Report
on the Quality of Land Surface Observations
in Region V
January-June 2008
Report No. 23
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 2008. The locations of the suspect stations are shown in Figure1 and diagrams of the residuals for each station are in Figures 2-4.
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 291 0 0 0.6 3.6 3.6 97008 3.6 125.5 38 ALL MSLP 495 1 0 1.0 3.0 3.2 98132 20.8 121.8 124 ALL MSLP 640 1 0 1.0 3.6 3.7
Table 1. List of land surface stations reporting suspect observations of mean sea level pressure over the period January-June 2008.
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 2008
********************
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 2008
-----------------------------------------------------------
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 167 0 0 2.2 -9.7 9.9
62803 11.9 31.0 885 ALL MSLP 246 2 1 1.8 -3.8 4.2
63330 13.5 39.5 2070 ALL MSLP 182 173 95 6.2 10.3 11.9
63331 12.6 37.4 1967 ALL MSLP 212 82 39 2.5 12.5 12.7
63333 11.1 39.7 1903 ALL MSLP 323 0 0 2.3 3.6 4.3
63340 9.1 36.5 2080 ALL MSLP 173 0 0 3.1 7.8 8.4
63402 7.7 36.8 1725 ALL MSLP 161 14 9 2.5 -11.3 11.6
63478 5.9 43.6 295 ALL MSLP 185 0 0 1.1 5.1 5.2
65361 9.0 1.1 387 ALL MSLP 255 1 0 1.4 -3.1 3.4
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 720 9 1 5.3 1.9 5.6
40754 35.7 51.3 1191 ALL MSLP 701 1 0 3.2 -3.9 5.0
40757 35.5 53.4 1171 ALL MSLP 701 1 0 3.3 -4.1 5.3
40789 33.8 55.1 921 ALL MSLP 705 0 0 3.2 -3.0 4.4
40791 33.6 56.9 711 ALL MSLP 699 1 0 2.7 -3.1 4.1
40800 32.6 51.7 1590 ALL MSLP 704 0 0 2.9 -4.4 5.3
40812 32.0 49.3 372 ALL MSLP 693 1 0 1.8 -3.3 3.7
40818 31.2 52.7 2004 ALL MSLP 709 0 0 3.2 -3.7 4.9
40835 30.4 50.8 738 ALL MSLP 665 1 0 1.7 -3.7 4.0
40854 29.1 58.4 1067 ALL MSLP 692 0 0 3.1 -4.7 5.7
40859 29.0 53.7 1383 ALL MSLP 703 0 0 2.5 -3.4 4.2
41530 34.0 71.6 360 ALL MSLP 632 1 0 3.2 -3.6 4.8
44207 50.4 100.2 1687 ALL MSLP 718 1 0 5.3 1.0 5.4
44212 49.8 92.1 936 ALL MSLP 721 101 14 5.9 3.9 7.0
44213 49.7 94.4 1232 ALL MSLP 724 26 4 5.6 3.7 6.7
44217 48.3 89.5 2148 ALL MSLP 703 43 6 5.0 2.0 5.4
44218 48.0 91.7 1406 ALL MSLP 714 20 3 5.9 0.4 5.9
44224 48.8 90.1 1928 ALL MSLP 705 81 11 5.6 1.5 5.8
44225 48.7 98.3 1723 ALL MSLP 724 119 16 5.4 3.3 6.3
44275 46.8 98.1 2255 ALL MSLP 720 7 1 5.7 0.7 5.7
44325 44.9 96.8 1183 ALL MSLP 710 14 2 5.6 0.5 5.6
44336 45.5 103.9 1316 ALL MSLP 678 6 1 3.4 3.8 5.1
51379 44.0 89.6 794 ALL MSLP 727 0 0 3.3 3.2 4.6
51709 39.5 76.0 1291 ALL MSLP 728 9 1 5.2 -2.5 5.8
51811 38.4 77.3 1232 ALL MSLP 728 5 1 6.2 -1.3 6.3
51818 37.6 78.3 1376 ALL MSLP 727 6 1 6.4 -0.9 6.4
51828 37.1 79.9 1375 ALL MSLP 728 1 0 5.3 -1.4 5.5
52533 39.8 98.5 1478 ALL MSLP 728 13 2 4.5 3.0 5.4
52652 38.9 100.4 1483 ALL MSLP 728 30 4 5.2 3.2 6.1
53352 41.7 110.4 1377 ALL MSLP 727 1 0 2.9 3.0 4.2
56287 30.0 103.0 629 ALL MSLP 728 0 0 3.1 3.9 5.0
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 324 0 0 0.8 -3.8 3.9
82353 -3.2 -52.2 74 ALL MSLP 520 0 0 1.1 -3.3 3.5
82704 -7.6 -72.7 170 ALL MSLP 518 1 0 1.8 -4.2 4.6
82765 -7.3 -47.5 193 ALL MSLP 521 1 0 1.2 3.0 3.2
83264 -12.2 -56.5 415 ALL MSLP 528 2 0 1.2 3.1 3.4
83319 -14.7 -52.3 315 ALL MSLP 522 2 0 1.1 3.1 3.3
83358 -15.8 -54.4 450 ALL MSLP 527 4 1 2.8 -7.2 7.8
83388 -15.1 -42.8 604 ALL MSLP 421 0 0 1.3 -3.5 3.8
84390 -4.6 -81.3 90 ALL MSLP 123 1 1 1.9 3.5 4.0
84401 -5.2 -80.6 55 ALL MSLP 636 1 0 1.8 5.0 5.3
84425 -5.9 -76.1 184 ALL MSLP 232 0 0 2.2 4.1 4.6
84455 -6.4 -76.4 282 ALL MSLP 482 1 0 1.9 5.8 6.1
84501 -8.1 -79.0 30 ALL MSLP 628 0 0 1.5 3.8 4.1
85210 -16.3 -58.4 124 ALL MSLP 330 1 0 1.1 3.7 3.8
85365 -22.0 -63.7 645 ALL MSLP 315 0 0 3.6 4.3 5.6
85406 -18.4 -70.3 55 ALL MSLP 710 0 0 2.0 3.2 3.8
85836 -43.6 -71.8 277 ALL MSLP 207 1 0 2.7 5.4 6.0
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 725 0 0 2.0 -3.9 4.4
71177 57.1 -61.5 834 ALL MSLP 726 0 0 3.6 -3.8 5.2
71826 66.2 -65.7 32 ALL MSLP 726 0 0 1.6 -3.7 4.0
71931 54.8 -112.0 567 ALL MSLP 163 37 23 7.5 0.5 7.5
72360 36.5 -103.2 1515 ALL MSLP 687 1 0 4.8 -3.0 5.7
72370 35.3 -113.9 1033 ALL MSLP 717 0 0 2.6 -3.4 4.3
72375 35.1 -11.2 2139 ALL MSLP 726 67 9 6.0 -3.2 6.7
72386 36.1 -115.2 664 ALL MSLP 720 0 0 2.4 -3.3 4.0
72387 36.6 -116.0 1009 ALL MSLP 708 0 0 2.7 -3.1 4.1
72462 37.4 -105.9 2299 ALL MSLP 724 8 1 6.0 -1.2 6.1
72464 38.3 -104.5 1439 ALL MSLP 721 0 0 5.0 -4.2 6.6
72476 39.1 -108.5 1475 ALL MSLP 725 1 0 4.3 -4.0 5.9
72565 39.9 -104.7 1656 ALL MSLP 726 0 0 4.7 -4.3 6.4
72672 43.1 -108.5 1703 ALL MSLP 703 0 0 4.2 -3.5 5.5
76055 31.0 -114.8 440 ALL MSLP 469 0 0 2.0 -3.1 3.7
76113 30.7 -111.7 419 ALL MSLP 126 0 0 1.5 -4.7 4.9
76220 29.0 -107.8 1870 ALL MSLP 639 3 0 5.1 0.5 5.1
76225 28.6 -106.1 1435 ALL MSLP 650 0 0 4.0 -4.6 6.1
76382 25.5 -103.4 1124 ALL MSLP 669 8 1 5.3 -3.0 6.1
76390 25.5 -101.0 1790 ALL MSLP 714 0 0 3.1 -3.1 4.4
76423 24.0 -104.7 1872 ALL MSLP 663 0 0 4.2 -3.9 5.8
76471 23.6 -103.6 2359 ALL MSLP 452 2 0 3.4 -3.2 4.7
76625 20.6 -100.4 1813 ALL MSLP 384 1 0 4.6 -4.0 6.1
76632 20.1 -98.7 2417 ALL MSLP 471 1 0 3.7 -3.7 5.3
76680 19.4 -99.2 2303 ALL MSLP 431 2 0 2.4 -4.8 5.4
76685 19.0 -98.2 2179 ALL MSLP 683 1 0 3.9 -3.5 5.2
76726 18.9 -99.2 1618 ALL MSLP 452 3 1 4.2 -3.9 5.7
76775 17.1 -96.7 1550 ALL MSLP 642 0 0 3.0 -3.3 4.4
76848 16.3 -92.1 1646 ALL MSLP 642 0 0 1.9 -4.5 4.9
78873 17.5 -63.0 39 ALL MSLP 132 48 36 5.1 -1.4 5.2
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 291 0 0 0.6 3.6 3.6
97008 3.6 125.5 38 ALL MSLP 495 1 0 1.0 3.0 3.2
98132 20.8 121.8 124 ALL MSLP 640 1 0 1.0 3.6 3.7
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 725 0 0 2.6 -3.1 4.1
11225 46.8 14.2 705 ALL MSLP 718 303 42 1.9 1.6 2.5
11232 46.6 14.8 527 ALL MSLP 719 8 1 6.0 4.3 7.4
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 648 1 0 2.6 -4.7 5.4
89272 -75.0 -70.8 1395 ALL MSLP 712 624 88 2.0 -12.3 12.5
89345 -89.7 -148.8 620 ALL MSLP 546 538 99 0.9 -13.7 13.8
89377 -82.5 -174.5 55 ALL MSLP 534 4 1 3.6 7.3 8.1
89504 -72.0 2.5 1290 ALL MSLP 206 0 0 2.9 -3.9 4.8
89512 -70.8 11.8 102 ALL MSLP 721 2 0 2.4 -6.1 6.6
89514 -70.8 11.7 117 ALL MSLP 664 8 1 2.5 -5.3 5.9
89592 -66.6 93.0 35 ALL MSLP 722 1 0 2.3 -5.4 5.9
89611 -66.3 110.5 41 ALL MSLP 723 3 0 2.6 -4.8 5.5
89642 -66.7 140.0 43 ALL MSLP 678 22 3 3.1 -7.4 8.0
89768 -78.6 166.7 920 ALL MSLP 572 2 0 3.1 -3.9 5.0
89864 -74.9 163.7 80 ALL MSLP 538 2 0 3.2 -3.3 4.6
89866 -77.4 163.7 120 ALL MSLP 551 2 0 3.1 -3.9 5.0
89869 -80.0 165.1 75 ALL MSLP 583 0 0 3.0 3.0 4.3
89873 -83.2 174.5 60 ALL MSLP 218 0 0 3.3 -3.4 4.7
89879 -71.9 171.2 30 ALL MSLP 539 31 6 2.3 -10.3 10.6
