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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 ...WMO Field Intercomparison of Thermometer Screens/Shields and Humidity Measuring Instruments: Ghardaïa, Algeria, November 2008 – October 2009
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World Meteorological Organization (WMO) ; D. Bousri ; M. Leroy ; M. Mezred
Published by: WMO ; 2011The 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 knowledge on the performance characteristics and operational factors of radiation screens/shields and humidity sensors. This included especially the reliability, accuracy and long-term stability of tested humidity sensors and the estimation of impact of radiation, wind speed, precipitation on humidity measurements inside the different screens/shields. An International Organizing Committee was set up to determine and agree on the rules of the intercomparison and to support its preparation and execution. The IOC was also tasked to agree on the procedures used for the evaluation of the results and to review and agree on their presentation in the final report of the intercomparison. This report presents in a detailed manner the procedures followed for the data acquisition and the analysis and a comparison of the performance of the instruments relative to the reference. It also contains datasheets for each of the participating instruments, which provide exhaustive information on their performances throughout the intercomparison period, and as a function of different parameters. A number of recommendations were drawn from the results and are directed to users (such as the type of shields to be preferred in desert conditions), to manufacturers, as well as to CIMO for its future activities and conduction of the follow-up intercomparison in arctic environment.
Collection(s) and Series: WMO/TD- No. 1579; IOM Report- No. 106
Language(s): English
Format: CD, DVD, Digital (Free)Tags: Observations ; Hydrometeorological instrument ; Humidity ; Measure ; Instruments and Methods of Observation Programme (IMOP)
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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 ...Published by: WMO ; 2010
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. Therefore CIMOXIV requested the Expert Team on Regional Instruments Centres (RICs), Quality Management Systems and Commercial Initiatives to develop a recommended set of calibration equipment suited for developing countries. This IOM Report, prepared by a member of the Expert Team, Mr Drago Groselj provides a concise overview of various techniques for calibration. The main surfacebased observing parameters are overviewed: temperature, humidity and pressure. This report describes primary, secondary, working and traveling reference standards. Their performance characteristics are briefly reviewed and their application in the calibration processes is described. An assessment of their advantages and limitations is also provided. The information contained in this publication will assist specialists from RICs, as well as from NMHSs, in the modernization of present calibration systems by providing help in the selection of modern calibration equipment.
Collection(s) and Series: WMO/TD- No. 1543; IOM Report- No. 101
Language(s): English
Format: CD, DVD, Digital (Free)Tags: Observations ; Meteorological instrument ; Hydrometeorological instrument ; Automated Weather Observing System (AWOS) ; Global Space-based Inter-Calibration System (GSICS) ; WMO Integrated Global Observing System (WIGOS) ; OBS - Personnel performing instrument calibrations ; Instruments and Methods of Observation Programme (IMOP)
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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 ...Published by: WMO ; 2010
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 of their services and to verify the traceability of the basic meteorological variables. This publication describes the first Evaluation Scheme developed for Regional Instrument Centre’s regular assessment. It was developed by a member of the CIMO Expert Team on Regional Instrument Centre, Mr Jérôme Duvernoy. This report explains how to use the Evaluation Scheme for Regional Instrument Centres and Other Calibration Laboratories that consists in an Excel Sheet. It describes briefly the background of the Evaluation Scheme, the user manual and provides some guidance on the ISO 17025 standard “General requirements for the competence of testing and calibration laboratories”. The Evaluation Scheme itself is based on the Terms of Reference of RICs and on the ISO 17025 standard on which they rely. The Evaluation Scheme has been prepared in a way to help users in maintaining or strengthening their quality management system. It contains three main parts in the form of a questionnaire, results and improvement advices. This IOM Report can be considered as a tool that is useful for the regular assessment of RICs, but also as a help to establish the quality system of a RIC or of a calibration laboratory. The main benefits of correctly implementing ISO/IEC 17025 in a RIC or a NMHSs’ calibration laboratory are the continuous improvement of calibration quality and laboratory effectiveness, which also improve the data quality of observing parameters exchanged within WIGOS, as well as the improved national and regional recognition of the laboratory.
Collection(s) and Series: WMO/TD- No. 1545; IOM Report- No. 103
Language(s): English
Format: CD, DVD, Digital (Free)Tags: Precipitation forecasting ; Instruments and Methods of Observation Programme (IMOP)
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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 ...CIMO Survey on national summaries of methods and instruments for solid precipitation measurement at automatic weather stations
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Published by: WMO ; 2010
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 observation of solid precipitation, snowfall and snow depth, at automatic, unattended stations in cold climate (polar and alpine). In that context, CIMO tasked the Expert Team on SurfaceBased Instrument Intercomparisons and Calibration Methods (ETSBII& CM) to conduct this work. This IOM Report, prepared by a member of the Expert Team, Ms Rodica Nitu as Lead author, and by Ms Kai Wong, provides the result of the analysis of the survey on National summaries of methods and instruments for solid precipitation measurement at automatic weather stations that was performed in 2008 to document and review the current methods, instruments and challenges of automatic solid precipitation measurements. The survey was prepared in a way to reflect the transition from manual to automatic observation of precipitation and to provide information on the extent of use of automation for measuring precipitation, the parameters monitored, the instruments used and their metadata, and the current development work taking place for improving the measurement of precipitation. This publication facilitates a better understanding of the global configuration of precipitation measurement and lays the ground for a proposed WMO intercomparison of instruments measuring solid precipitation.
Collection(s) and Series: WMO/TD- No. 1544; IOM Report- No. 102
Language(s): English
Format: CD, DVD, Digital (Free)Tags: Precipitation forecasting ; Instruments and Methods of Observation Programme (IMOP)
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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 ...Published by: WMO ; 2010
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 the analysis of the survey that was performed in 2009 to document and review the current operational lightning detection networks used by Members. It describes briefly the scope of the survey, the subsequent analysis approach and focuses on the detailed analysis. It provides a number of findings and recommendations from the author. The survey was prepared so as to reflect the current status of the operational lightning detection networks, and report on their strengths and weaknesses, including coverage, accuracy, reliability and cost effectiveness. It comprises six sections covering the network and data management aspects.
Collection(s) and Series: WMO/TD- No. 1542; IOM Report- No. 100
Language(s): English
Format: CD, DVD, Digital (Free)Tags: Observations ; Instruments and Methods of Observation Programme (IMOP)
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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.Permalink![]()
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IOM Report, 104. Papers presented at the WMO Technical Conference on Meteorological and Environmental Instruments and Methods of Observation (TECO-2010)
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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 ...Permalink![]()
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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.Permalink![]()
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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.Permalink![]()
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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 ...Permalink![]()
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IOM Report, 96. Papers presented at the WMO Technical conference on meteorological and environmental instruments and methods of observation (TECO-2008)
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IOM Report, 89. Operational Aspects of Different Ground-based Remote Sensing Observing Techniques for Vertical Profiling of Temperature, Wind, Humidity and Cloud Structure
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