Documents available under this collective title
Published by: WMO ; 2021
Collection(s) and Series: IOM Report- No. 136
Format: CD, DVD, Digital (Free)World Meteorological Organization (WMO) ; A. Lilja, S. Cohn, C. Fierz, J. Gueusquin, T. Konzelmann, P-W. S. Lau and A. Webb - WMO, 2021Published by: WMO ; 2021
Collection(s) and Series: IOM Report- No. 135
Format: CD, DVD, Digital (Free)WMO, 2021This report presents the results of an interlaboratory comparison (ILC) with participation of all Regional Instrument Centres (RICs) in WMO Regional Associations (RAs) II and V, using the methodology and experience from the ILC in RA VI in 2016. The ILC was coordinated by RIC Tsukuba (Japan) with support and input from RIC Ljubljana and the University of Ljubljana, Faculty of Electrical Engineering (Slovenia). The results of the ILC in RA II and RA V clearly demonstrate the high capabilities of these RICs, particularly in the domains of temperature and humidity calibration. Some areas requirin ...Published by: WMO ; 2021
Report on Interlaboratory Comparison in the field of Temperature, Humidity and Pressure in the WMO Regional Association II, V and VI (MM-ILC-2018-THP-2)
This report presents the results of an interlaboratory comparison (ILC) with participation of all Regional Instrument Centres (RICs) in WMO Regional Associations (RAs) II and V, using the methodology and experience from the ILC in RA VI in 2016. The ILC was coordinated by RIC Tsukuba (Japan) with support and input from RIC Ljubljana and the University of Ljubljana, Faculty of Electrical Engineering (Slovenia). The results of the ILC in RA II and RA V clearly demonstrate the high capabilities of these RICs, particularly in the domains of temperature and humidity calibration. Some areas requiring improvement have been identified, mainly in the domain of pressure calibration, thereby the results will assist the laboratories concerned to identify and correct their operations. The results of the ILC have also supported the participating laboratories in maintaining or applying for accreditation according to ISO/IEC 17025. Overall, this is a very positive outcome of the ILC with the goal of improving measurement quality being achieved.
Notes: K. Nakashima, F. Barcenas, I. Dollery, D. Groselj, A. Merlone, X. Nan, J. Bojkovski and G. Beges
Collection(s) and Series: IOM Report- No. 134
Format: Digital (Free)Published by: WMO ; 2019
Tests, Comparisons and Operational Performance of the Water Vapor Sensing Systems (WVSS-II): CIMO Expert Team on Aircraft-based Observations
Collection(s) and Series: IOM Report- No. 133
Format: Digital (Free)Published by: WMO ; 2018
The 2018 WMO/CIMO Technical Conference on Meteorological and Environmental Instruments and Methods of Observation (CIMO TECO-2018): “Towards fit-for-purpose environmental measurements”
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Collection(s) and Series: IOM Report- No. 132
Format: Digital (Free)This report describes the intercomparison in detail: the instruments, the participants, the experimental setup, method and procedure, the data analysis technique used and the results. It is clear from the results that all of the participating instruments have been well maintained and remained stable since the previous intercomparison, which augers well for all radiation measurements within RA II and RA V. All participants were able to return home with newly derived WRR reduction factors for their instruments.PermalinkPermalinkThe subject of this report is evaluation of the interlaboratory comparison in the field of measurement of temperature, humidity and pressure. The interlaboratory comparison was held within the framework of the MeteoMet 2 project, in the scope of proficiency testing scheme organized by the University of Ljubljana, Faculty of Electrical Engineering, Laboratory of Metrology and Quality (UL-FE/LMK), except pressure part. All the analysis were done in accordance with accredited procedures.PermalinkThe Solid Precipitation Intercomparison Experiment (SPICE) was conducted as an internationally coordinated project, initiated and guided by the Commission for Instruments and Methods of Observation (CIMO) of the World Meteorological Organization (WMO). The SPICE field experiments took place between 2013 and 2015, with a preparatory stage during the winter of 2012/13.
SPICE was carried out as a major international effort, and has been remarkable for the diversity of organizations which hosted SPICE tests, contributed with instruments, and were engaged in the data analysis and the derivat ...PermalinkIt this report, METEO-Cert and its application is described. The METEO-Cert process assigns qualitative flags to each station and its instruments. Those qualitative flags provide valuable information on the applicability of the measured data and help to identify potential improvement of the station’s exposure.PermalinkPermalinkPermalinkPermalinkThis document has been prepared in the frame of WMO study SSA-2604-14/REM/PEX, for which the objective is to assess currently developing and future communications and technology impacts on AMDAR.PermalinkPermalinkThis report is that document, as authored by Dr Nash, in all its original detail. Starting with the existing version of the CIMO Guide (2010 update) Dr Nash revised that information, primarily to include the additional understanding gained from the Yangjiang intercomparison. At the same time, though, he added a wealth of further specialist knowledge, gained from his protracted involvement in WMO CIMO activities over more than thirty years, and in particular from his participation in all eight CIMO international radiosonde intercomparisons, commencing with the first, held at Bracknell in 1983.PermalinkPermalinkPermalinkPermalinkThe report enables a WMO Member country to determine where it stands in relation to other WMO Members in regard to its use of dangerous or obsolete instrumentation, and offers some ideas on how to replace these instruments by suggesting possible alternatives.PermalinkPermalinkThis document provides a functional specification for AMDAR onboard software, which can be utilized by avionics software developers to build avionics software applications for AMDAR that will efficiently meet WMO standards and requirements for reporting of meteorological data from the aircraft platform utilizing aviation communications protocols and infrastructure.PermalinkThis document provides a functional specification for AMDAR onboard software, which can be utilized by avionics software developers to build avionics software applications for AMDAR that will efficiently meet WMO standards and requirements for reporting of meteorological data from the aircraft platform utilizing aviation communications protocols and infrastructure.PermalinkThis report describes this latest RA II intercomparison: the participants (from WRC, Japan, Hong Kong, the Republic of Korea, and Thailand), the intercomparison itself and the results. That all participating instruments except one were found to be well-maintained and highly accurate is a credit to all those who participated, and we can now be confident that solar radiation measurements made in these Asian region countries are reliable and dependable.PermalinkThis report presents the results from a sub-Regional Pyrheliometer Intercomparison that was held at the Regional Radiation Centre at Norrköping, at the kind invitation of Sweden, for Members of Baltic states of WMO Regional Association VI. The opportunity was taken during the exercise to include a pyranometer intercomparison. The participating countries were Austria, Finland, Lithuania, Poland, Russia, Sweden and WRC (Switzerland).PermalinkThis publication reports on the results of a survey on the surface, climate and upper-air observations and quality management in Regional Association II (Asia). The survey was conducted as one of the activities for the Pilot Project to Enhance the Availability and Quality Management Support for National Meteorological and Hydrological Services in Surface, Climate and Upper-air Observations, established during the 14th Session of Regional Association II (Asia), held in Tashkent, Uzbekistan in December 2008PermalinkThis publication discusses the Japanese Meteorological Agency’s (JMA) operational experience with Doppler mode radar wind profilers in Japan, to provide guidance to other WMO Members planning to implement wind profiler networks.PermalinkPermalinkThe results presented in this report are based on the measurements carried out during the three weeks assigned to the IPC-XI. The favorable weather conditions allowed to acquire a large number of calibration points for most participating instruments. Cloudy and overcast days were used for technical preparations and training of participants as well as for a the IPC-XI symposium and Course on Radiation Measurement. A Saharan Dust Event (SDE) a ected the measurements during several days starting October 8 th . Analyzing the e ect of the SDE on di erent types of instruments led to interesting ndi ...PermalinkWorld Meteorological Organization (WMO) ; Oakley T.; Vömel Holger; et al. - WMO, 2011 (WMO/TD-No. 1580)The present report includes a detailed analysis of the QRS intercomparisons, a specific analysis of the SSI group, and draws conclusions and recommendations that are key information for the manufacturers, the NMHS as well as the scientific and climate community. Results show that unprecedented performances have been achieved with QRS while the expected performances to be reached with respect to the GRUAN specifications still require more research. This work is an essential contribution to the WMO Integrated Global Observing Systems (WIGOS) to improve services to society by increasing the data ...PermalinkThe 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 ...PermalinkUsers 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 ...PermalinkThe 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 ...PermalinkThis 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 ...PermalinkThis 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 ...PermalinkWorld 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.PermalinkPermalinkThe 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 ...PermalinkThis report presents the results from the SubRegional Pyranometer Intercomparison that was held for the Members of SouthEastern Europe at the kind invitation of Croatia.PermalinkThis 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.PermalinkThis 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 ...PermalinkPermalinkPermalinkPermalinkPermalinkPermalinkWorld Meteorological Organization (WMO) ; Kats A.; Krestyannikova N.; et al. - WMO, 2006 (WMO/TD-No. 1305)PHASE I: Laboratory Test
- Central Aerological Observatory (Dolgoprudny, Russian Federation, June 1995 - June 1997): A. Balagurov, A. Kats, N. Krestyannikova (Russian Federation)
PHASE II: Field Test
- NASA Wallops Flight Facility (Virginia, United States, 8 - 26 September 1995): F. Schmidlin (United States)PermalinkPermalinkPermalinkWorld Meteorological Organization (WMO) ; van der Meulen J.P. - WMO, 2006 (7th edition; WMO/TD-No. 1382)PermalinkPermalinkWorld Meteorological Organization (WMO) ; Fisch Gilberto F.; Machado Luiz Augusto T.; et al. - WMO, 2006 (WMO/TD-No. 1320)PermalinkWorld Meteorological Organization (WMO) ; Fisch Gilberto F.; Machado Luiz Augusto T.; et al. - WMO, 2006 (WMO/TD-No. 1314)PermalinkPermalinkWorld Meteorological Organization (WMO) ; Leroy Michel; Alexandropoulos C.; et al. - WMO, 2006 (WMO/TD-No. 1304)PermalinkPermalink1 CD-ROMPermalinkPermalinkPermalinkPermalinkPermalinkPermalink1 CD-ROMPermalinkPermalinkPart A: WMO Catalogue of Radiosondes and Upper-air Wind Systems in Use by Members (1998)
Part B: Compatibility of Radiosonde Geopotential Measurements 1995, 1996 and 1997PermalinkPermalinkPermalinkRecent changes to thennometer screen design and a heightened awareness of global climate changes have focused the mind of the meteorological world, in particular climatologists, on the effects these changes are bringing about. There is concern that any changes that take place could influence the homogeneity of the temperature records. The purpose of this report is to examine the recent published work on instrument screens, intercomparisons and theoretical studies and to make recommendations on how to proceed with ensuring continuity in the meteorological records. The practice of temperature sc ...PermalinkPermalinkThe WMO Solid Precipitation Measurement Intercomparison was started in the northern hemisphere winter of 1986/87. The field work was carried out in 13 Member countries for seven years. The Intercomparison was the result of Recommendation 17 of the ninth session of the Commission for Instruments and Methods of Observation (CIMO-IX). As in previous WMO intercomparisons of rain gauges, the main objective of this test was to assess national methods of measuring solid precipitation against methods whose accuracy and reliability were known. It included past and current procedures, automated systems ...PermalinkPermalinkPermalinkWorld Meteorological Organization (WMO) ; Jones D.W.; Bureau of Meteorology - WMO, 1997 (WMO/TD-No. 862)This report, prepared under the supervision ofDr R. Canterford (Australia), Chairman ofthe above Working Group, is the culmination ofthe work of several meteorologists and physicists working in the Australian Bureau ofMeteorology. The major part is based on a previous document on Automatic Weather Stations (AWS) by Mr. E. lesson, formerly of the Bureau of Meteorology and CIMO Rapporteur in this field. This was expanded to include, in Part I, the latest material on AWS technology and, in Part IT, guidance for the implementation ofnetworks and training ofusers ofdata produced by automatic statio ...PermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPart A - WMO Catalogue of Radiosondes and Upper-air Wind Systems in Use by Members.
Part B - Compatibility of Radiosonde Geopotential Measurements 1990, 1991, 1992PermalinkThis publication reports on the results of the fifth edition of the Instrument Development Inquiry. As stated in Res. 4 of CIMO-X, the Commission for Instruments and Methods of Observation (CIMO) had decided to circulate to all W.M.O. Members a new questionnaire on instrument development. A total number 143 completed questionnaires from 23 countries were returned.PermalinkPart I: Severe Weather Recognition
Part II: Utilization of Doppler Radars for Monitoring Tropical Cyclones as one Element of the Global Monitoring SystemPermalinkPermalinkPermalinkPart II, p.49PermalinkPermalinkWorld Meteorological Organization (WMO) ; Ministerie van Verkeer en Waterstaat Koninklijk (Nederlands) - WMO, 1992 (WMO/TD-No. 474)The first WMO Automatic Digital Barometer Intercomparison was held in De Bilt, the Netherlands at the Royal Netherlands Meteorological Institute from begin 1989 to July 1991. Thirty-three instruments of 14 different designs were entered by nine Members of WMO 1). This report contains a description of the procedures followed, the data acquisition, the data analysis, and a technical description of the principles of the instruments. Finally the results of the intercomparison are given in a general table and the result per instrument in detail. The report also includes recommendations for operatio ...PermalinkPermalinkWorld Meteorological Organization (WMO) ; Kats A.; Kurnosenko Sergey; et al. - WMO, 1991 (WMO/TD-No. 451)PermalinkWorld 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 ...PermalinkPermalinkThe 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.PermalinkThe 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 ...PermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkWorld Meteorological Organization (WMO) ; WMO Working Group on Instruments and Methods of Observation for Surface Data - WMO, 1987 (4th edition; WMO/TD-No. 231)PermalinkPermalinkPermalinkThe purpose of this report is to collect together for convenient reference all coefficients and procedures that arise from the quantitative message requirements. In addition, empirical algorithms are presented for the remaining (qualitative) tasks. Except where stated, they have been in operational use for several years. Although drawn from specific systems, the algorithms have been generalised and are given in sufficient detail to facilitate their use in other systems. These algorithms will serve as a standard of comparison for alternative procedures that might be contemplated.PermalinkWorld Meteorological Organization (WMO) ; WMO Working Group on Instruments and Methods of Observation for Surface Data - WMO, 1986 (WMO/TD-No. 112)PermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalink