Product User Manual for the "Air Mass Analysis" product
Contents
1. PROGRAM SAFNWC AMA BUFR PARAMETER JSECO 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 DIMENSION KSECO JSECO KSEC1 JSEC1 KSEC2 JSEC2 KSEC3 JSEC3 DIMENSION KSEC4 JSEC4 ifndef R_4 else REAL 8 VALUES KVALS1 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 CGBNAMEINTRO SAFNWC MSG1 AMA 00160 024 Region ZAMG N 2GETENV SAFNWC EXPORT PATH EXPORT_PATH EXPORT_PATH 1 INDEX EXPORT_PATH 1 export PGE12 INDEXPO INDEX EXPORT PATH 1 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 MAGICS 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 CALL PSETR SUPER PAGE Y LENGTH 24 0 CALL PSETR P2. 3 IMPLEMENTATION OF AIR MASS ANALYSIS AMA AMA is extracted by PGEI2 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 configuration 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 SSAFNWC config Algorithm configuration files are situated in the directory SSAFNWC 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 SAJ input which is the output of PGE08 of the SAFNWC MSG SAI data matching slot and region have to be made available in the directory SAFNWC export PGE08 For produc
3. Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 A NS i Page 1 25 NWC SAF ZAMG Product User Manual for the Air Mass Analysis product AMA PGE12 v2 1 SAF NWC CDOP ZAMG SCI PUM 12 Issue 2 Rev 1 1 8 September 2009 Applicable to SAFNWC MSG version 2010 The EUMETSAT Network of Satellite Application Facilities Support to Nowcasting and Very Short Range Forecasting Prepared by ZAMG Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 A Page 2 25 NWC SAF ZAMG REPORT SIGNATURE TABLE Prepared by ZAMG 8 September 2009 Reviewed by ZAMG 8 September 2009 Pilar Fern ndez Authorised by SAFNWC Project 8 September 2009 Manager Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 LA ak Page 3 25 NWC SAF ZAMG DOCUMENT CHANGE RECORD CHANGE S 16 September 2007 Initial version content derived from various precursor documents on PGEI2 most notably Software User Manual for the SAFNWC MSG Scientific part for the PGE12 23 February 2009 Update for t
4. SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 ta ak i Page 8 25 NWC SAF ZAM e Title RD 1 Scientific report on Validation and Tuning of SAF NWC IOP ZAMG SCI VAL 1 1 0 19 08 05 MSG PGE12 RD 2 Ee N A Table 2 List of Referenced Documents Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 A Page 9 25 NWC SAF ZAMG 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 function 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
5. 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 a result 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 the 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
6. 14 25 NWC SAF ZAMG Ensure that all required input data are available in their respective directories and that pre requirements listed under items 1 8 are fulfilled PGE12 can be called as follows from the directory where it is situated JPGE12 YYYYMMDDhhmm region configuration file model configuration file Example PGE12 200303281145 myregion cfg safnwc pgel2 cfm Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 7 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12_v2 1 1 A Page 15 25 NWC SAF ZAMG 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 Stability analysis imagery SAT which is the output of PGE08 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 t
7. 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 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 0O 0O 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 SUBPAGE Y POSITION 1 05 CALL PSETR SUBPAGE X LENGTH 22 41 CALL PSETR SUBPAGE Y LENGTH 17 85 C CPANEL i TETEE i LT C DECODE BUFR FILE CONTAINING THE SAFNWC AMA DARK STRIPE OF C WATER VAPOUR IMAGE PRODUC
8. Ridge buf r IRET IF IRET NE 0 GOTO 13 KERR 0 IRET 0 KBUFL 0 11 CONTINUE C 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 c 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 PLOT THE z pel IDGE LI Lr Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 EA Analysis product AMA PGE12 v2 1 H ved SAF NWC CDOP ZAMG SCLP E NWC SAF ZAMG 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
9. DUE GR GE N 10 2 2 3 Ridgeline productaleorithin OUN EE EE AA AEA 10 2 2 4 tovg doncc eb N QV Q 10 2 3 DESCRIPTION OF AIR MASS ANALYSIS AMA OUTPUTS cessere eene nnn 10 3 IMPLEMENTATION OF AIR MASS ANALYSIS AMA cerne eren esse es sees sees sees 13 4 INPUTS AND CONFIGURABLE PARAMETERS FOR AIR MASS ANALYSIS AMA on N OE E E 15 4 1 LIS TOF INPUTS e EE da ade 15 4 1 1 Air mass classification PTODUCL OR tn 15 4 1 2 WV dark DEDE DEDE npn pp Dupin pnm aa imp 15 4 1 3 Ridge Une prodl NH 15 4 1 4 Gradient zone of equivalent potential temperature product eese LS 4 2 CONFIGURABLE PARAMETERS FOR AIR MASS ANALYSIS AMA ccccccsssseseeestseeesseeeeseeeees 15 5 AIR MASS ANALYSIS AMA VALIDATION eese eene eene eene Ge Ge Ge Ge Ge 17 34 SUMMARY OF AIR MASS ANALYSIS AMA VALIDATION RESULTS esse esse esse ee sees ee ee se ee ee 17 5 2 TYPICAL KNOWN PROBLEMS AND RECOMMENDATION FOR USE iese sesse ee esse ee ese ee ee ee ee see es 17 6 EXAMPLES OF AIR MASS ANALYSIS AMA VISUALISATION ees seeessee see esse esse 18 Te io di eo reina ibd d rii rk nido eodon norton 25 Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 A NETS Page 5 25 NWC SAF ZAMG List of Tables and Figures Tabl
10. UTC unclassified cloudy pixels appearing in black Prevailing on the display is tropical continental and polar continental air see attached colour legend optional SAI 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 NWC SAF ZAMG Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass D 2 1 1 Date 8 September 2009 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 ZA Page 20 25 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 CC OO Te THIS IS A DEMO BUFR DECODING ROUTINE FOR LONGITUDE LATITUDI INFORMATION SUBMITTED BY SAFNWC AMA ROUTINES AUTHOR ALEXANDER JANN ZAMG VIENNA AUSTRIA CREATION DATE 13 07 2001 THIS IS INTENDED TO REPRESENT A USEFUL SUPPORT TO USERS OF THE SAFNWC MSG SOFTWARE PACKAGE BUT COMES WITHOUT WARRANTY OF ANY KIND
11. 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 45 120 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 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 Analysis product AMA PGEI2 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 Page 19 25 MSG SAFNWC 20071118 09 15 Air Mass Analysis equatorial maritime unstable E equatorial continental unstable tropical maritime unstable d tropical eontinentalf unstable polar maritime unstable polar continental unstable arctic maritime unstable arctic centinental unstable equaterial maritime stable equatorial continental stable tropical maritime stable tropical continental stable polar maritime stable polar continental 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
12. 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 i 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 The output files contain as many BUFR records as there are identified black stripes or ridge lines respectively 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 internal 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 NWC SAF ZAMG Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 A Page 13 23
13. AGE X LENGTH 29 7 CALL PSETR PAGE Y LENGTH 24 0 Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 Analysis product AMA PGEI2 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 A SS ae 2105 g NWC SAF ZAMG CALL PSETC CALL ESEDC CALL PSETR CALL PSETR SUBPAGE MAP PROJECTION POLAR STEREOGRAPHIC SUBPAGE MAP AREA DEFINITION CORNERS SUBPAGE MAP VERTICAL LONGITUDE 0 0 SUBPAGE LOWER LEFT LONGITUDE 29 5 D 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 SUBPAGE Y POSITION 1 05 CALL PSETR SUBPAGE X LENGTH 22 41 CALL PSETR SUBPAGE Y LENGTH 17 85 KEETE OE EE RD bed a AE MR N l3 d E E Eod od de eoo Mo bo e b poe dod Tob de Eo do d eT DECODE BUFR FILE CONTAINING THE SAFNWC AMA RIDGE LINE OF EQUIVALENT POTENTIAL TEMPERATURE PRODUCT HR qud EE EER DOEKE DEE DR OE K OE RED TONE CrtrgdgwutrdgyqTddrttrttktgdqgbdgtg ridi T C20 C02 IRET 0 CALL PBOPEN IUNIT EXPORT PATH 1 INDEXPO CGBNAMEINTRO 1 INDEX CGBNAMEINTRO T
14. C SAF ZAMG 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 equivalent 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 Product 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 us Product id 6 Name of sub product variable Name of
15. 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 2010 SAFNWC MSG software package delivery 1 4 IMPROVEMENT FROM PREVIOUS VERSION Minor technical updates to be compliant with the most recent NWCLIB data type definitions 1 5 DEFINITIONS ACRONYMS AND ABBREVIATIONS AMA Air Mass Analysis cfm PGE12 model configuration file nominally at SAFNWC config safnwc pgel2 cfm ECMWF European Centre for Medium range Weather Forecasts EUMETSAT European Organisation for the Exploitation of Meteorological Satellites GEOS Geostationary HDF Hierarchical data Format Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass 2 1 1 Date 8 September 2009 ZZ Analysis product AMA PGE12 v2 1 a SAF NWC CDOP ZAMG SCI PUM m NWC SAF ZAMG HRIT High Rate Information Transmission IR Infrared LAM Limited Area Model MSG Meteosat Second Generation NWP Numerical Weather Prediction PGE Product Generation Element QC Quality Control SAF Satellite Application Facility SAFNWC SAF to support NoW Casting and Very Short Range Forecasting SAI Stability Analysis Imagery SEVIRI Spinning Enhanced Visible amp Infrared Imager SUM Software User Manual TPW Total Precipitable Water WV Water Vapour 1 6 REFERENCES 1 6 1 Applicable Documents For dated refe
16. T C COUTET ere rer er ere rere rere rer ere ERA OE RARR KG AS 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 1 Date 8 September 2009 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 A POSSE ue 2305 g NWC SAF ZAMG CGBNAMEINTRO 1 INDEX CGBNAMEINTRO WVstripe buf r 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 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 ME
17. THOD 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 PCLOSE Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 7 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 A Page 24 25 NWC SAF ZAMG END Product User Manual for the Air Mass Analysis product AMA PGE12 v2 1 NWC SAF ZAMG Code SAF NWC CDOP ZAMG SCI PUM 12 Issue 2 1 1 Date 8 September 2009 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 Page 25 25 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 recognition approach for the detection of ridge lines and stripes Meteorol Appl 9 357 365 Mart n F Elizaga F and Riosalido R 1999 The mushroom configuration in water vapour imagery and operational applications Meteoro
18. e 1 List ot Applicable DOGTERS EERS RE ESEG EE RE ED aerae raet ah eases DO 7 Table 2 List of Referenced DOOIES se EERDER EER EER EDE DE Rees Ee sb De 8 Table 3 File name components of AMA BUFR outPU ees esse sesse ee ee Re ee Re ee ee 12 Figure 1 Ridge line detection for an eguivalent 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 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 SAI TACIUSION WOS TUITIEN Off EA AE OE EE EE EE 19 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 Ut SECVRCO Os ee A a i ee 19 Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 A Page 6 25 NWC SAF ZAMG 1 INTRODUCTION The Eumetsat Satellite Application Facilities SAF are dedicated centres of excellence for processing satellite data and form an integral part of th
19. e 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 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
20. emperature 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 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 fi
21. ereby LAM output became permissible as input on the other hand this means that the Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 A Page 16 25 NWC SAF ZAMG 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 1 Date 8 September 2009 YAS Analysis product AMA PGEI2 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 A Page 17 25 NWC SAF ZAMG 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 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
22. eserved for future use Equatorial maritime unstable id gt 5 E 5 s 2 re 1 E Equatorial continental stable Equatorial reserved for future use 3 EJ 3 E L 2 C e 3 7 gt Code o 6 Lm s 9 i0 u 2 3 Er aal 5 16 7 18 9 20 7 10 11 12 13 14 15 16 17 18 19 20 1 The parameter AMA QUALITY has a range of 0 4 with the folowing meanings no QC possible because pixel cloudy in at least EES GN EN 1 no change in thermal category i e arctic polar tropical or equatorial and moisture category maritime vs continental between current and previous slot Note that this parameter may be missing in the HDF output file namely if there is no precursor product in which case the impossibility of a quality check is also verbally reported in the log files The gradient zone product has 128 different count values with the following meaning Code 10 _ 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 Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 7 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 A Page 12 25 NW
23. 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 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 these 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 a
24. he SAFNWC MSG application e SEVIRI IR imagery channel 13 4 e SAFNWC MSG product Cloud mask which is the output of PGE01 of the SAFNWC 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 PGEI2 which at present is ZAMG Possible Value s INCORPORATE SAI Decide whether the NWCSAF SAI product should chain of characters YES or NO be incorporated in the AMA air mass classification process RL MinLength The minimum length in terms of NWP grid points integer all yet values lt 2 a ridge line has to have in order to appear in the are set to 2 output internally RL MinAbsCurvature The minimum anticyclonic curvature an extremum float all yet values 0 has to have in order to be eligible as a starting are set to 0 point of a ridge line tracking internally The first entry is 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 SSAFNWC import NWP data as it is and analyzes ridge lines on the NWP grid Th
25. he SAFNWC MSG release 2009 mainly on new quality flag 8 September 2009 Minor mainly editorial updates for the SAFNWC MSG release 2010 No scientific updates Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 LA Page 4 25 NWC SAF ZAMG Table of contents 1 INTRODUCTION 6 1 1 SCOPE OF AN ie Ee di HE AE AO ODER RODEO EE EE 6 12 B DORB OF OTHER DOCUNIENTS vie theta ia roiaioanbetninisbeipinbstelaeetebelchcashstobcapiatelessinissteeisisuniaaeiabaan 6 1 3 SOFTWARE VERSION IDENTIFICATION si es es Ge RR Ski EA se AR R oe ee AG Re 6 1 4 IMPROVEMENT FROM PREVIOUS VERSION wey us ese see SR ee e nh Bee exea EEN SE Ree e gage Feux e We Bes ee en 6 1 5 DEFINITIONS ACRONYMS AND ABBREVIATIONS s ssssccsecosssosecssesctecesescessesesscssesesssesessovsenecoss 6 Le REP ER oe tonc 7 1 6 1 Ee OR EE EE OE EE EE OOO 7 1 6 2 Reference Doc meniS REEN EE EE ME OE EE ER 7 2 DESCRIPTION OF THE AIR MASS ANALYSIS AMA PRODUCTS 9 2 1 GOAL OF THE AIR MASS ANALYSIS AMA PRODUCTS esse esse ee ese see se ee ee in ee ee ee ee 9 22 OUTLINE OF AIR MASS ANALYSIS AMA ALGORITHMS cessere nennen enne 9 2 2 1 Air mass classification algorithm outline T 9 2 2 2 WV dark stripe detection algorithm outline iss ED REEKS DEEG DER DER
26. 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 m7 Product User Manual for the Air Mass sa 2 1 1 Date 8 September 2009 e Analysis product AMA PGE12 v2 1 ile SAF NWC CDOP ZAMG SCI PUM 12 2 1 1 Lowe A Page 18 25 NWC SAF ZAM e 6 EXAMPLES OF AIR MASS ANALYSIS AMA VISUALISATION Figure 1 shows the visualization of the BUFR products WV
27. ing the products based 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 SSAFNWC import SEVIRI data Make sure that the environment variable SAFNWC is set The environment variables SBUFR TABLES and LOCAL DEFINITION TEMPLATES need also be set as SAFNWC src bufr_000360 bufrtables and S SAFNWC src gribex 000360 gribtemplates respectively Make sure that the following supplementary files are available a SAFNWC src bufr_000360 bufrtables B0000000000098002001 TXT b SSAFNWC 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 Then the processing of PGEI2 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 Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass Issue 2 1 1 Date 8 September 2009 Analysis product AMA PGE12 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 A ud m T Page
28. l 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
29. pplied 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 1 1 Date 8 September 2009 VHA Analysis product AMA PGEI2 v2 1 File SAF NWC CDOP ZAMG SCI PUM 12 v2 1 1 A Page 10 25 NWC SAF ZAMG 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 whether the pixel is dark enough to be eligible i e 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 t
30. rences 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 reference 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 Latest documentation can be found at the SAFNWC Help Desk at http www nwcsaf org Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass 2 1 1 Date 8 September 2009 Analysis product AMA PGE12 v2 1 ile
31. rst 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 PGEI2 of SAFNWC MSG release v2010 is 9 or 17 depending on whether the user turns the SAI inclusion option off or on 8 Code SAF NWC CDOP ZAMG SCI PUM 12 Product User Manual for the Air Mass 2 1 1 Date 8 September 2009 Analysis product AMA PGE12 v2 1 ile SAF NWC CDOP ZAMG SCI PUM 12_v2 1 1 ta Page 11 25 NWC SAF ZAMG placeholders for possible future use with the following coding if SAI inclusion is not selected or the SAI product is missing the lower numbers are selected and classes 13 to 24 do not appear Code Tropical reserved for future use is s ropal reserved for future use a 21 Tropical maritime unstable Equatorial r
Download Pdf Manuals
Related Search