prepared by ZAMG Page 2 26 Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 12 Date 21 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 2 NWC SAF ZAM REPORT SIGNATURE TABLE Prepared by ZAMG 21 October 2010 Reviewed by ZAMG 21 October 2010 Pilar Fernandez Authorised by SAFNWC Project 21 October 2010 Manager Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 12 Date 27 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12_ v2 1 2 Page 3 26 NWC SAF ZAM DOCUMENT CHANGE RECORD CHANGES 2 0 16 September 2007 23 Initial version content derived from various precursor documents on PGE12 most notably Software User Manual for the SAFNWC MSG Scientific part for the PGE12 S Mel Update for the SAFNWC MSG release 2009 main
3. NWC SAF ZAM Code SAF NWC CDOP ZAMG SCI PUM 12 Issue 2 1 2 Date 21 October 2010 File SAF NWC CDOP ZAMG SCI PUM 12_v2 1 2 Page 12 26 0 _ cloudfree no gradient zone identified cloudfree gradient zone identified 2 127 cloudy information on gradient zone not relevant since only of significance in prefrontal areas IR greyscale image shown instead taken from the 13 4 micron channel Additionally the whole field might be filled with value 255 signalling that the entire gradient zone has been suspended either intended by the user or due to some problems seek additional log messages for further explanation The names of the output files adhere to the SAFNWC MSG convention on HDF5 file naming 2 Additionally the coordinates of special lines are provided In order to provide the user with the utmost flexibility these lines are not super imposed on the image but are described in separate BUFR files the used BUFR edition is No 4 The employed naming convention mimics the SAFNWC system for BUFR format files to the extent possible it actually adds only the designation of the sub product a dark stripes in WV imagery WVstripe b ridge lines of the eguivalent potential temperature field T Ridge Field Name Description Data Type Value Product_id 1 Identifier for SAFNWC 6 char SAFNWC Field Separator Separator 1 char _ underscore Pro
4. Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 2 Date 21 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 2 Page 6 26 NWC SAF ZAM 1 INTRODUCTION The Eumetsat Satellite Application Facilities SAF are dedicated centres of excellence for processing satellite data and form an integral part of the distributed EUMETSAT Application Ground Segment http www eumetsat int This documentation is provided by the SAF on Support to Nowcasting and Very Short Range Forecasting SAFNWC The main objective of SAFNWC is to provide further develop and maintain software packages to be used for Nowcasting applications of operational meteorological satellite data by National Meteorological Services More information can be found at the SAFNWC webpage http www nwesaf org This document is applicable to the SAFNWC processing package for Meteosat satellites meteorological satellites SAFNWC MSG 1 1 SCOPE OF THE DOCUMENT This document is the Product User Manual for MSG Air Mass Analysis Products PGE12 This document contains practical information on the characteristics of the above mentioned products on their applicability and limitations 1 2 SCOPE OF OTHER DOCUMENTS The algorithms used to extract the MSG Air Mass Analysis Products PGE12 are detailed in an Algorithm Theoretical Basis Document AD 4 The latest validation of the algorithms used
5. 0 extremum has to have in order to be are set to 0 eligible as a starting point of a ridge line internally tracking The first five entries are straightforward to set see also section 2 3 The other two parameters define the filtering of the ridge line product From v2008 on this product takes the NWP GRIB file provided by the user in s AFNWC import NWP _ data as it is and analyzes ridge lines on the NWP grid Thereby LAM output became permissible as input on the other hand this means that the developers can no longer control the meaning of significant ridge lines in terms of length of the ridge line and curvature of the isolines Length and curvature are encoded in the BUFR telegrams see section 2 3 and the two entries in the model configuration enable the user after some experience with his her own NWP data to set the filtering parameters appropriately if wished so At delivery the configuration parameters are basically functionless just reflecting that a line should consist of two points and a ridge is not cyclonic Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 2 Date 21 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12_v2 1 2 Page 18 26 NWC SAF ZAM 5 AIR MASS ANALYSIS AMA VALIDATION 5 1 SUMMARY OF AIR MASS ANALYSIS AMA VALIDATION RESULTS The air mass analysis products face some conceptual difficulties w r t to their
6. SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 2 Date 21 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12_v2 1 2 Page 5 26 NWC SAF ZAM List of Tables and Figures Table 1 List of Applicable Documents esse Re RR RA Re ee Re Re Re ee ee ee ee ee T Table 2 List of Referenced Doiuimients sr REEKSE Ee EDE Ge c eteted ieie ere ee ese eg gee gese 8 Table 3 File name components of AMA BUFR outPU iese esse sesse ee ee Re Re ee Re ee Re 12 Figure I Ridge line detection for an equivalent potential temperature field ECMWF forecast data the green lines indicate the positions of the automatically detected ridge axes Magenta isolines encircle the WV dark stripes that are identified by the respective part of the SAFNWC AMA package Case 16 November 2007 0845 UTC esse esse esse esse ee see ee ee se ee 19 Figure 2 Example display of the SAFNWC air mass classification product Case of 16 November 2007 0915 UTC unclassified cloudy pixels appearing in black Prevailing on the display is tropical continental and polar continental air see attached colour legend optional Stability inclusion Was turned Of ass EER iieiea ERA endeared ei isin 20 Figure 3 Example display of the SAFNWC gradient zone product as seen in the HDFView software Case of 19 June 2007 1630 UTC gradient zone painted red cloudy pixels plotted DU BUCA CO OE EO EE wad se en ee 20
7. empirical threshold either the gradient s x component or y component has to have the same sign all over the indicated zone otherwise two gradient zones would be joined which for geometrical reasons are unlikely to represent the same prefrontal region The product is cleaned in such a manner that gradient zone markers are withdrawn in regions where the SAFNWC MSG cloud mask reports clouds in those areas the product shows pixel values of an IR channel Note that the large scale check on the gradient zone comes first i e due to cloud masking some small patches of indicated gradient may appear in the final product 2 3 DESCRIPTION OF AIR MASS ANALYSIS AMA OUTPUTS This product consists of several sub products with different output format 1 The air mass classification product AMA CL provides air mass designations at pixel resolution The product format is HDF5 From v2008 on the gradient zone of the NWP equivalent potential temperature field product is an image like product packed into the same HDFS file product code AMA GZ There is moreover a quantity AMA QUALITY which represents a quality flag implemented in a first version in v2009 and possibly to be augmented in subsequent releases The number of air mass classes in the current version PGE12 of SAFNWC MSG release v2011 is 9 or 17 depending on whether the user turns the LI inclusion option off or on 8 Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manua
8. on NWP data the reprocessed NWP data have to be available in the DATABUF directory SAFNWC tmp Ensure that the SEVIRI image file in HRIT format mandatory input is available in the directory SAFNWC import SEVIRI data Make sure that the environment variable SAFNWC is set The environment variable BUFR_TABLES need also be set as SAFNWC src bufr_000360 bufrtables Make sure that the following supplementary files are available a SAFNWC src bufr_000360 bufrtables B0000000000098002001 TXT b SAFNWC src bufr_000360 bufrtables D0000000000098002001 TXT c SAFNWC import Aux_data Topo_ 000 00 dat for METEOSAT 8 Topo _ 009 50 dat These files are not included in the PGE12 distribution because they are packed into other libraries also delivered with SAFNWC MSG The listed files should be available after unpacking the full SAFNWC MSG SW package as described in the relevant documentation Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 2 Date 21 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 2 Page 15 26 NWC SAF ZAM Then the processing of PGE12 is automatically monitored by the task manager see the Software Users Manual for the Task Manager of the SAFNWC MSG software Submitting PGE12 in stand alone mode not using the task manager Ensure that all required input data are available in their respective directories and
9. to extract the MSG Air Mass Analysis Products PGE12 is reported in a validation report AD 5 Instructions to install configure and execute the SAFNWC MSG software in order to extract the MSG Air Mass Analysis Products PGE12 are detailed in a Software User Manual AD 3 The Interface Control Documents AD 1 for the External and Internal Interfaces of the SAFNWC MSG and AD 2 MSG Output Product Format Definition detail the input and output data format for the SAFNWC MSG software 1 3 SOFTWARE VERSION IDENTIFICATION This document describes the products obtained from the PGE12 version included in the 2011 SAFNWC MSG software package delivery 1 4 IMPROVEMENT FROM PREVIOUS VERSION Allows the selection of sub products i e the user can switch off parts in which s he is not interested Uses the new SPhR instability products instead of the previously used SAI 1 5 DEFINITIONS ACRONYMS AND ABBREVIATIONS AMA Air Mass Analysis cfm PGE12 model configuration file nominally at SAFNWC config safnwe_pge1l2 cfm Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 12 Date 21 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12_v2 1 2 Page 7 26 NWC SAF ZAM ECMWF European Centre for Medium range Weather Forecasts EUMETSAT European Organisation for the Exploitation of Meteorological Satellites GEOS Geostationary HDF Hierarchical data Format HRIT High
10. v2 1 2 Page 19 26 NWC SAF ZAM 6 EXAMPLES OF AIR MASS ANALYSIS AMA VISUALISATION Figure 1 shows the visualization of the BUFR products WV stripes and ridge lines of equivalent potential temperature Figure 2 gives an example how the air mass classification product may be presented to the user and Figure 3 provides a glance on a gradient zone output Sat 11088 2007 11 16 08 45 ag 39 89 we ede ogb Bild 1 ar Paas sie zebi Bild 1 Figure 1 Ridge line detection for an equivalent potential temperature field ECMWF forecast data the green lines indicate the positions of the automatically detected ridge axes Magenta isolines encircle the WV dark stripes that are identified by the respective part of the SAFNWC AMA package Case 16 November 2007 0845 UTC Code SAF NWC CDOP ZAMG SCI PUM 12 s P YN P 7 tober 2010 Product User Manual for the Air Mass ai 2 12 Date 21 October 2010 on GE gt SAF NWC CDOP ZAMG SCI PUM 12_v2 1 2 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12_v l 2 Page 20 26 MSG SAFNWC 20071116 09 15 ir Mass Analysis equatorial maritime unstable hi a equatorial continental unstable tropical maritime unstable m trapical cantinental unstable polar maritime unstable A polar continental unstabla arctic maritime unstable arctic centinental unstable equatorial maritime stable equatorial continental stable
11. validation described in more detail in the two AMA validation reports RD 1 and AD 5 In this situation the issues of validation in AD 5 were subjective judgements on whether the indicated ridge lines stripes were analysed in a similar fashion as a trained meteorologist would do whether these analyses are stable in time whether the analyses are stable against changes in the region selected by a user In RD 1 moreover actually observed cases of convection were used as starting points and it was investigated whether these were somehow predictable from the AMA products Most recently the air mass classification was judged against tropopauses derived from IASI and ATOVS level 2 profiles AD 5 Test 5 A slight change of algorithmic thresholds was proposed as aresult and these changes were implemented in v2009 In summary based on those subjective evaluations the products of v2010 give no reason for serious concern The two sub products being judged as hardly acceptable in RD 1 namely air mass classification and gradient zone saw a complete refurbishment of their concepts so the criticism expressed in this document today no longer holds 5 2 TYPICAL KNOWN PROBLEMS AND RECOMMENDATION FOR USE Pattern recognition routines generally benefit from large analysis area the more one sees from the surrounding the more certain is the analysis of the local pattern It is therefore in principle possible even though th
12. AGICS_METAFILE EXPORT_PATH 1 INDEXPO T Ridge cgb JI PUTENV MM CALL PSETC SUPER_PAGE_FRAME ON CALL PSETR SUPER PAGE X LENGTH 29 7 SUPER PAGE Y LENGTH 24 0 CALL PSETR PAGE X LENGTH 29 7 CALL PSETR PAGE Y LENGTH 24 0 CALL PSETR Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 2 Date 21 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 2 Page 22 26 NWC SAF ZAM SUBPAGE X POSITION 2 23 SUBPAGE_Y_POSITION 1 05 SUBPAGE X LENGTH 22 41 SUBPAGE Y LENGTH 17 85 CALL PSETR CALL PSETR CALL PSEIR CALL PSETR CALL PSETC SUBPAGE MAP PROJECTION POLAR STEREOGRAPHIC CALL PSETC SUBPAGE MAP AREA DEFINITION CORNERS CALL PSETR SUBPAGE MAP VERTICAL LONGITUDE O0 0 CALL PSETR SUBPAGE LOWER LEFT LONGITUDE 29 5 CALL PSETR SUBPAGE LOWER LEFT LATITUDE 22 6 CALL PSETR SUBPAGE UPPER RIGHT LONGITUDE 73 1 CALL PSETR SUBPAGE UPPER RIGHT LATITUDE 56 3 EAU Oe Tn N a TTET Tt TO ene ETE eae ae ES EELT ETETETT TEET ETETE DECODE BUFR FILE CONTAINING THE SAFNWC AMA RIDGE LINE OF EOUIVALENT POTENTIAL TEMPERATURE PRODUCT GeO OE RA GR ene ar e
13. INES AUTHOR ALEXANDER JANN ZAMG VIENNA AUSTRIA CREATION DATE 13 07 2001 CP OO QOQA KIND PROGRAM SAFNWC_AMA_BUFR PARAMETER JSEC0 3 JSEC1 40 JSEC2 64 JSEC3 4 JSEC4 2 PARAMETER JELEM 20000 JSUP 9 JBYTE 80000 PARAMETER KELEM 20000 KVALS 80000 KVALS1 80000 DIMENSION KBUFF 20000 KSUP JSUP THIS IS INTENDED TO REPRESENT A USEFUL SUPPORT TO USERS OF THE SAFNWC MSG SOFTWARE PACKAGE BUT COMES WITHOUT WARRANTY OF ANY DIMENSION KSECO JSECO KSEC1 JSEC1 KSEC2 JSEC2 KSEC3 JSEC3 DIMENSION KSEC4 JSEC4 ifndef R_4 REAL 8 VALUES KVALS1 else REAL VALUES KVALS1 endif DIMENSION CONTOURX 20000 CONTOURY 20000 MARKSYM 20000 CHARACTER 80 CVALS KVALS CGBNAMEINTRO EXPORT PATH CHARACTER 24 CUNITS KELEM CHARACTER 64 CNAMES KELEM CHARACTER 255 MM DATA MARKSYM 20000 1 CGBNAME INTRO SAFNWC_MSG1_AMA__00160_024 Region_ZAMG_ N GETENV SAFNWC EXPORT_PATH EXPORT_PATH EXPORT_PATH 1 INDEX EXPORT_PATH 1 export PGE12 INDEXPO INDEX EXPORT_PATH 1 C OPEN MAGICS DEFINE GRAPHICAL DEVICE AND FIX GEOGRAPHICAL AREA CALL POPEN CALL PNEW SUPER PAGE CALL PNEW PAGE CALL PSETI WORKSTATION_COUNT 1 CALL PSETC WORKSTATION_1 CGM_BINARY CALL PSETC PAGE_FRAME OFF MM M
14. ODE GEOGRAPHIC CALL PSETC GRAPH_LINE_STYLE SOLID CALL PSETC GRAPH_TYPE CURVE CALL PSETC GRAPH_CURVE_METHOD ROUNDED CALL PSETC GRAPH_CURVE_INTERPOLATION SPLINE CALL PSETI GRAPH_SMOOTHING_FACTOR 1 CALL PSETIR GRAPH CURVE X VALUES CONTOURX 1 K 1 K 1 CALL PSETIR GRAPH CURVE Y VALUES CONTOURY 1 K 1 K 1 CALL PSETC GRAPH LINE COLOUR GREEN CALL PSETI GRAPH LINE THICKNESS 3 CALL PGRAPH GOTO 11 NEXT RIDGE LINE C CLOSE BUFR FILE CLOSE MAGICS GO ON TO NEXT PRODUCT 13 CALL PBCLOSE IUNIT IRET CALL PCLOSE C s C C RE OPEN MAGICS DEFINE GRAPHICAL DEVICE AND FIX GEOGRAPHICAL AREA CALL POPEN CALL PSETI WORKSTATION_COUNT 1 CALL PSETC WORKSTATION_1 CGM_BINARY CALL PSETC PAGE_FRAME OFF MM MAGICS_METAFILE EXPORT_PATH 1 INDEXPO WVstripe cgb JI PUTENV MM CALL PSETC SUPER_PAGE_FRAME ON CALL PSETR SUPER_PAGE_X_LENGTH 29 7 CALL PSETR SUPER_PAGE_Y_LENGTH 24 0 CALL PSETR PAGE_X_LENGTH 29 7 CALL PSETR PAGE_Y_LENGTH 24 0 CALL PSETC SUBPAGE_MAP_PROJECTION POLAR_STEREOGRAPHIC CALL PSETC SUBPAGE MAP AREA DEFINITION CORNERS CALL PSETR SUBPAGE MAP VERTICAL LONGITUDE O0 0 CALL PSETR SUBPAGE LOWER LEFT LONGITUDE 29 5 CALL PSETR SUBPAGE LOWER LEFT LATITUDE 22 6 CALL PSETR SUBPAGE UPPER RIGHT LONGITUDE 73 1 CALL PSETR SUBPAGE UPPER RIGHT LATITUDE 56 3 CALL PSETR SUBPAGE X POSITION 2 23 CALL PSETR SUB
15. PAGE Y POSITION 1 05 CALL PSETR SUBPAGE X LENGTH 22 41 CALL PSETR SUBPAGE_Y_LENGTH 17 85 C CETE A e e Ed de EE E ae REDE dd REM EN E e e E e d C DECODE BUFR FILE CONTAINING THE SAFNWC AMA DARK STRIPE OF WATER VAPOUR IMAGE PRODUCT C E TAER E ERA AE NUN OE E di AE i i e E E AR ER aE DRR dd IRET 0 CALL PBOPEN IUNIT EXPORT_PATH 1 INDEXPO Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 2 Date 27 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 2 Page 24 26 NWC SAF ZAM CGBNAMEINTRO 1 INDEX CGBNAMEINTRO WVstripe buf E IRET IF IRET NE 0 GOTO 33 ERROR IN PBOPEN KERR 0 IRET 0 KBUFL 0 31 CONTINUE C EXTRACT COORDINATES OF ONE BLACK STRIPE CALL PBBUFR IUNIT KBUFF JBYTE KBUFL IRET IF IRET EQ 1 GOTO 33 EOF KBUFL KBUFL 4 1 KEL KELEM CALL BUFREX KBUFL KBUFF KSUP KSECO KSEC1 KSEC2 KSEC3 KSEC4 KEL CNAMES CUNITS KVALS VALUES CVALS KERR IF KERR NE 0 THEN WRITE 6 ERROR DURING DECODING GOTO 33 END IF COPY THE LONGITUDE AND LATITUDE VALUES TO CONTOURX AND CONTOURY RESPECTIVELY STRUCTURE OF VALUES REPLICATION FACTOR LAT LONG LAT LONG OOONA DO 32 K 1 VALUES 1 CONTOURY K VALUES 2 K CONTOURX K VALUES 2 K 1 32 CONTINUE
16. Rate Information Transmission IR Infrared LAM Limited Area Model LI Lifted Index MSG Meteosat Second Generation NWP Numerical Weather Prediction PGE Product Generation Element OC Quality Control SAF Satellite Application Facility SAFNWC SAF to support NoWCasting and Very Short Range Forecasting SAI Stability Analysis Imagery SEVIRI Spinning Enhanced Visible amp Infrared Imager SPhR SEVIRI Physical Retrieval SUM Software User Manual TPW Total Precipitable Water Wy Water Vapour 1 6 REFERENCES 1 6 1 Applicable Documents For dated references subsequent amendments to or revisions of any of these publications do not apply For undated references the latest edition of the document referred to applies Latest documentation can be found at the SAFNWC Help Desk at http www nwcsaf org Reference Title Code Vers Date AD 1 Interface Control Document for the External SAF NWC CDOP INM SW ICD 1 and Internal Interfaces of the SAFNWC MSG AD 2 SAFNWC MSG Output Products Format SAF NWC CDOP INM SW ICD 3 Definition AD 3 Software User Manual for the SAFNWC MSG SAF NWC CDOP INM SW SUM application 2 AD 4 Algorithm Theoretical Basis Document for the SAF NWC CDOP ZAMG SCI AT Air Mass Analysis product AMA PGE12 BD 12 AD 5 Validation Report for Air Mass Analysis SAF NWC CDOP ZAMG SCI VA 1 0 29 09 08 AMA PGE12 v2 1 L 3 Table 1 List of Applicable Documents 1 6 2 Reference Documents The refere
17. WC MSG 4 2 CONFIGURABLE PARAMETERS FOR AIR MASS ANALYSIS AMA The configurable parameters can be found in the model configuration file for the PGE12 which is separated into two parts The first section contains three parameters that can be set by the user Then starting with the entry PGE_ID the rest of the model configuration file is constituted by a section that should be touched only by the institute responsible for development maintenance of PGE12 which at present is ZAMG Keyword Possible Value s CLASSIFICATION PRODUCT Decide whether the air mass classification chain of characters YES or NO product is computed WV_STRIPE PRODUCT Decide whether the WV dark stripe chain of characters YES or NO product is computed Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 12 Date 27 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12_ v2 1 2 Page 17 26 NWC SAF ZAM Keyword Description Type Possible Value s computed product is computed INCORPORATE LI Decide whether the NWCSAF SPhR LI chain of characters YES or NO product should be incorporated in the AMA air mass classification process RL MinLength The minimum length in terms of NWP integer all yet values lt 2 grid points a ridge line has to have in are set to 2 order to appear in the output internally RL MinAbsCurvature The minimum anticyclonic curvature an float all yet values lt
18. duct id 2 Spacecraft identifier 4 char MSGi where i is an integer Field Separator Separator 1 char underscore Product_id 3 product name 4 char The PGE specific code AMA Field Separator Separator 1 char underscore Product_id 4 Date time of acquisition of 12 char yyyymmddhhmm SEVIRI image Field Separator Separator 1 char _ underscore Product_id 5 Name of processed region 12 char Taken from the entry under REGION in the region configuration file and padded by underscores where needed Field Separator Separator for extension 1 char bea Product_id 6 Name of sub product variable Name of the sub product coded in the number of BUFR file One of the following char WVstripe T Ridge Field Separator Separator for extension 1 char aa Extension Extension of the product name 3 char buf to indicate the type of data Table 3 File name components of AMA BUFR output The template of the BUFR files is as follows 101000 SPECIFICATION OF THE REPLICATION 031002 EXTENDED DELAYED DESCRIPTOR REPLICATION FACTOR 301023 expands to 005002 LATITUDE COARSE ACCURACY 006002 LONGITUDE COARSE ACCURACY 011021 RELATIVE VORTICITY l This entry appears only in the ridge line product The product derivation starts with the computation of a pseudo curvature vorticity which describes the curvature of the NWP 850 hPa equivalent potential temperature isolines The interna
19. e robustness for the common 512x512 pixel region has been verified that users select a too small analysis region Note that the flexibility on the region was introduced in v2008 in response to an understandable user request not on scientific grounds before that PGE12 used a large region covering all of Europe and substantial parts of the Atlantic Ocean With the tuning process being mainly done on subjective reasoning a certain risk of differing perception among different individually cannot be ruled out Most sub products of PGE12 are based on the objective recognition of certain patterns that MAY indicate imminent convective activity None of these features is by itself a trigger of convective activity In fact there is no doubt that in the majority of cases or over most of the extension of such a phenomenon no severe weather is found Consequently they have always to be considered in conjunction with other relevant meteorological material not on their own Unfortunately with respect to setting the configurable parameters for ridge line detection section 4 2 no guidelines can be presented at the time being as this option has been introduced only very recently and it is moreover hardly possible to cover all the different NWP input users may provide Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 12 Date 21 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12_
20. ee oe BA eat Mona IRET 0 CALL PBOPEN IUNIT EXPORT PATH 1 INDEXPO CGBNAMEINTRO 1 INDEX CGBNAMEINTRO T Ridge buf r IRET IF IRET NE 0 GOTO 13 KERR 0 IRET 0 KBUFL 0 11 CONTINUE Cc EXTRACT COORDINATES OF ONE RIDGE LINE CALL PBBUFR IUNIT KBUFF JBYTE KBUFL IRET IF IRET EQ 1 GOTO 13 KBUFL KBUFL 4 1 KEL KELEM CALL BUFREX KBUFL KBUFF KSUP KSECO KSEC1 KSEC2 KSEC3 KSEC4 KEL CNAMES CUNITS KVALS VALUES CVALS KERR IF KERR NE 0 THEN WRITE 6 ERROR DURING DECODING GOTO 13 END IF c COPY THE LONGITUDE AND LATITUDE VALUES TO CONTOURX AND CONTOURY c RESPECTIVELY G STRUCTURE OF VALUES REPLICATION FACTOR LAT LONG LAT c LONG DO 12 K 1 VALUES 1 CONTOURY K VALUES 2 K CONTOURX K VALUES 2 K 1 12 CONTINUE C PLOT THE zal W IDGE LINE Product User Manual for the Air Mass Analysis product AMA PGE12 v2 1 File Code Issue SAF NWC CDOP ZAMG SCI PUM 12 2 1 2 Date 21 October 2010 SAF NWC CDOP ZAMG SCI PUM 12_v2 1 2 Page 23 26 NWC SAF ZAM CALL PSETC GRAPH_POSITION_M
21. ether the pixel is dark enough to be eligible ie whether it is darker than an empirical threshold brightness temperature has to be gt 40 5 C 2 For each candidate pixel it is verified that it is darker than most of its neighbours 3 The pixels passing the test undergo postprocessing a contouring algorithm is applied to encircle sufficiently extended conglomerates of such pixels 2 2 3 Ridge line product algorithm outline The SAFNWC AMA package determines the ridge line of the equivalent potential temperature derived from NWP forecast fields of temperature and humidity as follows e Computation of a pseudo curvature vorticity which describes the curvature of the NWP 850 hPa equivalent potential temperature isolines e For each point determination of number of neighbours N with higher values of pseudo curvature vorticity less anticyclonic neighbours Generally a point should have N 26 in order to be eligible However it can be shown and justified that occasionally also points with N 4 or N 5 need to be taken into account A negative pseudo curvature vorticity is a natural further prerequisite for eligibility Then a ridge of the function is tracked by e repeated determination of the direction of smallest descent of the N function starting from a local minimum 2 2 4 Gradient zone product algorithm outline Main criterion for indicated gradient zone sufficiently extended zone of gradient above an
22. l absolute value of this quantity at the starting point of the ridge line tracking a local maximum of anticyclonicity is provided It should be a measure how distinctive the pattern is and therefore can be exploited to filter weakly developed ridges via a user set keyword in the PGE12 model configuration file Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 2 Date 21 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12_ v2 1 2 Page 13 26 NWC SAF ZAM The output files contain as many BUFR records as there are identified black stripes or ridge lines respectively NWC SAF ZAM Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 2 Date 21 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12_v2 1 2 Page 14 26 3 IMPLEMENTATION OF AIR MASS ANALYSIS AMA AMA is extracted by PGE12 of the SAFNWC MSG software package Detailed information on how to run this software package are available in the Software User Manual for the SAFNWC MSG application AD 3 The implementation of the PGE12 software follows the general implementation of components of the SAFNWC MSG software see the software part of the Software Users Manual of the SAFNWC MSG software for more details Basically the following steps are needed to run the PGE12 software l Create or update configura
23. l for the Air Mass Issue 2 1 2 Date 21 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12_ v2 1 2 Page 11 26 NWC SAF ZAM placeholders for possible future use with the following coding if SPhR LI inclusion is not selected or the SPhR LI product is missing the lower numbers are selected and classes 13 to 24 do not appear Code Polar continental stable Polar reserved for future use 4 2 Code o 4 6 7 s o9 10 u 3 i4 is i6 7 8 9 gt gt gt gt gt ies aie ic reserve a gt gt T e r 2 gt riti gt 6 7 10 11 1 13 14 15 16 17 18 19 0 21 The parameter AMA QUALITY can assume values in the range 0 4 or 255 with the following meanings no QC possible because pixel cloudy in at least P oeeo ke Sonra Clie os 1 no change in thermal category i e arctic polar tropical or equatorial and moisture category maritime vs continental between current and previous slot change in moisture category change in thermal category change in both moisture and thermal category Air mass classification suspended either intended by the user or due to some problems seek additional log messages for further explanation The gradient zone product has 128 different count values with the following meaning Product User Manual for the Air Mass Analysis product AMA PGE12 v2 1
24. ly on new quality flag 2 1 1 8 September 2009 Minor mainly editorial updates for the SAFNWC MSG release 2010 No scientific updates 21 October 2010 26 Minor updates for the SAFNWC MSG release 2011 No scientific updates Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 2 Date 21 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 2 Page 4 26 NWC SAF ZAM Table of contents 1 INTRODUCTION vississsscssscancacssanesanasonnsesanoncnncanananasacanannseaansnausneassasssansseenioesisncionsnstenonsnadaeaseasy 6 1 1 EE GE THE DOCUNEN bee ee ere eee es Mey ear tte res evra ert Hers ier cet Deen en oreer Taner Ae 6 1 2 SCOPE OF OTHER DOCUMENTS RR OE EE 6 1 3 SOFTWARE VERSION IDENTIFICATION js iese ske ese Ee ek Re sees Nee se ks ee siese Ne eke ek ee 6 1 4 IMPROVEMENT FROM PREVIOUS VERSION sesse Ses Se Bes Se eg Se eN ee Gee see Ses EE See ede 6 1 5 DEFINITIONS ACRONYMS AND ABBREVIATIONSG csssssccscscecesssssssseceeecceecssssseseseseeeeseeessaeeess 6 16 KERE ee ne EO ee eee ee ee ere ee 7 LO AE EE EE EG EE ee ee Ne 7 EE RE nee RE EE EA HE EL OR EE OE N N EE 7 2 DESCRIPTION OF THE AIR MASS ANALYSIS AMA PRODUCTS sees sesse sesse 9 2 1 GOAL OF THE AIR MASS ANALYSIS AMA PRODUCTS esse esse esse see ee ee ee ee ee ee ee ee ee 9 2 2 OUTLINE OF AIR MASS ANALYSIS AMA ALGORITHMS c cccessseeessceesseeeeseeeeeeeenseeeeeseeee
25. nce documents contain useful information related to the subject of the project This reference document complements the applicable documents For dated references subsequent amendments to or revisions of any of these publications do not apply For undated references the latest edition of the document referred to applies NWC SAF ZAM Product User Manual for the Air Mass Analysis product AMA PGE12 v2 1 Code SAF NWC CDOP ZAMG SCI PUM 12 Issue 2 1 2 Date 21 October 2010 File SAF NWC CDOP ZAMG SCI PUM 12_ v2 1 2 Page 8 26 Latest documentation can be found at the SAFNWC Help Desk at http www nwcsaf org EES EIE EE EE RD 1 Scientific report on Validation and Tuning of ee EE WC IOP ZAMG SCI VAL 1 1 0 19 08 05 MSG PGE12 RD 2 Table 2 List of Referenced Documents Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 12 Date 21 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCLPUM I2 v2 1 2 Page 9 26 NWC SAF ZAM 2 DESCRIPTION OF THE AIR MASS ANALYSIS AMA PRODUCTS 2 1 GOAL OF THE AIR MASS ANALYSIS AMA PRODUCTS PGE12 of the SAFNWC MSG provides several products considered useful for air mass analysis Well established concepts from literature were taken and implemented adapted for a use with SEVIRI imagery supplemented where necessary by NWP products A rather classical classification of air masses as functi
26. nition approach for the detection of ridge lines and stripes Meteorol Appl 9 357 365 Martin F Elizaga F and Riosalido R 1999 The mushroom configuration in water vapour imagery and operational applications Meteorol Appl 6 143 154 ZAMG 2005 Manual of synoptic satellite meteorology Conceptual models CD ROM version 6 0 available from ZAMG and online on http www zamg ac at docu Manual start htm
27. on of total precipitable water and temperature derived from satellite data Tongues of equivalent potential temperature indicate protruding warm and moist air in which severe local convection is most likely to occur Carlson 1991 Bader et al 1995 ZAMG 2005 Therefore an objective determination of the ridge lines of the equivalent potential temperature field is performed Indication of areas where there is high probability for the initiation of convection the areas at the leading edge of frontal cloud bands Therefore the pre frontal regions with high gradients of equivalent potential temperature are marked Dry air in the upper troposphere is another air mass type that is important in two respects e Dry air overrunning frontal zones is connected to the development of intensive convection at the leading parts of fronts ZAMG 2005 e The boundaries between wet and dry air boundaries between gray and black stripes in WV are preferred zones for initiation of convection Martin et al 1999 ZAMG 2005 2 2 OUTLINE OF AIR MASS ANALYSIS AMA ALGORITHMS 2 2 1 Air mass classification algorithm outline The implemented scheme is based on finding reference pixels where IR13 4 almost certainly indicates the correct air mass type The motivation to use IR13 4 is that this is the only IR channel with a weighting function not peaking at the earth s surface thus mitigating land heating effects Then the WV7 3 brightness temperature at the
28. saes 9 2 2 1 Air mass classification algorithm OUTLINE sosccccssccsscensesssnsessccsscsssosasscsoscssanctescessdessseesscenseosse 9 222 WV dere pe detechon algorithm outline oe sie seed e iN Ri eis dei se eke EE iN NN ee Ee ede 10 2 2 3 Ridge line product algorithm CRETE EE EE EE ER EE EDEN Ee 10 2 2 4 Gradient zone product algorithm outline esse esse isdie ee dd Ek AR de GR Ad ed ed 10 2 3 DESCRIPTION OF AIR MASS ANALYSIS AMA OUTPUTS ese sesse esse ee ee ee ee ee ee ee ee ee 10 3 IMPLEMENTATION OF AIR MASS ANALYSIS AMA esse esse sesse esee see sees see sees sees 14 4 INPUTS AND CONFIGURABLE PARAMETERS FOR AIR MASS ANALYSIS 1 1 ee ee 16 4 1 LISTOF INPUTS HR oni OR EE RO AE EE N AE irr 16 4 1 1 Air mass classification prodi RE EE ED 16 LLL ME ME SUPE PTOUR EEE EAO OOOO een 16 Ahd Ridge Mne Produet eae EEEE OE 16 4 1 4 Gradient zone of equivalent potential temperature product sses 16 4 2 CONFIGURABLE PARAMETERS FOR AIR MASS ANALYSIS AMA ees esse esse ee ese ee ese see ee 16 5 AIR MASS ANALYSIS AMA VALIDATION sesse sesse soes ese see Ge Ee Ge EG Ge Ge Ge SG 18 5 1 SUMMARY OF AIR MASS ANALYSIS AMA VALIDATION RESULTS sesse esse esse ee esse ese ee se ee ee 18 5 2 TYPICAL KNOWN PROBLEMS AND RECOMMENDATION FOR USE iese sesse ee esse ee esse ee ese ee esse ee es 18 6 EXAMPLES OF AIR MASS ANALYSIS AMA VISUALISATION cscsssssssssoees 19 Je REFERENCES canunninnncniinininnminininininin hn 26 Code
29. se pixels together with longitude and often more importantly latitude information is subject to multiple linear regression with air mass type categories arctic to equatorial numerically translated to values of a fractional air mass code hereafter FAMC from 1 0 to 4 0 as the dependent variable Under the assumption that equatorial air masses are never adjacent to polar or arctic air and tropical and arctic air masses are always separated by the polar category the problem becomes one of multifold multiple linear regression applied to the separation sub problems separation of arctic from polar separation of polar from tropical separation of tropical from equatorial After some releases based on the NWCSAF product total precipitable water TPW v2008 switched over to a NWP derived TPW TPW thresholds between continental and maritime air masses are dependent on the numerical values of the functions obtained in the regressions For Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 12 Date 21 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCLPUM I2 v2 1 2 Page 10 26 NWC SAF ZAM perfectly arctic polar tropical and equatorial air the thresholds are respectively 0 48 1 13 2 66 and 6 25 cm 2 2 2 WV dark stripe detection algorithm outline The detection of dark stripes has the following principal steps 1 For each pixel it is checked wh
30. that pre requirements listed under items 1 8 are fulfilled PGE12 can be called as follows from the directory where it is situated PGE12 YY YYMMDDhhmm region configuration file model configuration file Example JPGE12 200303281145 myregion cfg safnwc pgel 2 cfm Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 12 Date 27 October 2010 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 2 Page 16 26 NWC SAF ZAM 4 INPUTS AND CONFIGURABLE PARAMETERS FOR AIR MASS ANALYSIS AMA 4 1 LIST OF INPUTS 4 1 1 Air mass classification product e SEVIRI IR imagery channels 7 3 and 13 4 e NWP information temperature und humidity information in various levels in DATABUF format as preprocessed by the SAFNWC MSG application e SAFNWC MSG product Cloud mask which is the output of PGEO1 of the SAFNWC MSG e Optionally Lifted Index imagery SPhR LI which is output of PGE13 of the SAFNWC MSG 4 1 2 WV dark stripe product e SEVIRI WV image channel 6 2 4 1 3 Ridge line product e ECMWF NWP GRIB data temperature und humidity information in 850hPa 4 1 4 Gradient zone of equivalent potential temperature product e ECMWF NWP data temperature und humidity information in 850hPa in DATABUF format as preprocessed by the SAFNWC MSG application e SEVIRI IR imagery channel 13 4 e SAFNWC MSG product Cloud mask which is the output of PGE01 of the SAFN
31. tion files system region model and run configuration files according to their format see the Interface Control Document ICD 1 for the External and Internal Interfaces of the SAFNWC MSG Files are situated in SAFNWC config In particular if the optional SPhR LI inclusion of PGE12 is desired set the entry INCORPORATE LI in the model configuration file SAFNWC config safnwc pgel2 cfm to YES default in the delivery is NO If only a sub selection of PGE12 products is required modify the relevant entries CLASSIFICATION PRODUCT WV_STRIPE PRODUCT RIDGE LINE PRODUCT GRADIENT ZONE PRODUCT in the model configuration files accordingly default in the delivery is YES i e all products are ordered change to NO if a certain sub product shall be suspended Algorithm configuration files are situated in the directory SAFNWC import Aux_data PGE12 These PGE12 input files are provided with the software package installed together with it and are not foreseen for modification by users The cloud mask CMa input which is the output of PGEO1 of the SAFNWC MSG matching slot and region has to be made available in the directory SAFNWC export PGE01 Provided the user requested the inclusion of optional stability analysis imagery SPhR LI input which is an output of PGE13 of the SAFNWC MSG SPhR data matching slot and region have to be made available in the directory SAFNWC export PGE 13 For producing the products based
32. tropical maritime stable tropical continentalf stable polar maritimel stable polar centinentalf stable arctic maritime stable arctic continental stable gt unclassified Figure 2 Example display of the SAFNWC air mass classification product Case of 16 November 2007 0915 UTC unclassified cloudy pixels appearing in black Prevailing on the display is tropical continental and polar continental air see attached colour legend optional stability inclusion was turned off Figure 3 Example display of the SAFNWC gradient zone product as seen in the HDF View software Case of 19 June 2007 1630 UTC gradient zone painted red cloudy pixels plotted in greyscale Product User Manual for the Air Mass Issue 2 1 2 Date 21 October 2010 Analysis product AMA PGE12 v2 1 eh SAF NWC CDOP ZAMG SCI PUM 12 v2 1 2 age NWC SAF ZAM Code SAF NWC CDOP ZAMG SCI PUM 12 For convenience the source code of the production program that drew the graphics in Figure 1 is included below Users are probably most interested in the sections on BUFR decoding hence these parts are highlighted by boldface printing Note that the BUFR decoding sections are virtually identical for the two sub products The other parts of the program mainly contain commands to accomplish the graphics output by the MAGICS package THIS IS A DEMO BUFR DECODING ROUTINE FOR LONGITUDE LATITUDE INFORMATION SUBMITTED BY SAFNWC AMA ROUT
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