Collection details
IOM Report
Linked authorities :
|
Documents available under this collective title


![]()
IOM Report, 41. The first WMO intercomparison of visibility measurements: final report
World Meteorological Organization (WMO) ; Jones D.W.; Ouldridge M.; et al. - WMO, 1990 (WMO/TD-No. 401)The first WMO International Visibility Intercomparison was held in the United Kingdom at Royal Air Force Finningley (WMO No 03360) from 17 October 1988 to 11 May 1989. Twenty-five visibility instruments of 18 different designs were entered by seven Members and comprised a backscatter meter, forward scatter meters and long and short baseline transmissometers. This report contains a complete description of the conduct of the Intercomparison, the part icipat ing instruments, the data recorded, and the principles, techniques and results of the analysis. The characteristics of each instrument are s ...World Meteorological Organization (WMO) ; D.W. Jones ; M. Ouldridge ; W.R. Sparks
Event: Event: WMO International Visibility Intercomparison 1st session (1988-1989; United Kingdom)
Published by: WMO ; 1990The first WMO International Visibility Intercomparison was held in the United Kingdom at Royal Air Force Finningley (WMO No 03360) from 17 October 1988 to 11 May 1989. Twenty-five visibility instruments of 18 different designs were entered by seven Members and comprised a backscatter meter, forward scatter meters and long and short baseline transmissometers. This report contains a complete description of the conduct of the Intercomparison, the part icipat ing instruments, the data recorded, and the principles, techniques and results of the analysis. The characteristics of each instrument are summarised under the headings: stability, contamination susceptibility, overall performance, performance in precipitation, and any additional comments. Also presented is a comparison with local visual estimates of MOR. An estimate is given of the uncertainty in the measurements of MOR produced by the instruments included in the Intercomparison and these results are discussed with reference to the stated accuracy requirements of WMO Technical Commissions. In addition a detailed case study of the spatial and temporal structure of MOR in conditions of low MOR is presented. The report also includes recommendations both for the specification of accuracy reqUirements and the operational use of the different types of instrument studied.
Collection(s) and Series: WMO/TD- No. 401; IOM Report- No. 41
Language(s): English
Format: Digital (Free), Hard copy (ill.)Tags: Hydrometeorological instrument ; Instruments and Methods of Observation Programme (IMOP)
Add tag
No review, please log in to add yours !
Published by: WMO ; 1989
Collection(s) and Series: WMO/TD- No. 310; IOM Report- No. 45
Language(s): English
Format: Digital (Free), Hard copyTags: Hydrometeorological instrument ; Instruments and Methods of Observation Programme (IMOP)
Add tag
No review, please log in to add yours !
![]()
IOM Report, 39. Catalogue of national standard precipitation gauges
The present report contains tables with information on the national standard PGs of the WMO Members, including cross-sections of PGs, a brief review of the problems of accuracy of precipitation measurement. and of the results of wind tunnel tests regarding aerodynamical characteristics of PGs and correction procedures of the wind-induced error, wetting and evaporation.Published by: WMO ; 1989
The present report contains tables with information on the national standard PGs of the WMO Members, including cross-sections of PGs, a brief review of the problems of accuracy of precipitation measurement. and of the results of wind tunnel tests regarding aerodynamical characteristics of PGs and correction procedures of the wind-induced error, wetting and evaporation.
Collection(s) and Series: WMO/TD- No. 313; IOM Report- No. 39
Language(s): English
Format: Digital (Free), Hard copy (ill.)Tags: Precipitation forecasting ; Instruments and Methods of Observation Programme (IMOP)
Add tag
No review, please log in to add yours !
![]()
IOM Report, 38. WMO International Hygrometer Intercomparison
The WMO International Hygrometer Intercomparison which was held at the Norwegian Meteorological Institute (DNMI) from February 1987 to March 1989, included 20 different humidity sensors, some with 2 or 3 equivalent units. All together 34 sensors were compared, representing products from 15 manufacturing firms. Eleven Member countries participated in the project. The instruments were exposed in a grass-covered area to the south of the institute buildings, -some sensors in open air, some inside an instrument screen specially constructed for the purpose. The instruments were exposed in accordance ...Published by: WMO ; 1989
The WMO International Hygrometer Intercomparison which was held at the Norwegian Meteorological Institute (DNMI) from February 1987 to March 1989, included 20 different humidity sensors, some with 2 or 3 equivalent units. All together 34 sensors were compared, representing products from 15 manufacturing firms. Eleven Member countries participated in the project. The instruments were exposed in a grass-covered area to the south of the institute buildings, -some sensors in open air, some inside an instrument screen specially constructed for the purpose. The instruments were exposed in accordance with instructions received and/or decisions made by an International Organizing Committee (QC). Sampling of data was accomplished by an EDPsystem at the site. Logging took place every 6th second during last minute of every 10 minutes interval, continuously. The 10 signals from each of the sensors thus received during each 10 minutes interval were linearized, averaged and stored in a raw data file.Other meteorological variables were also monitored simultanously, averaged and stored. Since no absolute reference was available, the hygrometers were compared with Relative Reference Values (RRV), constructed in accordance with methods established by the QC, and described in the Report. For analysis of the data, accomplished by a separate EDP-system, several methods were employed, as, for example, comparison with RRV in relation to temperature, to relative humidity, to certain weather phenomena and time (for possible drift investigation) etc. In addition, intercomparison between sensors of same type, between reference values and between values recorded inside and outside the instrument screen have been carried out. Graphs and tables have been prepared for all the sensors included. The Report also contains short descriptions and general performance of the instruments included, and summary tables of result.
Collection(s) and Series: WMO/TD- No. 316; IOM Report- No. 38
Language(s): English
Format: Digital (Free), Hard copy (ill.)Tags: Observations ; Meteorological instrument ; Instruments and Methods of Observation Programme (IMOP)
Add tag
No review, please log in to add yours !
Published by: WMO ; 1989
Collection(s) and Series: WMO/TD- No. 309; IOM Report- No. 37
Language(s): English, French
Format: Digital (Free), Hard copyTags: Radar meteorology ; Instruments and Methods of Observation Programme (IMOP)
Add tag
No review, please log in to add yours !
![]()
![]()
IOM Report, 35. Papers presented at the fourth WMO Technical Conference on Instruments and Methods of Observation (TECIMO-IV)
PermalinkPermalinkPermalinkPermalinkPermalink![]()
![]()
IOM Report, 34. WMO Assmann Aspiration Psychrometer Intercomparison (Potsdam, German Democratic Republic, 1987): final report
Permalink![]()
![]()
IOM Report, 33. Papers presented at the WMO Technical Conference on Instruments and Methods of Observation (TECO-1988)
PermalinkPermalink![]()
![]()
IOM Report, 29. WMO International Radiosonde Intercomparison Phase II, 1985, Wallops Island, Virginia USA, 4 February 1985-15 March 1985
Permalink![]()
![]()
IOM Report, 19. Some general considerations and specific examples in the design of algorithms for synoptic automatic weather stations
Permalink