Report
on the Quality of Land Surface Observations
in Region V
July-December 2006
Report No. 20
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-December 2006. The locations of the suspect stations are shown in Figure1 and diagrams of the residuals for each station are in Figure 2.
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 212 0 0 0.7 3.2 3.2
Table 1. List of land surface stations reporting suspect observations of mean sea level pressure over the period July-December 2006.
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 2006
*********************
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 2006
-----------------------------------------------------------
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 184 0 0 1.4 3.3 3.6
63210 11.3 49.2 2 ALL MSLP 137 1 1 2.1 -3.0 3.7
63330 13.5 39.5 2070 ALL MSLP 315 126 40 2.6 12.0 12.3
63333 11.1 39.7 1903 ALL MSLP 457 0 0 2.5 5.3 5.8
63402 7.7 36.8 1725 ALL MSLP 262 17 6 2.8 -10.0 10.4
63451 8.7 39.0 1900 ALL MSLP 553 0 0 2.6 3.6 4.5
WMO REGION 2
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
28666 55.3 67.3 140 ALL MSLP 688 2 0 2.3 4.9 5.4
31137 56.3 131.1 850 ALL MSLP 713 1 0 3.8 3.2 5.0
38944 37.5 69.4 448 ALL MSLP 621 1 0 2.4 -6.7 7.2
40700 39.7 48.1 45 ALL MSLP 674 2 0 1.6 -4.8 5.0
40740 36.8 54.3 1287 ALL MSLP 693 1 0 1.9 -3.2 3.7
40754 35.7 51.3 1191 ALL MSLP 698 1 0 2.9 -3.6 4.7
40757 35.5 53.4 1171 ALL MSLP 678 2 0 2.6 -3.8 4.6
40789 33.8 55.1 921 ALL MSLP 682 0 0 2.7 -3.3 4.3
40791 33.6 56.9 711 ALL MSLP 652 0 0 2.5 -3.3 4.1
40835 30.4 50.8 738 ALL MSLP 644 0 0 1.8 -3.6 4.1
40851 29.5 55.7 1739 ALL MSLP 680 0 0 3.0 -3.1 4.3
40854 29.1 58.4 1067 ALL MSLP 663 1 0 2.4 -5.1 5.7
40859 29.0 53.7 1383 ALL MSLP 681 0 0 2.7 -3.5 4.4
44203 51.1 99.7 1583 ALL MSLP 672 7 1 4.0 3.4 5.2
44224 48.8 90.1 1928 ALL MSLP 671 91 14 6.2 1.9 6.5
44225 48.7 98.3 1723 ALL MSLP 686 73 11 5.1 4.6 6.8
44230 49.6 102.0 1236 ALL MSLP 687 0 0 2.5 3.1 4.0
44275 46.8 98.1 2255 ALL MSLP 683 22 3 5.6 1.7 5.8
44284 46.7 100.1 2117 ALL MSLP 680 58 9 5.1 3.2 6.0
48952 15.7 106.4 168 ALL MSLP 281 0 0 1.6 -3.4 3.7
48957 14.8 106.8 105 ALL MSLP 234 0 0 1.4 3.7 4.0
52652 38.9 100.4 1483 ALL MSLP 730 0 0 4.0 3.3 5.2
WMO REGION 3
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
80315 3.0 -75.3 443 ALL MSLP 240 0 0 2.3 -3.4 4.1
82287 -2.9 -41.6 22 ALL MSLP 336 0 0 0.8 -4.5 4.6
82353 -3.2 -52.2 74 ALL MSLP 533 0 0 1.0 -3.6 3.8
82704 -7.6 -72.7 170 ALL MSLP 533 2 0 1.3 -5.2 5.4
82861 -8.3 -49.3 157 ALL MSLP 531 0 0 1.2 -3.6 3.8
83388 -15.1 -42.8 604 ALL MSLP 542 0 0 1.2 -4.2 4.4
83738 -22.5 -44.5 440 ALL MSLP 543 0 0 3.3 -3.1 4.5
83970 -31.3 -50.9 5 ALL MSLP 409 0 0 1.3 -5.1 5.3
84390 -4.6 -81.3 90 ALL MSLP 141 0 0 1.1 4.0 4.2
84401 -5.2 -80.6 55 ALL MSLP 644 1 0 1.6 5.0 5.2
84425 -5.9 -76.1 184 ALL MSLP 132 0 0 1.3 4.4 4.6
84452 -6.8 -79.8 34 ALL MSLP 269 0 0 2.8 4.3 5.1
84455 -6.4 -76.4 282 ALL MSLP 488 0 0 1.8 5.9 6.2
84501 -8.1 -79.0 30 ALL MSLP 491 0 0 1.8 4.4 4.8
84531 -9.2 -78.5 21 ALL MSLP 132 0 0 1.1 4.1 4.3
84782 -18.1 -70.3 458 ALL MSLP 482 0 0 2.1 3.6 4.2
85365 -22.0 -63.7 645 ALL MSLP 347 1 0 3.1 3.8 4.9
85406 -18.4 -70.3 55 ALL MSLP 712 0 0 2.3 3.6 4.3
85577 -33.4 -70.7 520 ALL MSLP 714 0 0 3.0 -3.0 4.2
87222 -28.6 -65.8 454 ALL MSLP 722 1 0 2.6 -3.9 4.7
87311 -31.6 -68.4 598 ALL MSLP 720 0 0 3.2 -3.9 5.0
87416 -33.1 -68.4 653 ALL MSLP 704 1 0 2.7 -4.4 5.2
87418 -32.8 -68.8 704 ALL MSLP 708 0 0 3.2 -5.4 6.3
87436 -33.3 -66.3 713 ALL MSLP 719 0 0 2.2 -3.0 3.7
87509 -34.6 -68.4 748 ALL MSLP 704 3 0 2.5 -3.3 4.1
WMO REGION 4
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
71786 51.5 -116.3 1615 ALL MSLP 725 4 1 2.9 3.5 4.6
71826 66.2 -65.7 32 ALL MSLP 730 0 0 1.6 -3.5 3.8
72375 35.1 -11.2 2139 ALL MSLP 718 29 4 5.7 -1.0 5.8
72462 37.4 -105.9 2299 ALL MSLP 721 1 0 5.7 2.6 6.3
72576 42.8 -108.7 1694 ALL MSLP 130 0 0 2.9 3.9 4.8
76113 30.7 -111.7 419 ALL MSLP 163 1 1 1.8 -3.8 4.2
76220 29.0 -107.8 1870 ALL MSLP 539 49 9 3.7 7.5 8.4
76323 26.9 -105.7 1744 ALL MSLP 441 1 0 3.7 4.0 5.4
76571 21.9 -102.3 1874 ALL MSLP 260 0 0 3.7 3.3 4.9
76632 20.1 -98.7 2417 ALL MSLP 281 1 0 3.1 -5.7 6.5
76634 20.1 -98.4 2181 ALL MSLP 261 0 0 2.5 3.3 4.1
76680 19.4 -99.2 2303 ALL MSLP 303 0 0 2.2 -4.2 4.7
76762 17.5 -99.5 1865 ALL MSLP 403 0 0 1.5 3.9 4.2
76848 16.3 -92.1 1646 ALL MSLP 352 0 0 1.7 -3.9 4.2
78760 10.0 -84.8 3 ALL MSLP 179 0 0 1.4 3.4 3.6
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 212 0 0 0.7 3.2 3.2
WMO REGION 6
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
04208 74.0 -57.8 40 ALL MSLP 181 181 100 ** ** **
04270 61.2 -45.4 32 ALL MSLP 729 0 0 2.6 -3.0 4.0
04330 74.3 -20.2 44 ALL MSLP 603 0 0 2.2 -4.9 5.4
08226 40.7 -3.2 640 ALL MSLP 369 0 0 1.6 -5.8 6.0
40009 36.7 39.0 349 ALL MSLP 595 2 0 1.5 -3.1 3.4
40030 35.1 36.8 303 ALL MSLP 622 1 0 1.5 -3.8 4.1
WMO REGION ANTARCTICA
STN NO. LAT LONG HT(M) TIME ELEM NOBS NGE PGE SD BIAS RMS
89266 -72.2 -60.2 91 ALL MSLP 318 271 85 7.0 -7.1 9.9
89269 -64.8 -64.1 8 ALL MSLP 242 238 98 1.9 -1.4 2.2
89272 -75.0 -70.8 1395 ALL MSLP 531 509 96 5.7 -12.4 13.6
89377 -82.5 -174.5 55 ALL MSLP 350 2 1 4.0 3.9 5.6
89504 -72.0 2.5 1290 ALL MSLP 150 0 0 2.7 -4.9 5.5
89512 -70.8 11.8 102 ALL MSLP 722 9 1 2.9 -5.5 6.2
89514 -70.8 11.7 117 ALL MSLP 648 6 1 2.8 -5.5 6.2
89592 -66.6 93.0 35 ALL MSLP 727 1 0 2.8 -4.7 5.4
89611 -66.3 110.5 41 ALL MSLP 729 9 1 2.8 -4.2 5.0
89642 -66.7 140.0 43 ALL MSLP 700 16 2 3.3 -6.8 7.6
89768 -78.6 166.7 920 ALL MSLP 497 5 1 3.4 -3.9 5.1
89866 -77.4 163.7 120 ALL MSLP 463 1 0 3.2 -4.9 5.8
89869 -80.0 165.1 75 ALL MSLP 474 3 1 3.5 3.0 4.6
89879 -71.9 171.2 30 ALL MSLP 460 14 3 2.4 -10.4 10.7
