Report
on the Quality of Land Surface Observations
in Region V
January
to June 2004
Report No. 15
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 to June 2004. The locations of the suspect stations are shown in Figure1 and diagrams of the residuals for each of 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 96753 -6.5 106.8 250 ALL MSLP 239 1 0 2.2 4.4 5.0 96947 -8.0 112.7 526 ALL MSLP 130 0 0 1.2 3.7 3.9 97012 1.5 124.9 67 ALL MSLP 453 0 0 2.2 -5.0 5.5 97378 -10.7 123.1 1 ALL MSLP 231 188 81 3.0 -13.6 14.0
Table 1. List of land surface stations reporting suspect observations of mean sea level pressure over the period January to June 2004.
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 2004
********************
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 2004
-----------------------------------------------------------
WMO REGION 1
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
61492 16.1 -13.5 18 ALL MSLP 423 0 0 1.5 3.6 3.9
62271 24.2 23.3 436 ALL MSLP 323 0 0 1.7 3.7 4.1
63330 13.5 39.5 2070 ALL MSLP 170 69 41 2.2 11.8 12.0
63333 11.1 39.7 1903 ALL MSLP 175 1 1 1.7 5.1 5.4
63478 5.9 43.6 295 ALL MSLP 154 0 0 2.2 5.4 5.9
64656 4.7 22.8 500 ALL MSLP 308 0 0 1.7 3.3 3.7
65416 9.0 -2.5 301 ALL MSLP 220 0 0 1.6 3.4 3.8
65418 9.5 -0.9 173 ALL MSLP 319 0 0 1.4 4.0 4.2
67241 -15.0 40.7 11 ALL MSLP 271 0 0 1.7 -3.4 3.8
68106 -23.6 15.1 400 ALL MSLP 174 8 5 3.4 -4.2 5.4
68674 -31.6 29.5 47 ALL MSLP 155 2 1 3.3 4.9 5.9
68903 -37.0 -12.3 51 ALL MSLP 366 101 28 6.6 5.9 8.9
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 718 94 13 5.5 2.6 6.1
31137 56.3 131.1 850 ALL MSLP 675 1 0 5.2 2.7 5.9
36859 44.2 80.1 645 ALL MSLP 723 0 0 2.7 -3.2 4.2
40700 39.7 48.1 45 ALL MSLP 679 1 0 1.8 -4.0 4.4
40726 36.8 45.7 1385 ALL MSLP 655 0 0 2.2 3.7 4.3
40741 36.5 61.2 236 ALL MSLP 662 0 0 2.4 -3.9 4.6
40836 30.8 51.7 1880 ALL MSLP 665 0 0 2.3 3.7 4.3
44212 49.8 92.1 936 ALL MSLP 707 155 22 5.2 3.3 6.1
44213 49.7 94.4 1232 ALL MSLP 707 119 17 5.2 3.0 6.0
44214 49.0 90.0 1714 ALL MSLP 695 17 2 5.1 -2.2 5.5
44215 49.1 91.7 1591 ALL MSLP 706 52 7 5.2 0.0 5.2
44218 48.0 91.7 1406 ALL MSLP 711 53 7 5.6 0.6 5.6
44224 48.8 90.1 1928 ALL MSLP 663 111 17 6.6 0.5 6.6
44225 48.7 98.3 1723 ALL MSLP 714 148 21 5.2 2.0 5.6
44265 46.1 91.6 1186 ALL MSLP 700 92 13 5.2 5.0 7.2
44272 47.8 96.8 1753 ALL MSLP 712 19 3 6.2 -0.3 6.2
44275 46.8 98.1 2255 ALL MSLP 704 80 11 5.3 1.3 5.5
44277 46.4 96.3 2147 ALL MSLP 719 3 0 5.3 -1.1 5.4
44284 46.7 100.1 2117 ALL MSLP 713 103 14 5.0 3.9 6.3
44336 45.5 103.9 1316 ALL MSLP 683 13 2 4.0 3.3 5.2
48952 15.7 106.4 168 ALL MSLP 263 0 0 1.5 -3.6 3.9
48957 14.8 106.8 105 ALL MSLP 131 0 0 1.4 3.5 3.8
51076 47.7 88.1 737 ALL MSLP 728 0 0 3.5 3.1 4.6
51087 47.0 89.5 827 ALL MSLP 727 2 0 4.1 3.5 5.4
51334 44.6 82.9 321 ALL MSLP 716 0 0 3.6 3.7 5.2
51379 44.0 89.6 794 ALL MSLP 720 0 0 4.0 3.7 5.4
51495 43.2 91.7 732 ALL MSLP 719 58 8 5.8 1.0 5.9
51709 39.5 76.0 1291 ALL MSLP 728 1 0 5.1 0.3 5.1
51730 40.5 81.1 1013 ALL MSLP 715 7 1 3.9 -3.1 5.0
51747 39.0 83.7 1099 ALL MSLP 728 9 1 5.2 -1.7 5.5
51777 39.0 88.2 889 ALL MSLP 728 3 0 5.2 -3.0 6.0
53192 44.0 114.9 1128 ALL MSLP 728 0 0 2.4 3.3 4.1
53391 41.9 114.0 1484 ALL MSLP 726 2 0 2.2 3.0 3.7
53480 41.0 113.1 1416 ALL MSLP 719 0 0 2.2 3.3 3.9
56287 30.0 103.0 629 ALL MSLP 728 0 0 1.8 3.5 3.9
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
80398 -4.2 -69.9 84 ALL MSLP 195 0 0 1.4 5.8 6.0
82212 -2.5 -66.2 55 ALL MSLP 500 0 0 2.2 4.4 4.9
82287 -2.9 -41.6 22 ALL MSLP 535 0 0 1.0 -3.7 3.8
82353 -3.2 -52.2 74 ALL MSLP 519 0 0 1.4 -3.6 3.8
82425 -4.1 -63.1 46 ALL MSLP 425 0 0 1.6 3.9 4.2
82445 -4.3 -55.6 45 ALL MSLP 528 0 0 1.7 3.2 3.7
82586 -5.2 -39.3 212 ALL MSLP 534 0 0 1.7 -3.7 4.1
82861 -8.3 -49.3 157 ALL MSLP 524 0 0 1.7 -3.1 3.5
83319 -14.7 -52.3 315 ALL MSLP 524 1 0 1.2 5.0 5.1
83726 -22.0 -47.9 856 ALL MSLP 504 3 1 1.7 3.3 3.7
83738 -22.5 -44.5 440 ALL MSLP 414 244 59 0.9 -13.9 14.0
84377 -3.8 -73.3 126 ALL MSLP 611 0 0 1.4 3.5 3.8
84390 -4.6 -81.3 90 ALL MSLP 124 0 0 1.3 4.7 4.9
84401 -5.2 -80.6 55 ALL MSLP 628 1 0 1.5 4.8 5.0
84425 -5.9 -76.1 184 ALL MSLP 131 0 0 1.5 8.2 8.4
84452 -6.8 -79.8 34 ALL MSLP 609 0 0 1.6 3.8 4.1
84455 -6.4 -76.4 282 ALL MSLP 451 7 2 2.2 9.6 9.8
84501 -8.1 -79.0 30 ALL MSLP 445 0 0 1.8 4.9 5.2
84531 -9.2 -78.5 21 ALL MSLP 123 0 0 1.4 3.0 3.3
84720 -14.9 -74.9 567 ALL MSLP 292 0 0 1.7 6.0 6.2
84773 -17.7 -71.3 9 ALL MSLP 124 0 0 1.5 3.7 4.0
84782 -18.1 -70.3 458 ALL MSLP 506 0 0 1.9 7.3 7.5
85041 -11.0 -68.8 235 ALL MSLP 338 1 0 2.2 7.4 7.7
85210 -16.3 -58.4 124 ALL MSLP 347 0 0 1.5 3.5 3.8
85268 -18.3 -59.8 276 ALL MSLP 341 0 0 1.3 3.2 3.5
85365 -22.0 -63.7 645 ALL MSLP 335 0 0 2.9 3.5 4.6
85394 -22.8 -64.3 381 ALL MSLP 260 1 0 3.1 3.6 4.7
85406 -18.4 -70.3 55 ALL MSLP 706 1 0 1.9 5.0 5.3
85418 -20.5 -70.2 48 ALL MSLP 705 0 0 1.8 3.8 4.2
85442 -23.4 -70.4 140 ALL MSLP 716 0 0 1.9 3.0 3.6
86011 -19.5 -59.4 150 ALL MSLP 490 0 0 1.8 3.0 3.5
WMO REGION 4
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
71020 61.2 -123.7 204 ALL MSLP 246 0 0 1.7 -3.0 3.5
71023 65.9 -89.4 18 ALL MSLP 726 145 20 7.8 0.2 7.8
71060 65.6 -118.1 230 ALL MSLP 719 111 15 6.9 -3.5 7.7
71094 66.6 -61.6 393 ALL MSLP 698 0 0 2.4 -3.5 4.3
71421 51.9 -63.3 589 ALL MSLP 442 0 0 2.0 3.6 4.1
71506 67.0 -136.2 720 ALL MSLP 711 0 0 2.5 -4.8 5.4
71571 55.7 -119.2 1015 ALL MSLP 334 0 0 2.1 -3.5 4.0
71619 48.0 -65.3 47 ALL MSLP 680 476 70 3.5 -1.4 3.8
72375 35.1 -11.2 2139 ALL MSLP 702 61 9 6.0 -3.4 6.9
72462 37.4 -105.9 2299 ALL MSLP 713 8 1 4.3 3.7 5.7
72570 40.5 -107.5 1915 ALL MSLP 703 0 0 3.8 4.0 5.5
76220 29.0 -107.8 1932 ALL MSLP 233 36 15 3.8 9.6 10.3
76225 28.6 -106.1 1435 ALL MSLP 451 5 1 4.8 -4.0 6.2
76323 26.9 -105.7 1661 ALL MSLP 455 2 0 4.2 4.6 6.3
76625 20.6 -100.4 1880 ALL MSLP 180 0 0 3.1 -4.0 5.0
76634 20.1 -98.4 2181 ALL MSLP 161 0 0 2.5 5.0 5.6
76658 19.2 -103.7 494 ALL MSLP 142 0 0 1.2 5.1 5.3
76687 19.5 -96.9 1389 ALL MSLP 498 0 0 1.8 4.1 4.5
76762 17.5 -99.5 1265 ALL MSLP 323 0 0 2.1 3.5 4.1
76773 17.8 -97.8 1680 ALL MSLP 142 0 0 4.0 6.1 7.3
76843 16.8 -93.1 528 ALL MSLP 327 0 0 2.7 4.7 5.4
76848 16.3 -92.1 1646 ALL MSLP 308 0 0 1.7 -3.5 3.9
76903 14.9 -92.3 118 ALL MSLP 345 0 0 3.1 3.4 4.6
78588 17.2 -87.5 1 ALL MSLP 720 694 96 1.0 0.1 1.0
78718 14.4 -89.2 626 ALL MSLP 347 0 0 1.6 -3.1 3.5
WMO REGION 5
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
96753 -6.5 106.8 250 ALL MSLP 239 1 0 2.2 4.4 5.0
96947 -8.0 112.7 526 ALL MSLP 130 0 0 1.2 3.7 3.9
97012 1.5 124.9 67 ALL MSLP 453 0 0 2.2 -5.0 5.5
97378 -10.7 123.1 1 ALL MSLP 231 188 81 3.0 -13.6 14.0
WMO REGION 6
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
01389 61.2 11.4 240 ALL MSLP 370 95 26 1.6 -0.6 1.7
17042 41.4 41.4 33 ALL MSLP 670 1 0 3.5 3.2 4.7
40296 31.0 35.5 -350 ALL MSLP 544 0 0 1.6 3.1 3.5
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 548 0 0 2.8 3.0 4.1
89263 -66.0 -66.1 20 ALL MSLP 703 140 20 4.6 10.8 11.7
