World Meteorological Organization

PROCESS FOR SUBMISSION, REVIEW AND APPROVAL OF THE IOM REPORTS

Instruments and Observing Methods (IOM) reports provide a consistent method for recording detailed information in addition to the core material found in the Guide to Instruments and Methods of Observation (WMO-No. 8), for specific audiences. They are important records of intercomparisons, field trials, specifications, and detailed analyses of metrological issues.

For a detailed description of the IOM publication process, please check:

Process for submission, review and approval of the IOM reports 

If you would like to have your work published as an IOM report, please download and fill out the following form:

IOM Report submission form 

And then, send the form to the WMO Secretariat via email: imop@wmo.int.

Reference

Keywords

Title

Author(s)

Notes

Report on the Fifth WMO Regional Pyrheliometer Comparison of RA II, held jointly with RA V

16-27 January 2023, Tsukuba, Japan

WMO Technical Conference on Meteorological and Environmental Instruments and Methods of Observation (TECO-2024) with the theme: “Measurements and new technologies for WMO priority initiatives.” 

Vienna, Austria, 23 - 26 September 2024

Conference proceedings (zip file)

Presentations and recordings from TECO-2024 (website)

IOM 116

TECO-2014

Papers and Posters presented at the WMO Technical Conference on Instruments and Methods of Observation, 
St. Petersburg, Russian Federation, 7 - 9 July 2014

WMO Library

IOM 114

AMDAR

AMDAR Onboard Software Functional Requirements Specification Version 1.0, 16 July 2013

WMO Library

IOM 113

Pyrheliometers

Third WMO Regional Pyrheliometer Comparison of RA II
Tokyo, 23 January to 3 February 2012

WMO Library

IOM 112

Pyrheliometers

Baltic Region Pyrheliometer Comparison 2012 
21 May - 1 June 2012, Norrköping, Sweden

WMO Library

IOM 111

Survey, RA II

RA II - Survey on the Surface, Climate, Upper-air Observations, and Quality Management 

WMO Library

IOM 110

Wind Profilers

Experiences of the Japan Meteorological Agency (JMA) with the Operation of Wind Profilers (2011)  

WMO Library

IOM 109

TECO-2012

Papers and Posters presented at the WMO Technical Conference on Instruments and Methods of Observation, 
Brussels, Belgium, 16 - 18 October 2012

WMO Library

IOM 108

Pyrheliometers

The International  Pyrheliometer Comparison - Final Report
Davos, Switzerland, 27 September to 15 October 2010

W. Finsterle (Switzerland), 2011

WMO Library

IOM 107
(TD 1580)

Radiosondes

WMO Intercomparison of High Quality Radiosonde Systems
Yangjiang, China, 12 July - 3 August 2010  (20 MB)

Clarification note on use of the report

WMO Library

IOM 106
(TD 1579)

Thermometer screens and
humidity measuring instruments

WMO Field Intercomparison of Thermometer Screens/Shields and Humidity Measuring Instruments
Final Report  (11 MB)
Appendices: 
- Appendix 1: Thermometer Screens (6 MB)  
- Appendix 2: Humidity Measuring Instruments (3 MB) Ghardaïa, Algeria, November 2008 -  October 2009

WMO Library

IOM 105
(TD 1557)

WMO-BIPM Workshop

Report onthe WMO-BIPM workshop on "Measurement Challenges for Global Observing Systems for Climate Change Monitoring - Traceability, Stability and Uncertainty"
Geneva, Switzerland, 30 March – 1 April 2010

WMO Library

IOM 104
(TD 1546)

TECO-2010

Papers and Posters presented at the WMO Technical Conference on Instruments and Methods of Observation, 
Helsinki, Finland, 30 August - 1 September 2010

WMO Library

IOM 103
(TD 1545)

RIC

Evaluation Scheme for Regional Instrument Centres and Other Calibration Laboratories            
English version: Evaluation Scheme v2.1(.xls)
Version française: Grille d'evaluation v2.2(.xls)

Jérôme Duvernoy (France), 2010

WMO Library

IOM 102
(TD 1544)

Solid Precipitation

CIMO Survey on National Summaries of Methods and Instruments for Solid Precipitation Measurement at Automatic Weather Stations

Rodica Nitu and Kai Wong (Canada), 2010

WMO Library

IOM 101
(TD 1543)

Calibration Laboratory

Guidance on Instrumentation for Calibration Laboratories, including Regional Instrument Centres

D. Groselj (Slovenia), 2010

WMO Library

IOM 100
(TD 1542)

Lightning Detection Systems

Evaluation of the Survey on Lightning Detection Systems - Report on Current Operational Networks

M. Dahoui (Morocco), 2010

WMO Library

IOM 99
(TD 1504)

Rainfall Intensity

WMO Field Intercomparison of Rainfall Intensity Gauges  (10.4 MB)
Vigna di Valle, Italy, October 2007 - April 2009

E. Vuerich, C. Monesi, L. Lanza, L. Stagi (all Italy), E. Lanzinger (Germany), 2009

WMO Library

IOM 98
(TD 1501)

Pyranometers

Sub-Regional Pyranometer Intercomparison of the RA VI members from South-Eastern Europe
Split, Croatia, 22 July to 6 August 2007

K. Premec (Croatia), 2009

WMO Library

IOM 97
(TD 1494)

Pyrheliometers

Second WMO Regional Pyrheliometer Comparison of RA II
Tokyo, 22 January to 2 February 2007

H. Sasaki (Japan), 2009

WMO Library

IOM 96
(TD 1462)

TECO-2008

Papers and Posters presented at the WMO Technical Conference on Instruments and Methods of Observation, 
St. Petersburg, Russian Federation, 27-29 November 2008

WMO Library

IOM 95
(TD 1433)

Radiosondes

Global criteria for tracing the improvements of radiosondes over the last decades

P. Jeannet (Switzerland), C. Bower (USA), B. Calpini (Switzerland), 2008

WMO Library

IOM 94
(TD 1354)

TECO-2006

Papers and Posters presented at the WMO Technical Conference on Instruments and Methods of Observation, 
Geneva, Switzerland, 4-6 December 2006

WMO Library

IOM 93
(TD 1382)

Instruments

Instrument Development Inquiry (Seventh edition)

 T. Prager (Hungary), J.P. van der Meulen (Netherlands), 2006

WMO Library

IOM 92
(TD 1340)

GPS Water Vapour

National/Regional Procedures of GPS Water Vapour Networks and Agreed International procedures

S. De Haan (The Netherlands), 2006

WMO Library

IOM 91
(TD 1320)

Pyrheliometers

The International  Pyrheliometer Comparison - Final Report
Davos, Switzerland, 26 September to 14 October 2005

W. Finsterle (Switzerland), 2006

WMO Library

IOM 90
(TD 1314)

Radiosondes

The WMO Intercomparison of  GPS Radiosondes - Final Report
Alcantâra, Brazil, 20 May to 10 June 2001

R. da Silveira, G. F. Fisc, L.A. Machado, A.M. Dall'Antonia Jr., L.F. Sapucci, D. Fernandes, R. Marques (all Brazil), J. Nash (UK), 2006  

WMO Library

IOM 89
(TD 1309)

Remote Sensing

Operational Aspects of Different Ground-based Remote Sensing Observing Techniques for Vertical Profiling of Temperature, Wind, Humidity and Cloud Structure

E. N. Kadygrov (Russian Federation), 2006  

WMO Library

IOM 88
(TD 1308)

Radars

Training Material on Weather Radar Systems

E. Büyükbas, O. Sireci, A. Hazer, I. Temir, A. Macit, C. Gecer  (all Turkey), 2006

WMO Library

IOM 87
(TD 1307)

AWOS

Training Material on Automated Weather Observing Systems

E. Büyükbas, L. Yalçin, Z. Dag, S. Karatas (all Turkey), 2006   

WMO Library

IOM 86
(TD 1306)

Metrology

Training Material on Metrology and Calibration: Measurement Theory
 

J. Duvernoy, A. Dubois (all France), 2006  

WMO Library

IOM 85
(TD 1305)

Radiosondes

The WMO Radiosonde Humidity Sensor Intercomparison - Final Report of Phase I and Phase II
Phase I: Russian Federation, 1995 - 1997
Phase II: USA, 8-26 September 1995

Phase I: A. Balagurov, A. Kats, N. Krestyannikova (all Russian Federation)
Phase I: F. Schmidlin (USA), 2006

WMO Library

IOM 84
(TD 1304)

Rainfall Intensity

The WMO Laboratory Intercomparison of  Rainfall Intensity Gauges - Final Report                
France, The Netherlands, Italy, Sep.2004 - Sept. 2005

L. Lanza, L. Stagi (all Italy), M. Leroy, C. Alexandropoulos (all France), W. Wauben (The Netheralnds), 2006

WMO Library

IOM 83
(TD 1303)

Radiosondes

The WMO Intercomparison of  Radiosonde Systems - Final Report 
Vacoas, Mauritius, 2-25 February 2005

J. Nash, R. Smout, T. Oakley (all UK), B. Pathack (Mauritius), S. Kurnosenko (USA), 2006

WMO Library

IOM 82
(TD 1265)

TECO-2005

Papers and Posters presented at the WMO Technical Conference on Instruments and Methods of Observation, 
Bucharest, Romania, 4-7 May 2005

WMO Library

IOM 81
(TD 1250)

Urban Observations

Initial Guidance to Obtain Representative Meteorological Observations at Urban Sites 

T. Oke (Canada), 2006

WMO Library

IOM 80
(TD 1197)

Radiosondes

WMO Catalogue of Radiosondes and Upper-Air Wind Systems in use by Members in 2002; and
Compatibility of Radiosonde Geopotential Measurements for the period 1998 to 2001 

J. Elms (UK), 2003

WMO Library

IOM 79
(TD 1196)

Radars

Operational Aspects of Wind Profiler Radars 

J. Dibbern, D.Engelbarg, U.Goersdorf, V.Lehmann, H.Steinhagen (Germany); N.Latham, J.Nash, T.Oakley (UK); H.Richner (Switzerland), 2003

WMO Library

IOM 78
(TD 1160)

AWS

Algorithms Used in Automatic Weather Stations - Evaluation of Questionnaire

M.D. Gifford (USA), 2003

WMO Library

IOM 77
(TD 1159)

Road Measurements

Road Managers and Meteorologists over Road Meteorological Observations - The result of questionnaires

J.M. Terpstra (Netherlands) and
T.Ledent (Belgium), 2003

WMO Library

IOM 76
(TD 1153)

Radiosondes

WMO Intercomparison of GPS Radiosondes - Executive Summary

Alcantara, Brazil, 20 May-10 June 2001

R.B. da Silveira, G. Fisch, L.A.T. Machado, A.M. Dall´Antonia Jr., L.F. Sapucci, D. Fernandes (all Brazil), and J. Nash (UK), 2003

WMO Library

IOM 75
(TD 1123)

TECO-2002

Papers and Posters Presented at the WMO Technical Conference on Instruments and Methods of Observation, PDF of proceedings,

Bratislava (Slovakia), 23-25 September 2002  

WMO Library

IOM 74 (TD 1028)

TECO-2000

Papers Presented at the WMO Technical Conference on Instruments and Methods of Observation,

Beijing (China), 23-27 October 2000

WMO Library

IOM 73 (TD 887)

Present weather

WMO Intercomparison of Present Weather Sensors/Systems -
Canada and France, 1993-1995
Final Report - Appendices

M. Leroy (France), C. Bellevaux (France) and J.P. Jacob (France), 1998

WMO Library

IOM 72 (TD 886)

Radiosondes

Report by the Rapporteur on Radiosonde Compatibility Monitoring
Part 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 1997

T. Oakley (United Kingdom), 1998

WMO Library

IOM 71 (TD 878)

Instruments

Instrument Development Inquiry (Sixth edition)

J.P. van der Meulen (Netherlands), 1998

WMO Library

IOM 70 (TD 877)

TECO-1998

Papers Presented at the WMO Technical Conference on Instruments and Methods of Observation,

Casablanca ( Morocco), 4-12 May 1998

WMO Library

IOM 69 (TD 874)

Radars

Weather Radars used by Members

T. Mammen (Germany), 1998

WMO Library

IOM 68 (TD 873)

Surface Obs.

Guidance Material on the Choice of Meteorological Instruments for Surface Observations Suitable for Use in Developing Countries

J.B. Odero (Kenya), 1998

WMO Library

IOM 67 (TD 872)

Precipitation

WMO Solid Precipitation Measurement Intercomparison - Final Report

B.E. Goodison (Canada), P.Y.T. Louie (Canada) and D. Yang (China), 1998

WMO Library

IOM 66 (TD 871)

Thermometers

Recent Changes in Thermometer Screen Designs and their Impact

A. Barnett (UK), D.B. Hatton (UK) and D.W. Jones (UK), 1998

WMO Library

IOM 65 (TD 862)

AWS

Guidance on Automatic Weather Systems and their Implementation
Part I: Guidance Specifications (Functional) for a General Purpose AWS
Part II: Implementation and User Training Considerations

Observation and Engineering Branch, Australian Bureau of Meteorology, 1997

WMO Library

IOM 64 (TD 861)

Pyrheliometers

Tercera Comparación Regional de la OMM de Pirheliómetros Patrones Nacionales de la AR III - (Informe Final)
Centro Regional de Radiación, Santiago de Chile, 24 de Febrero al 7 Marzo de 1997

Manuel Vargas Muñoz (Chile), 1997

WMO Library

IOM 63 (TD 860)

Remote sensors

Operational Use of Ground-based Remote Sensors: A Review

D.W. Beran (USA), 1997

WMO Library

IOM 62 (TD 859)

Instruments

WMO Wind Instrument Intercomparison

P. Gregoire (France) and G. Oualid (France), 1997

WMO Library

IOM 61 (TD 842)

Road Obs.

Road Meteorological Observations

R.E.W. Pettifer (UK) and J. Terpstra (Netherlands), 1997

WMO Library

IOM 60 (TD 771)

Radiosondes

Description and User Guide for the Radiosonde Comparison and Evaluation Software Package (RSKOMP - Version 3/Version 4)

S. Kurnosenko (Russian Fed.) and T. Oakley (UK), 1996

WMO Library

IOM 59 (TD 742)

Radiosondes

WMO International Radiosonde Comparison - Phase IV, Tsukuba (Japan), 1993 - Final Report.

S. Yagi (Japan), A. Mita (Japan) and N. Inoue (Japan), 1996

WMO Library

IOM 58 (TD 670)

AWS

Papers presented at the International Workshop on Experiences with Automatic Weather Stations on Operational Use within National Weather Services, Vienna (Austria), 1995

WMO Library

IOM 57 (TD 588)

TECO-94

Papers presented at the WMO Technical Conference on Instruments and Methods of Observation, Geneva (Switzerland), 1994

WMO Library

IOM 56 (TD 587)

Radiosondes

Report by the Rapporteur on Radiosonde Compatibility Monitoring
Part A - WMO Catalogue of Radiosondes and Upper-air Wind Systems in Use by Members
Part B - Compatibility of Radiosonde Geopotential Measurements 1990, 1991, 1992

T. Oakley (United Kingdom), 1993

WMO Library

IOM 55 (TD 589)

Instruments

Siting and Exposure of Meteorological Instruments

J. Ehinger (Switzerland), 1993

WMO Library

IOM 54 (TD 578)

Instruments

Instruments Development Inquiry (fifth edition)

 By J.P. van der Meulen (Netherlands), 1993 

WMO Library

IOM 53 (TD 572)

Pyrheliometers

Segunda Compariación de la OMM de Pirheliómetros Patrones Nacionales AR III,

Buenos Aires, 1991

M. Ginzburg (Argentina), 1992

WMO Library

IOM 52 (TD 571)

Radars

Results of the Working Group on Weather Radars
Part I: Severe Weather Recognition
Part II: Utilization of Doppler Radars for Monitoring Tropical Cyclones as one Element of the Global Monitoring System

Part I: G.G. Shchukin (Russian Fed.), and Part II: Hisao Ohno (Japan), 1993

WMO Library

IOM 51 (TD 570)

Lightning

Overview of Real-time Lightning Detection Systems for use by Meteorological Services

R.L. Holle (USA) and R.E. López (USA), 1993

WMO Library

IOM 50 (TD 541)

Radiosondes

Historical Changes in Radiosonde Instruments and Practices

D.J. Gaffen (USA), 1993

WMO Library

IOM 49 (TD 462)

TECO-92

Papers presented at the WMO Technical Conference on Instruments and Methods of Observation,

Vienna (Austria), 1992

WMO Library

IOM 48 (TD 328)

Precipitation

International Workshop on Precipitation Measurements 
St. Moritz (Switzerland), 1989

WMO Library

IOM 47 (TD 452)

AWS

Reports of the CIMO Working Group on Surface Measurements -
Guidance on the Establishment of Algorithms for Use in Synoptic Automatic Weather Stations - Processing of Surface Wind Data

D. Painting (UK), 1991

WMO Library

IOM 46 (TD 474)

Barometer

The WMO Automatic Digital Barometer Intercomparison,

De Bilt (Netherlands), 1989

J.P. van der Meulen (Netherlands), 1992

WMO Library

IOM 45 (TD 310)

Instruments

Analysis of Instrument Calibration Methods used by Members

H. Döring (Germany), 1989

WMO Library

IOM 44 (TD 345)

Pyrheliometers

First WMO Regional Pyrheliometer Comparison of RA IV, Ensenada (Mexico), 1989

I. Galindo (Mexico)

WMO Library

IOM 43 (TD 308)

Pyrheliometers

First WMO Regional Pyrheliometer Comparison of RA II/RA V, Tokyo (Japan), 1989

WMO Library  

IOM 42

Sunshine

WMO Automatic Sunshine Duration Measurement Comparison, Hamburg (Germany), 1989

not published

IOM 41 (TD 401)

Visibility

First WMO International Intercomparison of Visibility Measurements,

United Kingdom, 1989

D.J. Griggs (UK), D.W. Jones (UK), M.Ouldridge (UK) and W.R. Sparks (UK)

WMO Library

IOM 40 (TD 451)

Radiosondes

WMO International Radiosonde Comparison - Phase III, Dzhambul (USSR), 1989

A. Ivanov, A. Kats, S. Kurnosenko, N. Zaitseva (all USSR) and J. Nash (UK)

WMO Library

IOM 39 (TD 313)

Precipitation

Catalogue of National Standard Precipitation Gauges

B. Sevruk (Switzerland) and S. Klemm (Germany), 1989

WMO Library

IOM 38 (TD 316)

Hygrometers

WMO International Hygrometer Intercomparison,

Oslo (Norway), 1989

J. Skaar, K. Hegg, T. Moe, K. Smedstud (all Norway)

WMO Library

IOM 37 (TD 309)

Radars

Information on Weather Radars used by WMO Members

M. Gilet (France), 1989

WMO Library

IOM 36 (TD 344)

Radiosondes

Compatibility of Radiosonde Geopotential Measurements

M. Kitchen (United Kingdom), 1988

WMO Library

IOM 35 (TD 303)

TECIMO-IV

Papers presented at the Fourth WMO Technical Conference on Instruments and Methods of Observation,

Brussels (Belgium), 1989

WMO Library

IOM 34 (TD 289)

Psychrometers

WMO Assmann Aspiration Psychrometer Intercomparison, Potsdam (German Democratic Republic), 1987

D. Sonntag (German Dem. Rep.), 1989

WMO Library

IOM 33 (TD 222)

TECO-1988

Papers presented at the WMO Technical Conference on Instruments and Methods of Observation,

Leipzig (German Democratic Rep.), 1988

WMO Library

IOM 32 (TD 217)

Ceilometers

WMO International Ceilometer Intercomparison,

United Kingdom, 1986

D.W. Jones, M. Ouldridge and D.J. Painting (all United Kingdom), 1988

WMO Library

IOM 31

Gustiness

The Measurement of Gustiness at Routine Wind Stations 
- A Review

A.C.M. Beljaars (Netherlands), 1987

WMO Library

IOM 30 (TD 195)

Radiosondes

WMO International Radiosonde Comparison, UK, 1984 and USA, 1985

J. Nash (United Kingdom) and F. Schmidlin (USA), 1987

WMO Library

IOM 29 (TD 312)

Radiosondes

WMO International Radiosonde Intercomparison - Phase II, Wallops Island (USA), 1985

F. Schmidlin (USA)

WMO Library

IOM 28 (TD 174)

Radiosondes

WMO International Radiosonde Comparison - Phase I, Beaufort Park (UK), 1984

A. H. Hooper (United Kingdom), 1986

WMO Library

IOM 27 (TD 176)

Radiosondes

WMO Catalogue of Radiosondes and Upper-Air Wind Systems in Use by Members (1986)

WMO Library

IOM 26

Instruments

Lectures presented at the Workshop for Instrument Specialists, Buenos Aires (Argentina), 1984  (Spanish only)

WMO Library

IOM 25

Precipitation

Papers presented at the Workshop on the Correction of Precipitation Measurements,

Zürich, Switzerland, 1985

WMO Library

IOM 24 (TD 231)

Instruments

Instruments Development Inquiry - Fourth Edition

E. Prokhorov (USSR), 1987

WMO Library

IOM 23 (TD 51)

TECIMO-III

Keynote papers presented at the Third WMO Technical Conference on Instruments and Methods of Observation,

Ottawa (Canada), 1995

WMO Library

IOM 22 (TD 50)

TECIMO-III

Papers presented at the WMO Technical Conference on Instruments and Methods of Observation,

Ottawa (Canada), 1985

WMO Library

IOM 21 (TD 175)

Aerologic

Algorithms for Automatic Aerological Soundings

A.H. Hooper (United Kingdom), 1986

WMO Library

IOM 20 (TD 177)

AWS

Stations Automatiques à Faible Coût

P. Viton (France), 1986

WMO Library

IOM 19 (TD 230)

AWS

Some General Considerations and Specific Examples in the Design of Algorithms for Synoptic Automatic Weather Stations

D.T. Acheson (USA), 1987

WMO Library

IOM 18 (TD 112)

Instruments

Guidance Material on Meteorological Instruments Suitable for Use in Developing Countries

E. S. Engawi (Saudi Arabia), 1986

WMO Library

IOM 17 (TD 38)

Precipitation

International Comparison of National Precipitation Gauges with a Reference Pit Gauge

B. Sevruk and W. R. Hamon, 1984

WMO Library

IOM 16 (TD 146)

Pyranometers
Sunshine

Comparison of Pyranometers and Electronic Sunshine Duration Recorders of RA VI,

Budapest (Hungary), 1984

G. Major (Hungary), 1986

WMO library

IOM 15

TECEMO

Papers presented at the WMO Technical Conference on Instruments and Cost-effective Meteorological Observations, Noordwijkerhout (Netherlands), 1984

WMO Library

IOM 14

Instruments

Summary Results of a 1978 Survey of Calibration Facilities and of Tests and Evaluation of Instruments

out of print

IOM 13

Balloons

The Use of Hydrogen for Inflation of Meteorological Balloons, 1982

WMO Library

IOM 12

Laser sensing

Meteorological Observations by Laser Indirect Sensing Techniques

A.O. van Gysegem (Belgium), 1982

WMO Library

IOM 11

Radiosondes

WMO Catalogue of Radiosondes in Use by Members, 1982

WMO Library

IOM 10

Psychrometer

Radiation Effects on the WMO Reference Psychrometer in the Field

R.G. Wylie and T. Lalas (Australia),
1981

WMO Library

IOM 9

TECIMO-II

Papers presented at the Second WMO Technical Conference on Instruments and Methods of Observation, Mexico City, Mexico, 1981

WMO Library

IOM 8

Radars

Report on Meteorological Radars

G.A. Clift, 1981

WMO Library

IOM 7

Navaids

The Meteorological Use of Navaid Systems - A brief technical assessment

A. Lange (Finland), 1981

WMO Library

IOM 6

Aerodrome

Preliminary Analysis of a Questionnaire on Aerodrome Meteorological Measurements

M.M. Etienne (Belgium), 1981

WMO Library

IOM 5

Radiosondes

WMO Catalogue of Radiosondes in Use by Members, 1981

WMO Library

IOM 4

Satellite

WMO Equipment Survey – Meteorological Satellite Ground-based Receiving Equipment, 1980

WMO Library

IOM 3

Intercomparison

Lower Tropospheric Data Compatibility. Low-level Intercomparison Experiment,

USA, 1979

WMO Library

IOM 2

Instruments

Instrument Development Inquiry (Third Edition), 1980

WMO Library

IOM 1

Automation

Automated Meteorological Systems. Papers presented at the Technical Conference on Evolution and Standardization of Observing Techniques in Light of Automation,

Norrköping (Sweden), 1980

WMO Library

WMO Library

WMO-No. 449

Evaporimeter

The CIMO International Evaporimeter Comparison, Final Report, 1976

WMO Library