Report
on the Quality of Land Surface Observations
in Region V
January-June 2009
Report No. 25
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 January-June 2009. The locations of the suspect stations are shown in Figure1 and diagrams of the residuals for each station are in Figures 2-5.
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 91353 6.2 160.7 4 ALL MSLP 235 0 0 1.9 3.6 4.1 91434 1.1 154.8 3 ALL MSLP 298 0 0 0.9 4.1 4.2 91574 -20.0 158.5 4 ALL MSLP 611 197 32 8.5 -3.1 9.0 98132 20.8 121.8 124 ALL MSLP 607 1 0 1.0 3.5 3.6
Table 1. List of land surface stations reporting suspect observations of mean sea level pressure over the period January-June 2009.
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
JANUARY to JUNE 2009
********************
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 JAN to JUN 2009
-----------------------------------------------------------
WMO REGION 1
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
61230 15.2 -9.4 237 ALL MSLP 658 1 0 1.4 -3.1 3.4
61492 16.1 -13.5 18 ALL MSLP 489 0 0 2.2 3.1 3.8
62760 13.6 25.3 730 ALL MSLP 250 0 0 1.5 -3.3 3.6
62805 11.8 34.4 470 ALL MSLP 517 0 0 1.8 -3.0 3.5
63330 13.5 39.5 2070 ALL MSLP 222 187 84 2.3 13.3 13.5
63331 12.6 37.4 1967 ALL MSLP 213 111 52 1.6 13.1 13.2
63333 11.1 39.7 1903 ALL MSLP 324 0 0 1.9 3.1 3.7
63340 9.1 36.5 2080 ALL MSLP 383 0 0 2.7 7.3 7.8
63402 7.7 36.8 1725 ALL MSLP 123 1 1 2.3 -10.0 10.2
63478 5.9 43.6 295 ALL MSLP 153 0 0 1.4 4.6 4.8
67273 -16.2 39.9 62 ALL MSLP 189 3 2 1.3 -4.4 4.6
WMO REGION 2
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
24688 63.3 143.1 741 ALL MSLP 722 9 1 5.1 1.3 5.3
30650 53.2 112.8 923 ALL MSLP 723 1 0 3.7 -3.0 4.8
31137 56.3 131.1 850 ALL MSLP 719 6 1 4.4 3.1 5.4
38944 37.5 69.4 448 ALL MSLP 676 4 1 2.4 -6.5 7.0
40754 35.7 51.3 1191 ALL MSLP 706 0 0 2.5 -3.8 4.6
40757 35.5 53.4 1171 ALL MSLP 627 0 0 2.4 -3.7 4.4
40789 33.8 55.1 921 ALL MSLP 639 0 0 2.3 -3.1 3.9
40800 32.6 51.7 1590 ALL MSLP 703 1 0 2.8 -3.7 4.6
40818 31.2 52.7 2004 ALL MSLP 638 0 0 3.0 -3.2 4.3
40835 30.4 50.8 738 ALL MSLP 632 0 0 1.7 -3.5 3.9
40854 29.1 58.4 1067 ALL MSLP 636 0 0 2.4 -4.6 5.1
40859 29.0 53.7 1383 ALL MSLP 639 0 0 2.4 -3.1 3.9
41530 34.0 71.6 360 ALL MSLP 663 2 0 2.9 -3.0 4.2
42111 30.3 78.0 682 ALL MSLP 704 0 0 2.7 -3.1 4.1
44203 51.1 99.7 1583 ALL MSLP 717 15 2 5.2 3.0 6.0
44207 50.4 100.2 1687 ALL MSLP 721 4 1 5.2 1.9 5.6
44212 49.8 92.1 936 ALL MSLP 723 132 18 5.5 4.1 6.9
44213 49.7 94.4 1232 ALL MSLP 720 95 13 5.3 4.5 7.0
44218 48.0 91.7 1406 ALL MSLP 720 26 4 5.4 -1.1 5.5
44224 48.8 90.1 1928 ALL MSLP 708 57 8 5.5 2.6 6.0
44225 48.7 98.3 1723 ALL MSLP 717 77 11 5.3 3.2 6.2
44275 46.8 98.1 2255 ALL MSLP 720 10 1 6.1 -0.0 6.1
44277 46.4 96.3 2147 ALL MSLP 720 32 4 4.7 4.0 6.1
44284 46.7 100.1 2117 ALL MSLP 715 27 4 4.9 4.6 6.7
44285 46.9 102.8 1655 ALL MSLP 721 3 0 4.7 3.2 5.7
44287 46.1 100.7 1860 ALL MSLP 720 2 0 3.7 3.2 4.9
44302 47.8 112.1 926 ALL MSLP 699 1 0 2.7 3.1 4.1
44416 28.6 81.6 720 ALL MSLP 246 1 0 4.7 -3.8 6.0
47075 38.4 127.3 371 ALL MSLP 652 4 1 3.6 -7.2 8.1
51379 44.0 89.6 794 ALL MSLP 699 0 0 3.2 3.2 4.5
51709 39.5 76.0 1291 ALL MSLP 722 1 0 4.1 -4.1 5.8
51828 37.1 79.9 1375 ALL MSLP 722 2 0 4.4 -3.0 5.3
56287 30.0 103.0 629 ALL MSLP 722 0 0 3.3 3.9 5.1
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 334 0 0 0.7 -3.5 3.6
82353 -3.2 -52.2 74 ALL MSLP 507 0 0 1.2 -3.2 3.4
82704 -7.6 -72.7 170 ALL MSLP 515 0 0 1.9 -3.5 3.9
82765 -7.3 -47.5 193 ALL MSLP 462 0 0 1.2 3.3 3.5
82789 -7.8 -38.1 1020 ALL MSLP 257 0 0 1.5 -7.4 7.5
83264 -12.2 -56.5 415 ALL MSLP 533 2 0 1.1 3.3 3.5
83319 -14.7 -52.3 315 ALL MSLP 525 0 0 1.2 3.0 3.3
83388 -15.1 -42.8 604 ALL MSLP 379 0 0 1.4 -3.5 3.8
84179 -1.5 -77.9 960 ALL MSLP 130 130 100 ** ** **
84401 -5.2 -80.6 55 ALL MSLP 465 0 0 2.0 4.6 5.0
84425 -5.9 -76.1 184 ALL MSLP 202 0 0 2.2 3.7 4.3
84455 -6.4 -76.4 282 ALL MSLP 370 0 0 2.1 5.6 5.9
84501 -8.1 -79.0 30 ALL MSLP 464 0 0 1.5 3.5 3.8
85836 -43.6 -71.8 277 ALL MSLP 133 2 2 3.0 5.3 6.1
87418 -32.8 -68.8 704 ALL MSLP 685 0 0 3.1 -3.1 4.4
88986 -59.5 -27.3 27 ALL MSLP 458 244 53 6.2 3.4 7.0
WMO REGION 4
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
71094 66.6 -61.6 393 ALL MSLP 713 0 0 1.9 -4.0 4.5
71177 57.1 -61.5 834 ALL MSLP 719 0 0 3.2 -3.7 4.9
71826 66.2 -65.7 32 ALL MSLP 353 0 0 2.0 -4.3 4.7
72370 35.3 -113.9 1033 ALL MSLP 687 0 0 2.6 -3.2 4.1
72375 35.1 -11.2 2139 ALL MSLP 718 52 7 5.9 -3.2 6.7
72462 37.4 -105.9 2299 ALL MSLP 723 0 0 5.8 -1.5 6.0
72464 38.3 -104.5 1439 ALL MSLP 714 0 0 5.1 -3.8 6.3
72476 39.1 -108.5 1475 ALL MSLP 717 1 0 4.3 -4.0 5.9
72565 39.9 -104.7 1656 ALL MSLP 719 1 0 5.0 -3.7 6.2
72672 43.1 -108.5 1703 ALL MSLP 713 0 0 4.3 -3.2 5.4
76113 30.7 -111.7 419 ALL MSLP 212 0 0 1.8 -4.7 5.0
76225 28.6 -106.1 1435 ALL MSLP 580 1 0 3.8 -3.6 5.3
76382 25.5 -103.4 1124 ALL MSLP 658 1 0 5.3 -3.0 6.1
76525 22.8 -102.6 2612 ALL MSLP 476 1 0 5.1 -2.6 5.7
76625 20.6 -100.4 1813 ALL MSLP 446 0 0 4.6 -4.1 6.1
76680 19.4 -99.2 2303 ALL MSLP 411 1 0 2.6 -6.3 6.8
76685 19.0 -98.2 2179 ALL MSLP 508 0 0 4.0 -3.5 5.3
76726 18.9 -99.2 1618 ALL MSLP 343 2 1 4.0 -4.1 5.7
76762 17.5 -99.5 1865 ALL MSLP 557 0 0 1.8 -3.0 3.5
76833 16.2 -95.2 6 ALL MSLP 139 15 11 6.7 -0.3 6.7
76848 16.3 -92.1 1646 ALL MSLP 635 0 0 2.0 -4.7 5.1
WMO REGION 5
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
91353 6.2 160.7 4 ALL MSLP 235 0 0 1.9 3.6 4.1
91434 1.1 154.8 3 ALL MSLP 298 0 0 0.9 4.1 4.2
91574 -20.0 158.5 4 ALL MSLP 611 197 32 8.5 -3.1 9.0
98132 20.8 121.8 124 ALL MSLP 607 1 0 1.0 3.5 3.6
WMO REGION 6
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
37735 40.7 46.4 311 ALL MSLP 539 3 1 2.5 -9.2 9.5
37749 40.7 47.8 95 ALL MSLP 514 0 0 2.2 3.5 4.1
37756 40.5 48.9 755 ALL MSLP 478 2 0 1.9 5.1 5.5
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 695 1 0 2.5 -4.8 5.4
89272 -75.0 -70.8 1395 ALL MSLP 645 561 87 2.3 -12.6 12.8
89345 -89.7 -148.8 620 ALL MSLP 647 627 97 0.9 -14.1 14.1
89377 -82.5 -174.5 55 ALL MSLP 533 21 4 3.5 8.1 8.8
89512 -70.8 11.8 102 ALL MSLP 597 0 0 2.6 -6.5 7.0
89514 -70.8 11.7 117 ALL MSLP 649 3 0 2.8 -5.8 6.4
89592 -66.6 93.0 35 ALL MSLP 670 2 0 2.7 -5.0 5.6
89611 -66.3 110.5 41 ALL MSLP 723 6 1 2.6 -4.7 5.4
89642 -66.7 140.0 43 ALL MSLP 638 13 2 3.3 -7.1 7.8
89667 -78.0 166.5 10 ALL MSLP 298 278 93 3.9 -3.3 5.0
89768 -78.6 166.7 920 ALL MSLP 644 2 0 3.2 -3.8 5.0
89832 -66.7 139.8 243 ALL MSLP 482 135 28 2.4 -11.3 11.6
89864 -74.9 163.7 80 ALL MSLP 641 1 0 3.6 -3.4 5.0
89865 -76.1 168.4 274 ALL MSLP 210 130 62 6.4 4.9 8.0
89879 -71.9 171.2 30 ALL MSLP 620 55 9 2.2 -10.6 10.8
