Report
on the Quality of Land Surface Observations
in Region V
January-June 2007
Report No. 21
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 2007. 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 253 0 0 0.9 3.2 3.3 97008 3.6 125.5 38 ALL MSLP 482 0 0 1.0 3.0 3.2
Table 1. List of land surface stations reporting suspect observations of mean sea level pressure over the period January-June 2007.
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 2007
********************
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 2007
-----------------------------------------------------------
WMO REGION 1
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
61099 11.9 3.5 203 ALL MSLP 609 4 1 2.3 -4.9 5.4
62803 11.9 31.0 885 ALL MSLP 289 0 0 1.7 -3.1 3.6
63330 13.5 39.5 2070 ALL MSLP 224 71 32 2.2 11.4 11.6
63333 11.1 39.7 1903 ALL MSLP 339 0 0 2.2 4.6 5.1
63402 7.7 36.8 1725 ALL MSLP 170 8 5 2.9 -10.3 10.7
63478 5.9 43.6 295 ALL MSLP 193 0 0 2.9 5.0 5.7
65445 6.2 -2.3 172 ALL MSLP 253 0 0 2.4 3.2 4.0
WMO REGION 2
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
38944 37.5 69.4 448 ALL MSLP 550 7 1 2.7 -7.0 7.5
40754 35.7 51.3 1191 ALL MSLP 687 1 0 2.7 -3.8 4.7
40757 35.5 53.4 1171 ALL MSLP 687 1 0 3.0 -3.5 4.6
40789 33.8 55.1 921 ALL MSLP 689 1 0 2.6 -3.0 4.0
40800 32.6 51.7 1590 ALL MSLP 691 0 0 2.8 -3.3 4.3
40835 30.4 50.8 738 ALL MSLP 655 0 0 1.9 -3.1 3.6
40854 29.1 58.4 1067 ALL MSLP 674 0 0 2.5 -4.9 5.5
41530 34.0 71.6 360 ALL MSLP 646 3 0 2.9 -3.3 4.4
44207 50.4 100.2 1687 ALL MSLP 713 1 0 5.0 0.2 5.0
44212 49.8 92.1 936 ALL MSLP 715 110 15 5.3 3.1 6.2
44213 49.7 94.4 1232 ALL MSLP 714 31 4 5.5 3.1 6.3
44215 49.1 91.7 1591 ALL MSLP 719 2 0 5.2 -0.8 5.3
44218 48.0 91.7 1406 ALL MSLP 716 4 1 5.8 -0.4 5.8
44224 48.8 90.1 1928 ALL MSLP 703 75 11 6.3 1.0 6.3
44225 48.7 98.3 1723 ALL MSLP 716 93 13 5.6 3.3 6.5
44275 46.8 98.1 2255 ALL MSLP 712 17 2 5.9 0.6 5.9
44284 46.7 100.1 2117 ALL MSLP 717 136 19 5.0 2.3 5.5
44416 28.6 81.6 720 ALL MSLP 396 5 1 4.6 -3.3 5.6
47020 41.0 126.6 306 ALL MSLP 487 29 6 6.1 -3.9 7.2
48952 15.7 106.4 168 ALL MSLP 258 1 0 1.3 -4.4 4.6
48957 14.8 106.8 105 ALL MSLP 200 0 0 1.3 3.2 3.4
51379 44.0 89.6 794 ALL MSLP 709 0 0 3.3 3.3 4.6
51709 39.5 76.0 1291 ALL MSLP 722 4 1 4.3 -4.3 6.1
51811 38.4 77.3 1232 ALL MSLP 723 6 1 4.8 -3.3 5.8
51828 37.1 79.9 1375 ALL MSLP 724 7 1 4.4 -3.1 5.4
52652 38.9 100.4 1483 ALL MSLP 722 1 0 4.5 3.3 5.6
53192 44.0 114.9 1128 ALL MSLP 724 0 0 2.7 3.3 4.3
56287 30.0 103.0 629 ALL MSLP 724 0 0 3.0 3.3 4.5
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 131 0 0 1.7 -4.3 4.6
82287 -2.9 -41.6 22 ALL MSLP 336 0 0 0.9 -4.1 4.2
82353 -3.2 -52.2 74 ALL MSLP 535 1 0 1.0 -3.3 3.4
82704 -7.6 -72.7 170 ALL MSLP 535 1 0 1.4 -4.6 4.8
82861 -8.3 -49.3 157 ALL MSLP 534 0 0 1.1 -3.0 3.3
83264 -12.2 -56.5 415 ALL MSLP 540 0 0 1.1 3.1 3.2
83358 -15.8 -54.4 450 ALL MSLP 307 2 1 2.6 -7.4 7.8
83388 -15.1 -42.8 604 ALL MSLP 539 0 0 1.2 -3.8 4.0
83970 -31.3 -50.9 5 ALL MSLP 192 0 0 1.6 -5.3 5.5
84390 -4.6 -81.3 90 ALL MSLP 146 0 0 1.7 3.7 4.0
84401 -5.2 -80.6 55 ALL MSLP 653 0 0 2.1 4.7 5.1
84425 -5.9 -76.1 184 ALL MSLP 135 2 1 1.4 5.3 5.5
84455 -6.4 -76.4 282 ALL MSLP 546 1 0 1.9 6.4 6.7
84501 -8.1 -79.0 30 ALL MSLP 553 0 0 1.5 3.9 4.2
84531 -9.2 -78.5 21 ALL MSLP 136 0 0 1.4 3.0 3.3
84782 -18.1 -70.3 458 ALL MSLP 558 0 0 1.9 3.2 3.7
85210 -16.3 -58.4 124 ALL MSLP 317 0 0 1.0 3.1 3.3
85365 -22.0 -63.7 645 ALL MSLP 298 0 0 2.9 3.8 4.8
85406 -18.4 -70.3 55 ALL MSLP 701 0 0 2.0 3.6 4.1
87418 -32.8 -68.8 704 ALL MSLP 689 1 0 3.0 -3.5 4.6
WMO REGION 4
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
71177 57.1 -61.5 834 ALL MSLP 717 0 0 3.1 -3.4 4.6
71618 45.3 -72.3 851 ALL MSLP 488 0 0 1.6 -3.5 3.8
71826 66.2 -65.7 32 ALL MSLP 687 0 0 2.2 -3.6 4.2
72370 35.3 -113.9 1033 ALL MSLP 715 0 0 2.7 -3.4 4.3
72375 35.1 -11.2 2139 ALL MSLP 713 70 10 5.6 -4.3 7.0
72387 36.6 -116.0 1009 ALL MSLP 711 0 0 2.9 -3.0 4.2
72462 37.4 -105.9 2299 ALL MSLP 702 1 0 5.9 -0.7 6.0
72464 38.3 -104.5 1439 ALL MSLP 703 0 0 5.1 -2.8 5.8
72476 39.1 -108.5 1475 ALL MSLP 712 2 0 4.9 -4.4 6.5
72565 39.9 -104.7 1656 ALL MSLP 709 0 0 4.6 -3.2 5.6
72672 43.1 -108.5 1703 ALL MSLP 704 0 0 4.4 -3.4 5.5
76055 31.0 -114.8 440 ALL MSLP 508 0 0 2.0 -3.5 4.0
76225 28.6 -106.1 1435 ALL MSLP 673 0 0 4.1 -3.9 5.6
76382 25.5 -103.4 1124 ALL MSLP 604 5 1 5.4 -1.4 5.6
76423 24.0 -104.7 1872 ALL MSLP 655 2 0 4.1 -3.7 5.5
76471 23.6 -103.6 2359 ALL MSLP 583 0 0 3.9 -3.9 5.5
76632 20.1 -98.7 2417 ALL MSLP 286 8 3 3.2 -8.0 8.6
76680 19.4 -99.2 2303 ALL MSLP 272 1 0 2.6 -5.0 5.7
76685 19.0 -98.2 2179 ALL MSLP 472 1 0 3.5 -4.6 5.8
76726 18.9 -99.2 1618 ALL MSLP 233 0 0 3.3 -4.0 5.2
76775 17.1 -96.7 1550 ALL MSLP 388 0 0 2.7 -3.7 4.6
76848 16.3 -92.1 1646 ALL MSLP 386 0 0 1.7 -4.7 5.0
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 253 0 0 0.9 3.2 3.3
97008 3.6 125.5 38 ALL MSLP 482 0 0 1.0 3.0 3.2
WMO REGION 6
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
04270 61.2 -45.4 32 ALL MSLP 721 0 0 2.8 -3.2 4.3
08226 40.7 -3.2 640 ALL MSLP 337 1 0 1.8 -4.5 4.9
40030 35.1 36.8 303 ALL MSLP 445 2 0 1.6 -3.6 3.9
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 403 0 0 2.6 -3.6 4.4
89269 -64.8 -64.1 8 ALL MSLP 235 235 100 ** ** **
89272 -75.0 -70.8 1395 ALL MSLP 542 542 100 ** ** **
89345 -89.7 -148.8 620 ALL MSLP 527 521 99 6.0 -10.9 12.2
89377 -82.5 -174.5 55 ALL MSLP 198 1 1 4.0 4.2 5.8
89512 -70.8 11.8 102 ALL MSLP 717 0 0 2.1 -4.4 4.8
89642 -66.7 140.0 43 ALL MSLP 688 0 0 2.9 -5.2 6.0
89768 -78.6 166.7 920 ALL MSLP 550 5 1 2.7 -5.5 6.1
89864 -74.9 163.7 80 ALL MSLP 550 0 0 2.8 -4.8 5.6
89866 -77.4 163.7 120 ALL MSLP 548 4 1 2.9 -6.7 7.3
89868 -79.9 170.0 60 ALL MSLP 562 4 1 2.7 -3.9 4.7
89873 -83.2 174.5 60 ALL MSLP 557 2 0 3.2 -3.4 4.7
89879 -71.9 171.2 30 ALL MSLP 521 19 4 2.8 -9.3 9.7
