Report
on the Quality of Land Surface Observations
in Region V
July to
December 2005
Report No. 18
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 2005. 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 91329 8.6 151.9 1 ALL MSLP 137 0 0 1.3 3.1 3.4
91336 6.9 152.7 1 ALL MSLP 124 0 0 2.6 3.4 4.3
97008 3.6 125.5 38 ALL MSLP 507 0 0 0.9 3.0 3.2
97378 -10.7 123.1 1 ALL MSLP 206 159 77 0.5 -14.4 14.4Table 1. List of land surface stations reporting suspect observations of mean sea level pressure over the period July to December 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
JULY to DECEMBER 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 JUL to DEC 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 205 0 0 1.8 3.6 4.0
63160 10.4 45.0 9 ALL MSLP 131 8 6 1.2 -3.8 4.0
63210 11.3 49.2 2 ALL MSLP 147 2 1 1.4 -3.2 3.5
63671 1.8 40.1 244 ALL MSLP 671 0 0 1.5 -5.1 5.3
68903 -37.0 -12.3 51 ALL MSLP 164 160 98 7.2 -1.6 6.4
WMO REGION 2
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
31137 56.3 131.1 850 ALL MSLP 708 1 0 4.1 3.0 5.1
38933 37.8 68.8 429 ALL MSLP 276 0 0 2.8 6.4 7.0
40700 39.7 48.1 45 ALL MSLP 674 1 0 1.4 -4.4 4.6
40740 37.1 58.5 1287 ALL MSLP 674 0 0 1.9 -3.1 3.6
40754 35.7 51.3 1191 ALL MSLP 665 0 0 2.7 -4.3 5.1
40757 35.5 53.4 1171 ALL MSLP 683 0 0 2.8 -3.4 4.4
40789 33.8 55.1 845 ALL MSLP 683 0 0 2.5 -3.1 4.0
40791 33.6 56.9 711 ALL MSLP 652 0 0 2.3 -3.5 4.2
40835 30.4 50.8 738 ALL MSLP 642 0 0 1.9 -3.3 3.8
40854 29.1 58.4 1067 ALL MSLP 627 0 0 2.3 -5.1 5.6
40859 29.0 53.7 1288 ALL MSLP 646 1 0 2.5 -3.2 4.0
41396 16.0 49.0 700 ALL MSLP 293 0 0 1.7 3.8 4.2
44203 51.1 99.7 1583 ALL MSLP 705 10 1 4.1 4.1 5.8
44214 49.0 90.0 1714 ALL MSLP 719 24 3 6.1 -0.5 6.1
44218 48.0 91.7 1406 ALL MSLP 723 27 4 5.3 0.7 5.3
44221 49.7 96.4 1420 ALL MSLP 718 34 5 5.1 3.1 6.0
44224 48.8 90.1 1928 ALL MSLP 712 83 12 6.2 1.8 6.4
44225 48.7 98.3 1723 ALL MSLP 726 69 10 5.0 4.1 6.5
44230 49.6 102.0 1236 ALL MSLP 722 0 0 2.9 3.5 4.5
44263 46.9 91.1 1951 ALL MSLP 701 28 4 4.3 5.1 6.6
44266 46.3 93.9 2222 ALL MSLP 721 2 0 4.0 3.1 5.0
44275 46.8 98.1 2255 ALL MSLP 724 11 2 5.6 2.4 6.1
44284 46.7 100.1 2117 ALL MSLP 720 12 2 4.7 4.2 6.3
44329 44.6 98.7 2103 ALL MSLP 719 7 1 3.6 3.0 4.7
44338 44.7 102.2 1519 ALL MSLP 704 2 0 3.9 3.0 4.9
48952 15.7 106.4 168 ALL MSLP 299 0 0 1.4 -3.7 3.9
48957 14.8 106.8 105 ALL MSLP 212 0 0 1.7 3.2 3.6
52533 39.8 98.5 1478 ALL MSLP 730 1 0 3.0 3.3 4.4
52652 38.9 100.4 1483 ALL MSLP 730 2 0 3.9 3.5 5.2
53192 44.0 114.9 1128 ALL MSLP 730 0 0 2.3 3.1 3.9
56287 30.0 103.0 629 ALL MSLP 735 0 0 2.4 3.4 4.2
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 163 0 0 1.6 -5.0 5.2
80315 3.0 -75.3 443 ALL MSLP 354 0 0 2.0 -3.4 3.9
82287 -2.9 -41.6 22 ALL MSLP 338 0 0 1.3 -3.6 3.9
82353 -3.2 -52.2 74 ALL MSLP 540 2 0 1.2 -3.8 4.0
82586 -5.2 -39.3 212 ALL MSLP 543 1 0 1.4 -4.4 4.7
82704 -7.6 -72.7 170 ALL MSLP 532 1 0 2.3 -3.9 4.6
83264 -12.2 -56.5 415 ALL MSLP 542 0 0 1.5 3.5 3.8
83388 -15.1 -42.8 604 ALL MSLP 542 0 0 1.4 -4.6 4.8
83970 -31.3 -50.9 5 ALL MSLP 366 1 0 2.7 -3.8 4.7
84401 -5.2 -80.6 55 ALL MSLP 662 0 0 1.7 3.9 4.2
84425 -5.9 -76.1 184 ALL MSLP 126 0 0 1.9 6.2 6.5
84452 -6.8 -79.8 34 ALL MSLP 639 0 0 1.6 6.3 6.5
84455 -6.5 -76.4 282 ALL MSLP 482 2 0 2.7 7.0 7.6
84501 -8.1 -79.0 30 ALL MSLP 491 0 0 1.7 5.4 5.7
84531 -9.1 -78.5 27 ALL MSLP 136 0 0 1.3 4.0 4.2
84628 -12.0 -77.1 13 ALL MSLP 672 0 0 1.5 3.1 3.5
84720 -14.9 -74.9 567 ALL MSLP 320 1 0 1.5 6.0 6.2
84773 -17.7 -71.3 9 ALL MSLP 123 0 0 1.3 3.6 3.9
84782 -18.1 -70.3 458 ALL MSLP 491 0 0 1.9 3.9 4.3
85406 -18.5 -70.2 58 ALL MSLP 723 0 0 2.2 4.4 4.9
87222 -28.6 -65.8 454 ALL MSLP 700 0 0 2.6 -3.5 4.3
87418 -32.8 -68.8 704 ALL MSLP 694 1 0 4.1 -3.2 5.2
88900 -54.0 -38.0 2 ALL MSLP 340 48 14 6.5 0.9 6.6
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 711 98 14 7.1 1.4 7.3
71684 50.1 -122.9 1628 ALL MSLP 721 0 0 2.7 -3.3 4.3
71686 50.1 -123.0 903 ALL MSLP 727 0 0 2.0 -3.6 4.1
71746 82.3 -43.0 181 ALL MSLP 157 49 31 8.2 -0.4 8.2
71786 51.5 -116.3 1615 ALL MSLP 726 0 0 2.5 3.4 4.2
71826 66.2 -65.7 32 ALL MSLP 564 0 0 1.8 -3.2 3.7
72375 35.1 -11.2 2139 ALL MSLP 721 25 3 5.6 -1.4 5.8
72376 36.2 -111.8 2181 ALL MSLP 722 1 0 4.6 3.6 5.8
72462 37.4 -105.9 2299 ALL MSLP 725 5 1 5.9 4.0 7.1
72570 40.5 -107.5 1915 ALL MSLP 725 2 0 5.2 4.0 6.6
72576 42.8 -108.7 1694 ALL MSLP 721 0 0 5.3 0.5 5.4
76061 31.3 -113.6 48 ALL MSLP 205 0 0 1.7 3.7 4.0
76220 29.0 -107.8 1932 ALL MSLP 315 60 19 2.9 8.9 9.3
76323 26.9 -105.7 1661 ALL MSLP 458 6 1 4.2 4.6 6.2
76625 20.6 -100.4 1880 ALL MSLP 198 0 0 2.2 -4.1 4.6
76634 20.1 -98.4 2181 ALL MSLP 209 0 0 2.7 4.6 5.3
76658 19.2 -103.7 494 ALL MSLP 144 0 0 1.5 4.9 5.1
76680 19.4 -99.2 2303 ALL MSLP 361 2 1 2.5 -4.7 5.3
76685 19.0 -98.2 2179 ALL MSLP 494 0 0 3.0 -3.2 4.4
76762 17.5 -99.5 1265 ALL MSLP 397 0 0 1.7 3.8 4.2
76848 16.3 -92.1 1646 ALL MSLP 361 0 0 1.7 -3.7 4.0
78482 18.2 -71.1 12 ALL MSLP 269 0 0 2.7 3.1 4.1
78588 17.2 -87.5 1 ALL MSLP 732 732 100 ** ** **
78760 10.0 -84.8 3 ALL MSLP 170 0 0 1.5 3.1 3.5
WMO REGION 5
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
91329 8.6 151.9 1 ALL MSLP 137 0 0 1.3 3.1 3.4
91336 6.9 152.7 1 ALL MSLP 124 0 0 2.6 3.4 4.3
97008 3.6 125.5 38 ALL MSLP 507 0 0 0.9 3.0 3.2
97378 -10.7 123.1 1 ALL MSLP 206 159 77 0.5 -14.4 14.4
WMO REGION 6
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
11137 47.4 12.9 810 ALL MSLP 727 0 0 2.0 3.3 3.9
40030 35.1 36.8 303 ALL MSLP 318 0 0 1.1 -3.3 3.5
WMO REGION ANTARCTICA
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
89512 -70.8 11.8 102 ALL MSLP 723 1 0 3.0 -3.9 4.9
89514 -70.8 11.7 117 ALL MSLP 668 4 1 2.9 -4.2 5.2
89642 -66.7 140.0 41 ALL MSLP 709 1 0 3.3 -4.8 5.8
