Report
on the Quality of Land Surface Observations
in Region V
July-December 2007
Report No. 22
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 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 299 0 0 0.7 3.6 3.6 98132 20.8 121.8 124 ALL MSLP 400 0 0 1.3 3.8 4.0
Table 1. List of land surface stations reporting suspect observations of mean sea level pressure over the period July-December 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
JULY to DECEMBER 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 JUL to DEC 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 553 1 0 2.2 -7.2 7.5
63330 13.5 39.5 2070 ALL MSLP 297 290 98 6.7 9.8 11.6
63333 11.1 39.7 1903 ALL MSLP 418 1 0 2.5 5.2 5.8
63402 7.7 36.8 1725 ALL MSLP 188 9 5 2.9 -10.9 11.3
63451 8.7 39.0 1900 ALL MSLP 535 0 0 2.9 3.9 4.9
63478 5.9 43.6 295 ALL MSLP 251 0 0 2.1 5.1 5.5
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 540 5 1 1.7 -6.7 6.9
40754 35.7 51.3 1191 ALL MSLP 694 2 0 2.7 -3.7 4.6
40757 35.5 53.4 1171 ALL MSLP 695 0 0 2.7 -3.4 4.4
40791 33.6 56.9 711 ALL MSLP 690 0 0 2.3 -3.1 3.9
40818 31.2 52.7 2004 ALL MSLP 697 1 0 3.3 -3.6 4.8
40835 30.4 50.8 738 ALL MSLP 627 2 0 1.9 -4.2 4.6
40848 29.5 52.6 1491 ALL MSLP 704 1 0 3.1 -3.4 4.6
40853 29.2 56.6 2258 ALL MSLP 685 3 0 2.7 -3.0 4.1
40854 29.1 58.4 1067 ALL MSLP 672 1 0 2.2 -4.6 5.1
40859 29.0 53.7 1383 ALL MSLP 690 0 0 2.7 -4.2 5.0
44203 51.1 99.7 1583 ALL MSLP 705 10 1 4.3 3.6 5.6
44212 49.8 92.1 936 ALL MSLP 730 31 4 4.4 3.4 5.6
44217 48.3 89.5 2148 ALL MSLP 719 60 8 4.4 3.4 5.5
44224 48.8 90.1 1928 ALL MSLP 713 73 10 5.4 3.0 6.2
44225 48.7 98.3 1723 ALL MSLP 727 81 11 5.1 4.7 6.9
44230 49.6 102.0 1236 ALL MSLP 727 2 0 2.3 3.2 3.9
44275 46.8 98.1 2255 ALL MSLP 725 8 1 5.1 1.8 5.4
44284 46.7 100.1 2117 ALL MSLP 726 6 1 4.4 3.0 5.4
48925 20.7 102.0 550 ALL MSLP 304 2 1 4.6 -5.4 7.1
51379 44.0 89.6 794 ALL MSLP 722 0 0 2.9 3.3 4.4
52533 39.8 98.5 1478 ALL MSLP 733 0 0 2.9 3.2 4.4
52652 38.9 100.4 1483 ALL MSLP 734 2 0 3.9 3.8 5.5
56287 30.0 103.0 629 ALL MSLP 734 0 0 2.5 3.3 4.1
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 123 0 0 2.0 -4.6 5.0
80315 3.0 -75.3 443 ALL MSLP 253 0 0 2.2 -3.0 3.7
82287 -2.9 -41.6 22 ALL MSLP 306 0 0 1.0 -5.0 5.1
82353 -3.2 -52.2 74 ALL MSLP 489 0 0 0.9 -3.5 3.6
82586 -5.2 -39.3 212 ALL MSLP 490 0 0 2.0 -4.0 4.4
82704 -7.6 -72.7 170 ALL MSLP 470 1 0 1.6 -4.8 5.1
82861 -8.3 -49.3 157 ALL MSLP 485 0 0 1.2 -3.5 3.7
83264 -12.2 -56.5 415 ALL MSLP 491 1 0 1.1 3.0 3.2
83358 -15.8 -54.4 450 ALL MSLP 492 2 0 2.3 -8.0 8.3
83388 -15.1 -42.8 604 ALL MSLP 502 0 0 1.2 -4.1 4.3
84390 -4.6 -81.3 90 ALL MSLP 151 0 0 1.2 4.2 4.4
84401 -5.2 -80.6 55 ALL MSLP 674 0 0 1.7 6.3 6.5
84425 -5.9 -76.1 184 ALL MSLP 138 0 0 1.6 5.3 5.5
84452 -6.8 -79.8 34 ALL MSLP 659 0 0 1.6 3.3 3.7
84455 -6.4 -76.4 282 ALL MSLP 545 1 0 2.0 6.0 6.3
84501 -8.1 -79.0 30 ALL MSLP 681 0 0 1.7 5.0 5.2
84531 -9.2 -78.5 21 ALL MSLP 143 0 0 1.0 4.7 4.8
84628 -12.0 -77.1 13 ALL MSLP 693 0 0 1.5 3.0 3.4
84782 -18.1 -70.3 458 ALL MSLP 687 0 0 2.3 3.3 4.0
85210 -16.3 -58.4 124 ALL MSLP 333 0 0 1.2 3.1 3.4
85365 -22.0 -63.7 645 ALL MSLP 331 0 0 3.5 4.5 5.7
85406 -18.4 -70.3 55 ALL MSLP 716 0 0 2.3 4.0 4.6
85574 -33.4 -70.8 474 ALL MSLP 717 0 0 2.9 -3.1 4.2
85836 -43.6 -71.8 277 ALL MSLP 162 0 0 1.6 6.2 6.4
87222 -28.6 -65.8 454 ALL MSLP 707 0 0 2.8 -3.4 4.4
87311 -31.6 -68.4 598 ALL MSLP 726 3 0 3.3 -3.4 4.7
87416 -33.1 -68.4 653 ALL MSLP 634 3 0 3.0 -4.0 5.0
87418 -32.8 -68.8 704 ALL MSLP 709 4 1 3.3 -5.1 6.1
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 354 0 0 1.8 -3.6 4.0
71786 51.5 -116.3 1615 ALL MSLP 732 0 0 2.6 3.5 4.4
71826 66.2 -65.7 32 ALL MSLP 732 0 0 1.5 -3.6 3.9
71920 57.3 -107.1 495 ALL MSLP 563 74 13 7.5 2.1 7.7
72375 35.1 -11.2 2139 ALL MSLP 728 31 4 5.5 -1.5 5.7
72376 35.2 -111.8 2192 ALL MSLP 727 1 0 4.6 3.0 5.5
72462 37.4 -105.9 2299 ALL MSLP 686 1 0 5.6 4.0 6.8
76055 31.0 -114.8 440 ALL MSLP 481 0 0 1.9 -3.2 3.7
76225 28.6 -106.1 1435 ALL MSLP 645 1 0 3.4 -3.3 4.7
76323 26.9 -105.7 1744 ALL MSLP 602 2 0 3.7 3.8 5.3
76632 20.1 -98.7 2417 ALL MSLP 235 0 0 3.2 -5.4 6.3
76680 19.4 -99.2 2303 ALL MSLP 277 0 0 2.1 -3.4 4.0
76726 18.9 -99.2 1618 ALL MSLP 305 1 0 3.4 -4.4 5.5
76848 16.3 -92.1 1646 ALL MSLP 338 0 0 1.7 -3.7 4.1
78707 15.2 -87.1 670 ALL MSLP 347 1 0 1.4 3.5 3.8
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 299 0 0 0.7 3.6 3.6
98132 20.8 121.8 124 ALL MSLP 400 0 0 1.3 3.8 4.0
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 704 0 0 2.6 -3.1 4.0
08094 42.1 -0.3 554 ALL MSLP 414 0 0 1.6 -3.6 4.0
08226 40.7 -3.2 640 ALL MSLP 276 0 0 1.7 -5.4 5.7
11204 46.8 12.8 665 ALL MSLP 398 0 0 3.8 3.8 5.4
37531 42.0 44.1 590 ALL MSLP 355 3 1 2.1 3.4 4.0
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 561 0 0 2.5 -3.9 4.6
89262 -66.9 -60.9 17 ALL MSLP 720 11 2 5.2 2.5 5.7
89269 -64.8 -64.1 8 ALL MSLP 349 348 100 0.0 10.3 10.3
89272 -75.0 -70.8 1395 ALL MSLP 697 697 100 ** ** **
89345 -89.7 -148.8 620 ALL MSLP 655 637 97 6.2 -11.7 13.1
89377 -82.5 -174.5 55 ALL MSLP 599 7 1 3.3 6.9 7.7
89504 -72.0 2.5 1290 ALL MSLP 580 0 0 3.3 -3.4 4.7
89512 -70.8 11.8 102 ALL MSLP 731 2 0 2.3 -5.4 5.9
89592 -66.6 93.0 35 ALL MSLP 729 2 0 2.6 -4.3 5.0
89611 -66.3 110.5 41 ALL MSLP 735 2 0 2.9 -3.7 4.7
89642 -66.7 140.0 43 ALL MSLP 716 9 1 3.2 -6.9 7.6
89768 -78.6 166.7 920 ALL MSLP 685 8 1 3.0 -4.9 5.7
89864 -74.9 163.7 80 ALL MSLP 681 4 1 3.4 -4.1 5.4
89866 -77.4 163.7 120 ALL MSLP 677 16 2 4.0 -5.9 7.1
89868 -79.9 170.0 60 ALL MSLP 363 0 0 2.9 -4.1 5.1
89879 -71.9 171.2 30 ALL MSLP 630 53 8 2.6 -9.5 9.8
