Report
on the Quality of Land Surface Observations
in Region V
January
to June 2005
Report No. 17
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 2005. The locations of the suspect stations are shown in Figure1 and diagrams of the residuals for each of 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 97012 1.5 124.9 67 ALL MSLP 127 1 1 2.8 -8.2 8.7 97378 -10.7 123.1 1 ALL MSLP 241 186 77 0.5 -14.5 14.5
Table 1. List of land surface stations reporting suspect observations of mean sea level pressure over the period January to June 2005.
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 2005
********************
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 2005
-----------------------------------------------------------
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 326 0 0 1.6 4.0 4.3
62271 24.2 23.3 436 ALL MSLP 440 0 0 1.7 3.1 3.6
63671 1.8 40.1 244 ALL MSLP 389 0 0 2.0 -5.7 6.1
65125 9.3 7.0 344 ALL MSLP 132 0 0 1.9 5.1 5.4
65401 10.9 -1.1 203 ALL MSLP 167 0 0 1.3 3.1 3.4
68903 -37.0 -12.3 51 ALL MSLP 195 185 95 7.2 4.2 8.0
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 721 87 12 5.9 3.1 6.7
36096 51.7 94.5 628 ALL MSLP 713 58 8 5.5 2.7 6.1
36864 43.5 75.3 743 ALL MSLP 718 9 1 3.1 3.3 4.5
38933 37.8 68.8 429 ALL MSLP 377 0 0 2.8 7.3 7.9
40700 39.7 48.1 45 ALL MSLP 691 0 0 1.6 -4.0 4.3
40726 36.8 45.7 1385 ALL MSLP 593 11 2 3.1 4.5 5.5
40836 30.8 51.7 1880 ALL MSLP 657 0 0 2.5 3.5 4.3
40854 29.1 58.4 1067 ALL MSLP 667 2 0 2.6 -3.5 4.3
41396 16.0 49.0 700 ALL MSLP 275 0 0 1.9 4.2 4.6
44203 51.1 99.7 1583 ALL MSLP 710 197 28 5.0 3.2 5.9
44207 50.4 100.2 1687 ALL MSLP 707 63 9 5.0 4.2 6.5
44212 49.8 92.1 936 ALL MSLP 712 260 37 5.3 2.6 5.9
44213 49.7 94.4 1232 ALL MSLP 714 233 33 5.6 2.7 6.2
44214 49.0 90.0 1714 ALL MSLP 719 53 7 5.7 2.5 6.2
44215 49.1 91.7 1591 ALL MSLP 718 182 25 5.8 1.6 6.0
44216 48.8 93.1 1051 ALL MSLP 690 255 37 5.6 0.9 5.6
44218 48.0 91.7 1406 ALL MSLP 714 179 25 6.3 1.0 6.3
44219 47.6 95.0 1391 ALL MSLP 697 203 29 5.9 1.2 6.1
44221 49.7 96.4 1420 ALL MSLP 708 239 34 5.8 2.5 6.3
44224 48.8 90.1 1928 ALL MSLP 700 210 30 6.5 1.4 6.6
44225 48.7 98.3 1723 ALL MSLP 710 252 35 5.6 3.0 6.4
44229 48.2 99.9 2055 ALL MSLP 710 59 8 5.2 3.9 6.5
44230 49.6 102.0 1236 ALL MSLP 715 8 1 4.3 4.4 6.1
44231 49.6 100.2 1288 ALL MSLP 714 27 4 6.0 2.4 6.4
44232 49.4 102.7 933 ALL MSLP 710 6 1 4.9 3.8 6.2
44241 48.9 106.1 807 ALL MSLP 718 5 1 4.0 3.3 5.2
44263 46.9 91.1 1951 ALL MSLP 698 171 24 4.5 4.6 6.5
44265 46.1 91.6 1186 ALL MSLP 713 43 6 5.1 2.9 5.9
44266 46.3 93.9 2222 ALL MSLP 712 29 4 5.0 3.4 6.1
44272 47.8 96.8 1753 ALL MSLP 708 55 8 6.8 0.9 6.8
44275 46.8 98.1 2255 ALL MSLP 711 117 16 5.9 2.9 6.5
44277 46.4 96.3 2147 ALL MSLP 715 4 1 5.7 0.8 5.8
44284 46.7 100.1 2117 ALL MSLP 714 176 25 5.3 3.5 6.4
44285 46.9 102.8 1655 ALL MSLP 713 12 2 5.2 3.1 6.0
44291 47.8 106.8 1272 ALL MSLP 711 7 1 5.1 2.7 5.8
44302 47.8 112.1 926 ALL MSLP 695 4 1 3.3 3.2 4.6
44325 44.9 96.8 1183 ALL MSLP 708 54 8 5.4 1.1 5.5
44329 44.6 98.7 2103 ALL MSLP 705 11 2 4.0 4.4 6.0
44336 45.5 103.9 1316 ALL MSLP 672 30 4 4.4 4.3 6.1
44338 44.7 102.2 1519 ALL MSLP 692 33 5 4.3 4.9 6.5
48952 15.7 106.4 168 ALL MSLP 164 0 0 1.5 -4.8 5.1
51087 47.0 89.5 827 ALL MSLP 723 10 1 4.3 3.3 5.4
51243 45.6 84.8 428 ALL MSLP 722 1 0 4.2 3.0 5.2
51334 44.6 82.9 321 ALL MSLP 713 3 0 4.6 4.0 6.1
51379 44.0 89.6 794 ALL MSLP 708 10 1 4.0 3.4 5.3
51463 43.8 87.7 919 ALL MSLP 722 3 0 3.8 3.5 5.2
53192 44.0 114.9 1128 ALL MSLP 723 0 0 2.5 3.2 4.0
56287 30.0 103.0 629 ALL MSLP 724 0 0 2.0 3.3 3.8
WMO REGION 3
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
80099 7.1 -70.7 128 ALL MSLP 134 0 0 1.6 -3.8 4.1
80398 -4.2 -69.9 84 ALL MSLP 250 0 0 1.3 5.0 5.2
82212 -2.5 -66.2 55 ALL MSLP 536 2 0 2.0 4.3 4.7
82287 -2.9 -41.6 22 ALL MSLP 467 0 0 0.9 -3.8 3.9
82353 -3.2 -52.2 74 ALL MSLP 525 0 0 1.5 -3.5 3.8
82425 -4.1 -63.1 46 ALL MSLP 472 0 0 1.6 3.1 3.5
82445 -4.3 -55.6 45 ALL MSLP 539 0 0 1.5 3.1 3.4
82586 -5.2 -39.3 212 ALL MSLP 535 0 0 1.2 -4.3 4.5
82861 -8.3 -49.3 157 ALL MSLP 521 0 0 1.6 -3.3 3.6
83264 -12.2 -56.5 415 ALL MSLP 521 2 0 1.2 5.3 5.5
83270 -13.5 -52.5 430 ALL MSLP 511 0 0 1.7 4.0 4.3
83319 -14.7 -52.3 315 ALL MSLP 517 2 0 1.5 5.1 5.4
83388 -15.1 -42.8 604 ALL MSLP 530 0 0 1.6 -3.5 3.9
83726 -22.0 -47.9 856 ALL MSLP 534 0 0 1.7 3.5 3.9
84377 -3.8 -73.3 126 ALL MSLP 651 0 0 1.5 3.5 3.8
84401 -5.2 -80.6 55 ALL MSLP 651 3 0 1.7 5.3 5.5
84425 -5.9 -76.1 184 ALL MSLP 132 0 0 1.3 8.2 8.3
84452 -6.8 -79.8 34 ALL MSLP 618 1 0 1.6 6.4 6.6
84455 -6.5 -76.4 282 ALL MSLP 476 2 0 2.0 9.3 9.6
84501 -8.1 -79.0 30 ALL MSLP 463 0 0 1.6 5.6 5.8
84531 -9.1 -78.5 27 ALL MSLP 127 0 0 1.3 3.1 3.3
84720 -14.9 -74.9 567 ALL MSLP 313 0 0 1.5 6.1 6.2
84782 -18.1 -70.3 458 ALL MSLP 489 0 0 1.7 3.9 4.2
85041 -11.0 -68.8 235 ALL MSLP 348 0 0 2.0 7.1 7.4
85210 -16.3 -58.4 124 ALL MSLP 333 0 0 1.4 3.7 3.9
85268 -18.3 -59.8 276 ALL MSLP 339 0 0 1.5 3.5 3.8
85365 -22.0 -63.7 645 ALL MSLP 332 2 1 2.8 3.9 4.8
85394 -22.8 -64.3 381 ALL MSLP 269 1 0 2.5 3.1 4.0
85406 -18.4 -70.3 55 ALL MSLP 712 0 0 1.7 4.7 5.0
85418 -20.5 -70.2 48 ALL MSLP 706 0 0 1.3 3.3 3.5
88900 -54.0 -38.0 2 ALL MSLP 129 20 16 6.3 -0.7 6.3
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 721 146 20 7.7 -0.5 7.7
71094 66.7 -61.4 725 ALL MSLP 311 0 0 2.4 -3.6 4.3
71506 67.0 -136.2 720 ALL MSLP 597 0 0 2.1 -3.8 4.4
72375 35.1 -11.2 2139 ALL MSLP 669 73 11 5.4 -4.1 6.8
72462 37.4 -105.9 2299 ALL MSLP 712 3 0 4.3 3.1 5.3
72570 40.5 -107.5 1915 ALL MSLP 624 2 0 3.5 3.1 4.6
76061 31.3 -113.6 48 ALL MSLP 179 0 0 1.4 4.2 4.5
76220 29.0 -107.8 1932 ALL MSLP 308 29 9 3.0 9.0 9.5
76323 26.9 -105.7 1661 ALL MSLP 474 1 0 3.9 4.1 5.7
76625 20.6 -100.4 1880 ALL MSLP 202 0 0 2.8 -4.0 4.8
76634 20.1 -98.4 2181 ALL MSLP 195 0 0 2.7 3.9 4.7
76658 19.2 -103.7 494 ALL MSLP 151 0 0 1.3 5.3 5.5
76685 19.0 -98.2 2179 ALL MSLP 486 0 0 3.8 -3.4 5.1
76726 18.9 -99.2 1618 ALL MSLP 362 0 0 3.9 -4.4 5.9
76762 17.5 -99.5 1265 ALL MSLP 320 0 0 1.4 3.5 3.7
76848 16.3 -92.1 1646 ALL MSLP 382 0 0 1.9 -4.1 4.5
78588 17.2 -87.5 1 ALL MSLP 688 688 100 ** ** **
WMO REGION 5
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
97012 1.5 124.9 67 ALL MSLP 127 1 1 2.8 -8.2 8.7
97378 -10.7 123.1 1 ALL MSLP 241 186 77 0.5 -14.5 14.5
WMO REGION 6
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
11116 47.5 10.8 870 ALL MSLP 357 0 0 2.3 3.1 3.8
17042 41.4 41.4 33 ALL MSLP 648 0 0 3.6 4.2 5.5
40030 35.1 36.8 303 ALL MSLP 441 0 0 1.5 -3.7 4.0
40296 31.0 35.5 -350 ALL MSLP 567 1 0 1.4 3.1 3.3
WMO REGION ANTARCTICA
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
89504 -72.0 2.4 1290 ALL MSLP 132 2 2 5.7 1.2 5.9
89514 -70.8 11.7 117 ALL MSLP 571 8 1 2.7 -3.3 4.2
