Report
on the Quality of Land Surface Observations
in Region V
July-December 2008
Report No. 24
WMC Melbourne
Lead Centre for Monitoring of the Quality of Land Surface Observations in RA-V
Data Management Section
Communications & Computing Systems Branch
Bureau of Meteorology, Australia
Distrtibution List
| Mr D. Schiessl | Director, World Weather Watch, WMO |
| Dr A.I. Gusev | President CBS |
| Dr E. I. Sarukhanian | WWW Department, WMO |
| Mr S. L. Woon | President of RA V |
| Mr F. Lalaurette | ECMWF |
| Mr I. Gitonga | Kenya Meteorological Department |
| Mr H. Sasaki | Japanese Meteorological Agency |
| Mr A. Rabiolo | Servicio Meteorologico Nacional, Argentina |
| Dr B. Ballish | NCEP, Washington |
| Mr G. Verner | Canadian Meteorological Centre |
| Mr B. Richter | Deutscher Wetterdienst, German |
| Mr H. Benichou | Meteo-France |
| Dr B. Macpherson | UK Meteorological Office |
| Focal Points for Data Quality Monitoring in RA-V | |
For further information or comments on this report please contact:
Data Management Section
Communications & Computing Systems Branch
Bureau of Meteorology
G.P.O. Box 1289K
Melbourne, VIC 3001
Email: stdm@bom.gov.au
- Introduction
Within the Data Management Section of the Bureau of Meteorology lie responsibilities for collecting a full set of meteorological data in real-time from the WMO Global Observing System, and for making such data available to the Analysis-Prognosis models along with some indication as to reliability of report content.
Real-time judgement as to whether a reported element be assimilated by models relies largely on first guess fields, supplemented by observations from any neighbouring stations. Additionally, listings of platforms, which are currently considered suspect, are presented to the Analysis model.
To monitor platform performance, and also to expose likely positional errors, selected reported elements are paired with the
interpolated first-guess value from the global model (6 hour forecast field) and analysed statistically each 6 months in a format which accords with the CBS recommended standards for the exchange of monitoring results. All observations used are unvalidated or "raw" data. This report covers a consolidated list of the suspect stations for the period July-December 2008. The locations of the suspect stations are shown in Figure1 and diagrams of the residuals for each station are in Figures 2-3.
As part of WMO responsibilities as a WMC, copies of this report are made available to major GDPS Centres participating in data monitoring activities.
- Monitoring Methods
The decision as to whether a station is 'suspect' is from determination of the deviations of Mean Sea Level Pressure (MSLP) from the GASP first-guess fields (Observation minus Guess), hereafter called O-G. Deviations are accessed relative to the first guess fields.
To achieve more complete reporting profiles for the investigation of suspect stations, observations were not retrieved for statistical analysis until 24 hours after real-time, thus not all values used in such computations may have been available to the assimilation processing.
The selection criteria for deciding whether a station is suspect or not are as follows:
Number of observations (NOBS) >= 120, and one or more of the following:
1. the mean of O-G |BIAS| >= 3.0 hPa
2. the standard deviation of O-G SD >= 5.0 hPa
3. the percentage of gross errors PGE >= 25%
BIAS and SD are calculated excluding gross error data.
The complete criteria for quality control are given on the header page of Table 2. Stations which exhibited 100% gross errors for the 6 months are included, with asterisks substituted for their poorly defined statistical measures.
- Monitoring Results
Table 1 contains a list of synoptic stations, which are considered to have reported suspect observations of mean sea level pressure (MSLP) during the 6 months.WMO REGION 5 STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS 91434 1.1 154.8 3 ALL MSLP 276 0 0 0.6 3.9 3.9 98132 20.8 121.8 124 ALL MSLP 636 1 0 1.0 4.0 4.1
Table 1. List of land surface stations reporting suspect observations of mean sea level pressure over the period July-December 2008.
Table 2 details a Global coverage of synoptic stations, which are considered to have reported suspect observations of mean sea level pressure (MSLP) during the 6 months.
Table 2
MONITORING OF SURFACE DATA
SUSPECT LIST
MONITORING CENTRE: MELBOURNE
JULY to DECEMBER 2008
*********************
MONITORING PROCEDURES :-
PERIOD : SIX CALENDAR MONTHS
DATA MONITORED : REPORTS FROM EACH UNIQUE IDENTIFIER
FOR SYNOP
AREA : FULL GLOBAL
STANDARD OF COMPARISON : +6H FIRST GUESS FIELD FROM THE AUSTRALIAN GLOBAL
ASSIMILATION PREDICTION (GASP) MODEL
OBSERVATION TIMES : 00, 06, 12, 18 UTC
ELEMENT MONITORED : MSLP - MEAN SEA LEVEL PRESSURE (hPa)
PARAMETERS MONITORED :-
NOBS : NUMBER OF OBSERVATIONS RECEIVED (WITH FIRST
GUESS AVAILABLE) EXCLUDING DUPLICATES
NGE : NUMBER OF OBSERVATIONS WITH GROSS ERRORS
PGE : PERCENTAGE OF OBSERVATIONS WITH GROSS ERRORS
SD : STANDARD DEVIATION OF DIFFERENCE BETWEEN
OBSERVATIONS AND BACKGROUND FIELD
EXCLUDING OBSERVATIONS WITH GROSS ERRORS
BIAS : MEAN OF DIFFERENCE BETWEEN
OBSERVATIONS AND BACKGROUND FIELD
EXCLUDING OBSERVATIONS WITH GROSS ERRORS
RMS : ROOT MEAN SQUARE OF DIFFERENCE BETWEEN
OBSERVATIONS AND BACKGROUND FIELD
EXCLUDING OBSERVATIONS WITH GROSS ERRORS
GROSS ERROR LIMIT : 15.0 hPa
SELECTION CRITERIA : NOBS >= 120 AND ONE OR MORE OF THE FOLLOWING:
1. |BIAS| >= 3.0hPa
2. SD >= 5.0hPa
3. PGE >= 25%
LIST OF SUSPECT LAND SURFACE STATIONS FOR JUL to DEC 2008
-----------------------------------------------------------
WMO REGION 1
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
61257 14.4 -11.4 47 ALL MSLP 137 0 0 1.2 3.0 3.2
61492 16.1 -13.5 18 ALL MSLP 493 1 0 1.9 3.3 3.8
63330 13.5 39.5 2070 ALL MSLP 275 234 85 1.2 13.5 13.5
63331 12.6 37.4 1967 ALL MSLP 224 70 31 1.9 13.1 13.2
63333 11.1 39.7 1903 ALL MSLP 399 1 0 2.6 4.9 5.5
63340 9.1 36.5 2080 ALL MSLP 528 0 0 2.4 7.2 7.6
63402 7.7 36.8 1725 ALL MSLP 159 1 1 2.6 -8.7 9.0
63478 5.9 43.6 295 ALL MSLP 218 0 0 1.1 5.4 5.5
67261 -16.2 33.6 150 ALL MSLP 264 6 2 3.8 -6.6 7.6
WMO REGION 2
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
38599 40.2 69.7 427 ALL MSLP 226 0 0 2.1 3.2 3.8
38944 37.5 69.4 448 ALL MSLP 361 2 1 2.6 -5.9 6.4
40754 35.7 51.3 1191 ALL MSLP 696 0 0 2.5 -3.6 4.4
40757 35.5 53.4 1171 ALL MSLP 644 0 0 2.6 -3.9 4.7
40789 33.8 55.1 921 ALL MSLP 650 0 0 2.3 -3.1 3.8
40791 33.6 56.9 711 ALL MSLP 638 0 0 2.5 -3.3 4.1
40800 32.6 51.7 1590 ALL MSLP 691 0 0 2.8 -3.3 4.3
40818 31.2 52.7 2004 ALL MSLP 646 0 0 3.0 -3.1 4.3
40835 30.4 50.8 738 ALL MSLP 642 2 0 1.7 -3.9 4.2
40854 29.1 58.4 1067 ALL MSLP 641 0 0 2.3 -4.6 5.1
40859 29.0 53.7 1383 ALL MSLP 644 0 0 2.6 -3.8 4.6
44203 51.1 99.7 1583 ALL MSLP 709 23 3 4.1 4.2 5.9
44224 48.8 90.1 1928 ALL MSLP 704 50 7 5.1 2.7 5.8
44225 48.7 98.3 1723 ALL MSLP 722 41 6 4.6 4.0 6.0
44275 46.8 98.1 2255 ALL MSLP 729 6 1 5.4 0.8 5.5
44287 46.1 100.7 1860 ALL MSLP 727 4 1 3.6 3.2 4.8
44302 47.8 112.1 926 ALL MSLP 713 0 0 2.4 3.9 4.6
48968 12.5 104.2 5 ALL MSLP 123 0 0 1.6 4.6 4.9
52652 38.9 100.4 1483 ALL MSLP 735 2 0 3.8 3.2 5.0
56287 30.0 103.0 629 ALL MSLP 736 0 0 2.7 3.2 4.2
WMO REGION 3
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
82287 -2.9 -41.6 22 ALL MSLP 340 0 0 0.7 -4.7 4.8
82353 -3.2 -52.2 74 ALL MSLP 545 0 0 0.9 -3.7 3.8
82704 -7.6 -72.7 170 ALL MSLP 520 0 0 2.0 -4.5 5.0
82861 -8.3 -49.3 157 ALL MSLP 488 0 0 1.4 -3.2 3.5
83264 -12.2 -56.5 415 ALL MSLP 548 0 0 1.3 3.1 3.4
83358 -15.8 -54.4 450 ALL MSLP 548 0 0 2.8 -4.3 5.1
83388 -15.1 -42.8 604 ALL MSLP 349 0 0 1.3 -4.0 4.2
84132 -0.9 -75.4 215 ALL MSLP 150 150 100 ** ** **
84179 -1.5 -77.9 960 ALL MSLP 196 196 100 ** ** **
84202 -2.1 -79.6 13 ALL MSLP 171 0 0 1.8 5.5 5.8
84401 -5.2 -80.6 55 ALL MSLP 594 0 0 1.9 5.9 6.2
84425 -5.9 -76.1 184 ALL MSLP 285 0 0 2.2 3.1 3.8
84455 -6.4 -76.4 282 ALL MSLP 453 1 0 1.9 5.3 5.6
84501 -8.1 -79.0 30 ALL MSLP 587 0 0 1.6 4.7 5.0
84782 -18.1 -70.3 458 ALL MSLP 607 0 0 2.1 3.6 4.2
85210 -16.3 -58.4 124 ALL MSLP 337 0 0 1.1 3.4 3.6
85365 -22.0 -63.7 645 ALL MSLP 314 0 0 4.2 4.6 6.2
85406 -18.4 -70.3 55 ALL MSLP 694 0 0 2.2 4.0 4.6
85574 -33.4 -70.8 474 ALL MSLP 694 0 0 2.3 -3.4 4.1
85577 -33.4 -70.7 520 ALL MSLP 682 0 0 2.4 -3.0 3.9
85836 -43.6 -71.8 277 ALL MSLP 168 3 2 3.2 5.6 6.4
87222 -28.6 -65.8 454 ALL MSLP 611 0 0 2.4 -3.2 4.0
87311 -31.6 -68.4 598 ALL MSLP 711 0 0 3.2 -3.5 4.7
87416 -33.1 -68.4 653 ALL MSLP 528 2 0 2.9 -3.9 4.8
87418 -32.8 -68.8 704 ALL MSLP 701 2 0 3.3 -5.3 6.2
87509 -34.6 -68.4 748 ALL MSLP 711 0 0 2.6 -3.3 4.2
WMO REGION 4
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
71826 66.2 -65.7 32 ALL MSLP 731 0 0 1.8 -3.8 4.1
72375 35.1 -11.2 2139 ALL MSLP 727 37 5 5.6 -2.5 6.1
72462 37.4 -105.9 2299 ALL MSLP 731 1 0 5.4 3.4 6.4
76113 30.7 -111.7 419 ALL MSLP 120 0 0 1.1 -4.1 4.3
76323 26.9 -105.7 1744 ALL MSLP 611 0 0 3.6 3.3 4.9
76680 19.4 -99.2 2303 ALL MSLP 416 0 0 2.1 -4.2 4.7
76848 16.3 -92.1 1646 ALL MSLP 632 0 0 1.8 -3.9 4.3
WMO REGION 5
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
91434 1.1 154.8 3 ALL MSLP 276 0 0 0.6 3.9 3.9
98132 20.8 121.8 124 ALL MSLP 636 1 0 1.0 4.0 4.1
WMO REGION 6
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
37484 41.7 41.6 6 ALL MSLP 150 1 1 1.7 3.3 3.7
37735 40.7 46.4 311 ALL MSLP 557 2 0 1.8 -9.3 9.5
37749 40.7 47.8 95 ALL MSLP 458 1 0 1.9 3.0 3.6
37756 40.5 48.9 755 ALL MSLP 242 1 0 2.2 5.5 5.9
WMO REGION ANTARCTICA
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
89004 -71.7 -2.8 817 ALL MSLP 726 2 0 2.8 -5.1 5.8
89345 -89.7 -148.8 620 ALL MSLP 578 564 98 1.0 -13.8 13.8
89377 -82.5 -174.5 55 ALL MSLP 240 30 13 3.7 8.9 9.6
89504 -72.0 2.5 1290 ALL MSLP 133 1 1 3.4 -4.9 6.0
89512 -70.8 11.8 102 ALL MSLP 730 4 1 3.0 -6.5 7.1
89514 -70.8 11.7 117 ALL MSLP 696 4 1 2.9 -5.8 6.4
89592 -66.6 93.0 35 ALL MSLP 732 1 0 3.2 -5.1 6.0
89611 -66.3 110.5 41 ALL MSLP 735 3 0 3.0 -4.5 5.4
89642 -66.7 140.0 43 ALL MSLP 663 11 2 3.4 -7.5 8.2
89768 -78.6 166.7 920 ALL MSLP 436 4 1 3.3 -3.7 4.9
89864 -74.9 163.7 80 ALL MSLP 563 5 1 3.6 -4.1 5.5
89866 -77.4 163.7 120 ALL MSLP 565 0 0 3.1 -4.3 5.3
89869 -80.0 165.1 75 ALL MSLP 617 2 0 3.2 3.5 4.8
89873 -83.2 174.5 60 ALL MSLP 227 2 1 3.2 -4.8 5.8
89879 -71.9 171.2 30 ALL MSLP 514 51 10 2.3 -10.2 10.5
