Report
on the Quality of Land Surface Observations
in Region V
July to
December 2004
Report No. 16
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 to December 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 93419 -40.9 175.0 7 ALL MSLP 192 100 52 1.1 -0.7 1.3
96947 -8.0 112.7 526 ALL MSLP 162 0 0 1.5 3.8 4.0
97012 1.5 124.9 67 ALL MSLP 487 6 1 1.6 -7.7 7.8
97378 -10.7 123.1 1 ALL MSLP 258 202 78 3.7 -13.5 14.0Table 1. List of land surface stations reporting suspect observations of mean sea level pressure over the period July to December 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
JULY to DECEMBER 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 JUL to DEC 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 341 0 0 1.7 4.2 4.5
62271 24.2 23.3 436 ALL MSLP 272 0 0 1.4 3.4 3.7
62733 15.3 35.6 451 ALL MSLP 224 1 0 2.6 3.2 4.2
62751 14.4 33.5 408 ALL MSLP 216 0 0 2.4 3.1 4.0
62781 12.7 28.4 564 ALL MSLP 192 0 0 2.7 3.3 4.3
62790 12.1 24.9 674 ALL MSLP 181 0 0 2.4 3.5 4.2
62810 11.0 29.7 499 ALL MSLP 120 0 0 2.7 4.7 5.5
62880 7.7 28.0 438 ALL MSLP 122 1 1 2.5 4.3 5.0
64600 4.3 15.8 583 ALL MSLP 157 0 0 1.7 3.1 3.5
64650 4.4 18.5 366 ALL MSLP 211 1 0 1.9 4.0 4.4
64655 6.5 22.0 584 ALL MSLP 134 0 0 2.0 4.2 4.6
64660 5.8 20.6 475 ALL MSLP 194 0 0 1.7 3.5 3.9
64750 9.1 18.4 365 ALL MSLP 530 0 0 2.4 3.1 3.9
64754 11.0 20.3 436 ALL MSLP 235 0 0 2.5 4.7 5.3
65019 10.6 7.4 642 ALL MSLP 143 0 0 1.6 3.9 4.2
65125 9.3 7.0 344 ALL MSLP 166 0 0 2.0 5.3 5.6
65167 9.2 12.5 174 ALL MSLP 146 0 0 2.0 4.7 5.1
65416 9.0 -2.5 301 ALL MSLP 330 0 0 1.3 3.2 3.5
65418 9.5 -0.9 173 ALL MSLP 282 0 0 1.2 4.2 4.4
67241 -15.0 40.7 11 ALL MSLP 230 1 0 0.9 -3.5 3.7
68903 -37.0 -12.3 51 ALL MSLP 441 185 42 6.6 4.1 7.7
WMO REGION 2
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
24671 64.0 135.9 402 ALL MSLP 692 1 0 4.2 3.3 5.3
24688 63.3 143.1 741 ALL MSLP 723 89 12 5.2 2.9 6.0
38933 37.8 68.8 429 ALL MSLP 374 4 1 2.5 6.5 7.0
40700 39.7 48.1 45 ALL MSLP 681 0 0 1.4 -3.8 4.1
40726 36.8 45.7 1385 ALL MSLP 641 0 0 2.6 4.4 5.1
40741 36.5 61.2 236 ALL MSLP 672 1 0 1.7 -4.0 4.3
40836 30.8 51.7 1880 ALL MSLP 675 0 0 2.4 3.8 4.5
44203 51.1 99.7 1583 ALL MSLP 687 94 14 4.8 4.1 6.3
44207 50.4 100.2 1687 ALL MSLP 690 17 2 4.5 4.1 6.1
44212 49.8 92.1 936 ALL MSLP 698 44 6 4.8 4.1 6.3
44213 49.7 94.4 1232 ALL MSLP 703 37 5 4.9 3.6 6.1
44218 48.0 91.7 1406 ALL MSLP 694 26 4 5.1 1.7 5.3
44224 48.8 90.1 1928 ALL MSLP 678 115 17 6.2 2.0 6.5
44225 48.7 98.3 1723 ALL MSLP 703 97 14 4.9 4.6 6.8
44230 49.6 102.0 1236 ALL MSLP 692 7 1 3.4 4.9 5.9
44232 49.4 102.7 933 ALL MSLP 716 3 0 3.7 4.1 5.6
44272 47.8 96.8 1753 ALL MSLP 697 11 2 5.1 0.1 5.1
44275 46.8 98.1 2255 ALL MSLP 696 33 5 5.4 2.8 6.1
44277 46.4 96.3 2147 ALL MSLP 700 8 1 5.1 0.0 5.1
44284 46.7 100.1 2117 ALL MSLP 703 75 11 4.8 5.2 7.1
44285 46.9 102.8 1655 ALL MSLP 700 6 1 4.5 3.9 6.0
44329 44.6 98.7 2103 ALL MSLP 200 1 1 4.1 3.6 5.4
44336 45.5 103.9 1316 ALL MSLP 651 3 0 3.6 3.7 5.1
48952 15.7 106.4 168 ALL MSLP 271 0 0 1.7 -3.4 3.8
48957 14.8 106.8 105 ALL MSLP 131 0 0 1.4 3.2 3.5
51334 44.6 82.9 321 ALL MSLP 723 0 0 2.7 3.2 4.2
51818 37.6 78.3 1376 ALL MSLP 724 0 0 3.5 3.1 4.7
52495 40.8 104.5 1329 ALL MSLP 734 0 0 2.2 3.6 4.2
53192 44.0 114.9 1128 ALL MSLP 734 0 0 2.2 3.5 4.1
53352 41.7 110.4 1377 ALL MSLP 727 0 0 2.2 3.9 4.5
53480 41.0 113.1 1416 ALL MSLP 721 0 0 1.9 3.2 3.7
56287 30.0 103.0 629 ALL MSLP 736 0 0 1.6 3.5 3.9
WMO REGION 3
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
80398 -4.2 -69.9 84 ALL MSLP 204 1 0 1.3 5.6 5.7
82212 -2.5 -66.2 55 ALL MSLP 511 4 1 2.3 4.3 4.9
82287 -2.9 -41.6 22 ALL MSLP 537 0 0 0.7 -3.7 3.7
82353 -3.2 -52.2 74 ALL MSLP 525 0 0 1.2 -3.8 4.0
82425 -4.1 -63.1 46 ALL MSLP 394 0 0 1.4 3.6 3.9
82586 -5.2 -39.3 212 ALL MSLP 534 0 0 1.4 -4.2 4.4
82765 -7.3 -47.5 193 ALL MSLP 536 0 0 1.7 3.3 3.7
83264 -12.2 -56.5 415 ALL MSLP 465 1 0 1.1 5.3 5.4
83270 -13.5 -52.5 430 ALL MSLP 280 0 0 1.6 4.1 4.4
83319 -14.7 -52.3 315 ALL MSLP 523 2 0 1.3 4.8 5.0
83726 -22.0 -47.9 856 ALL MSLP 533 0 0 1.6 3.3 3.7
84377 -3.8 -73.3 126 ALL MSLP 546 0 0 1.4 4.0 4.3
84401 -5.2 -80.6 55 ALL MSLP 541 0 0 1.3 5.5 5.6
84452 -6.8 -79.8 34 ALL MSLP 536 0 0 1.7 5.0 5.3
84455 -6.4 -76.4 282 ALL MSLP 417 6 1 2.0 10.0 10.2
84501 -8.1 -79.0 30 ALL MSLP 421 1 0 1.7 5.9 6.1
84628 -12.0 -77.1 13 ALL MSLP 561 0 0 1.5 3.3 3.6
84720 -14.9 -74.9 567 ALL MSLP 249 2 1 1.6 6.0 6.2
84782 -18.1 -70.3 458 ALL MSLP 446 0 0 1.9 4.4 4.8
85041 -11.0 -68.8 235 ALL MSLP 315 0 0 2.0 6.8 7.1
85210 -16.3 -58.4 124 ALL MSLP 314 0 0 1.4 3.4 3.7
85365 -22.0 -63.7 645 ALL MSLP 309 0 0 3.3 3.2 4.6
85394 -22.8 -64.3 381 ALL MSLP 251 0 0 3.5 3.6 5.0
85406 -18.4 -70.3 55 ALL MSLP 716 1 0 2.2 4.8 5.2
85418 -20.5 -70.2 48 ALL MSLP 724 0 0 1.6 3.0 3.4
87222 -28.6 -65.8 454 ALL MSLP 722 0 0 2.5 -3.2 4.0
WMO REGION 4
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
71023 65.9 -89.4 18 ALL MSLP 736 163 22 7.4 1.5 7.6
71048 61.6 -125.8 610 ALL MSLP 376 0 0 1.5 4.0 4.3
71060 52.5 -116.1 1362 ALL MSLP 695 64 9 6.0 0.2 6.0
72375 35.1 -11.2 2139 ALL MSLP 722 24 3 5.8 -1.9 6.1
72376 36.2 -111.8 2181 ALL MSLP 719 1 0 4.1 4.4 6.0
72462 37.4 -105.9 2299 ALL MSLP 723 3 0 4.2 5.5 6.9
72475 38.4 -113.0 1536 ALL MSLP 723 0 0 3.4 3.2 4.7
72486 39.3 -114.8 1909 ALL MSLP 721 1 0 3.5 3.0 4.7
72570 40.5 -107.5 1915 ALL MSLP 727 1 0 3.4 5.7 6.7
72578 42.9 -112.6 1365 ALL MSLP 722 0 0 3.3 3.8 5.0
76061 31.3 -113.6 48 ALL MSLP 172 0 0 1.4 3.2 3.5
76220 29.0 -107.8 1932 ALL MSLP 217 26 12 3.0 9.9 10.4
76323 26.9 -105.7 1661 ALL MSLP 450 1 0 3.4 5.7 6.6
76373 25.4 -105.8 1967 ALL MSLP 267 0 0 4.6 3.5 5.8
76625 20.6 -100.4 1880 ALL MSLP 180 0 0 2.4 -4.6 5.1
76634 20.1 -98.4 2181 ALL MSLP 238 0 0 2.6 4.4 5.1
76658 19.2 -103.7 494 ALL MSLP 168 0 0 1.2 4.7 4.9
76687 19.5 -96.9 1389 ALL MSLP 522 0 0 1.4 5.4 5.6
76762 17.5 -99.5 1265 ALL MSLP 373 0 0 1.7 4.3 4.6
76848 16.3 -92.1 1646 ALL MSLP 403 0 0 1.4 -3.9 4.1
78090 25.4 -76.7 10000 ALL MSLP 246 5 2 6.0 -2.5 6.5
78588 17.2 -87.5 1 ALL MSLP 686 686 100 ** ** **
WMO REGION 5
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
93419 -40.9 175.0 7 ALL MSLP 192 100 52 1.1 -0.7 1.3
96947 -8.0 112.7 526 ALL MSLP 162 0 0 1.5 3.8 4.0
97012 1.5 124.9 67 ALL MSLP 487 6 1 1.6 -7.7 7.8
97378 -10.7 123.1 1 ALL MSLP 258 202 78 3.7 -13.5 14.0
WMO REGION ANTARCTICA
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
89263 -66.0 -66.1 20 ALL MSLP 723 196 27 2.6 11.8 12.1
89512 -70.8 11.8 102 ALL MSLP 730 9 1 3.1 -3.6 4.8
89514 -70.8 11.7 117 ALL MSLP 680 18 3 3.1 -4.2 5.2
