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IOM Report, 106. WMO Field Intercomparison of Thermometer Screens/Shields and Humidity Measuring Instruments : Ghardaïa, Algeria, November 2008 – October 2009
The WMO Combined Intercomparison of Temperature Screens/Shields in Conjunction with Humidity Measuring Instruments was carried out in Ghardaïa, Algeria from November 2008 to October 2009, at the kind invitation of the Algerian Meteorological Service and under the leadership of CIMO. This intercomparison allowed testing the performance of the instruments in desert conditions, in a dry, hot and dusty environment. It was planned to carry out a follow-up intercomparison of similar instruments in an arctic environment at a later stage. The main objectives of this intercomparison were to gain knowle ...
IOM Report, 101. Guidance on Instrumentation for Calibration Laboratories, including Regional Instrument Centres
Users of meteorological observations have increasing needs for high quality meteorological and hydrological data. The traceability of these data to the International System of Units (SI) standards is needed to ensure their quality and to meet the users’ requirements. Regional Instrument Centres, as well as NMHSs calibration laboratories are essential in ensuring data quality by providing calibration of the standards and traceability to SI. CIMOXIV recognized that RICs needed guidance on how to build calibration laboratories and purchase calibration equipment to strengthen their capabilities. T ...
IOM Report, 103. Evaluation Scheme for Regional Instrument Centres and Other Calibration Laboratories
The calibration of instruments and the traceability of meteorological measurements to the International Standard (SI) of units are crucial to ensure the quality of meteorological observations and to meet the users’ requirements. Regional Instrument Centres (RICs) play a key role in this context, by providing calibration services to other Members of their Region. In view of the need to ensure the quality of the services provided by the RICs, and the need for strengthening of RICs, the WMO Executive Council requested CIMO to develop a mechanism for their continuous evaluation to ensure quality o ...
IOM Report, 102. CIMO Survey on national summaries of methods and instruments for solid precipitation measurement at automatic weather stations
This publication reports on the results of the CIMO survey, initiated in 2008, on the current methods, instruments and challenges for the measurement of solid precipitation at automatic weather stations. The current survey is the third in its category. It was built on the two previous surveys that were conducted by CIMO 10 and 20 years ago. Since then, the automatic stations have been providing an increased percentage of precipitation data, snow water equivalent, and depth of snow on the ground. The CIMO, at its 14th session, initiated this review to assess the methods for measurement and obse ...
IOM Report, 100. Evaluation of the Survey on Lightning Detection Systems - Report on Current Operational Networks
This publication reports on the results of the CIMO survey on lightning detection systems. This survey was the first in its category. It was initiated by the CIMO in its 14th intersession period as part of a review of the current operational lightning detection systems networks used by Members, to assess the need and possibility to organize an intercomparison of such systems. In that context, CIMO charged the Expert Team on Remote Sensing UpperAir Technology and Techniques to conduct this work. This IOM Report, prepared by a member of the Expert Team, Mr Mohamed Dahoui provides the results of ...
IOM Report, 105. Measurement challenges for global observation systems for climate change monitoring : traceability, stability and uncertainty
World Meteorological Organization (WMO) ; Bureau International des Poids et Mesures (BIPM) - WMO, 2010 (WMO/TD-No. 1557)The WMO-BIPM workshop on ‘Measurement Challenges for Global Observation Systems for Climate Change Monitoring: Traceability, Stability and Uncertainty’ was held at the WMO Headquarters from 30 March to 1 April 2010, and brought together over 120 scientists active in long term measurements
relevant to climate change monitoring and metrologists responsible for developing standards as references to which such measurements could be traceable.
IOM Report, 99. WMO Field Intercomparison of Rainfall Intensity Gauges
The WMO Field Intercomparison of Rainfall Intensity Gauges was carried out in Vigna di Valle, Italy from October 2007 to April 2009, at the kind invitation of the Italian Meteorological Service. This intercomparison is following up on the Laboratory Intercomparison of Rainfall Intensity Gauges. CIMOXIV recommended that welldefined and accepted reference instruments and procedures were needed for the field intercomparison. CIMOXIV agreed that such reference might be based on a set of high quality devices applying different measuring techniques and had adopted a recommendation to that effect. Th ...
IOM Report, 98. Sub-Regional Pyranometer Intercomparison of the RA VI members from South-Eastern Europe
This report presents the results from the SubRegional Pyranometer Intercomparison that was held for the Members of SouthEastern Europe at the kind invitation of Croatia.
IOM Report, 97. Second WMO Regional Pyrheliometer Comparison of RA II
This report gives information about the Regional Pyrheliometer Comparison of the World Meteorological Organization (WMO) Regional Association (RA) II, held from 22 January to 2 February 2007 in Tsukuba, Japan with the participation of experts and pyrheliometers from China, Hong Kong, the Republic of Korea, Japan and the World Radiation Centre (WRC) in Davos, Switzerland.
IOM Report, 95. Global criteria for tracing the improvements of radiosondes over the last decades
This report represents the deliverable of the action initiated at the First Session of the Expert Team on UpperAir Systems Intercomparisons (ETUASI), Geneva, Switzerland, 2004: „To elaborate global criteria for tracing the improvements, based on previous intercomparisons and recent radiosondes development“. In the report, different approaches are identified with the objective to define these criteria, and the following method was selected as the most appropriate one: Time evolution of selected statistical parameters reported in the different IOM international radiosonde comparisons organized b ...
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