WORLD METEOROLOGICAL ORGANIZATION COMMISSION FOR INSTRUMENTS AND METHODS OF OBSERVATION ABRIDGED FINAL REPORT OF THE FOURTH SESSION Tokyo, 4th -15th October 1965 PRICE: Sw. fro 10.50 I WMO-No. 185. RP. 68 I Secretariat of the World Meteorological Organization - Geneva • Switzerland 1966 , C" CONTENTS Page List of representatives attending the session • VI Agenda IX General sunllllary of the work of the session 1 Resolutions adopted by the ses-sion 26 Final Session No. No. 1 2.1/1- Rapporteur on duration of leaf wetness 26 ~ 3/1 Working Group on Measurement of Precipitation 26 3 4/1 Working Group on Evaporation Measurement 27 4 5/1 Working Group on Hygrometry • • • • • • • 27 5 5/2 Rapporteur on measurement of temperature 28 6 7/1 Working Group on Instruments and Methods of Observation on Aerodromes • • • • • 29 7 8/1 Working Group on Use of Meteorological Radar for Aeronautical Purposes • • . • • • • • • • • • • • 30 8 9/1 Working Group on Radiation Instruments and Qbservations for General Use . • • • . • . • • • . • • • • • 31 9 9/2 Working Group on Special Radiation Instruments and Observations • • • • • • • • • 32 10 10.1/1 Working _Group on Radiosonde and Radiowind Measurements 32 11 10.2/1 Rapporteur on radiowlnd observations on board merchant sllips . • . • . • • • . • • 33 12 10.4/1 Rapporteur on radiosonde and radiowind computation tecl'm.iques • • • • • • • • • • • • • • • • • • 34 13 10.5/1 Rapporteur on instrumental aspects of dropsonde observations .. • 35 14 10.7/1 Working Group on Sensors and Telemetry for Meteorological Rockets ••• 35 15 10.8/1 Rapporteur on meteorological instrumental requirements for supersonic transport aircraft operations • • • • • • 16 12/1 Working Group on Measurement of Atmospheric Electricity • 17 13/1 Rapporteur on lower troposphere soundings • 18 14/1 Rapporteur on accuracy of measurements 19 16/1 Executive Working Group of-CIMO •••••• 20 18/1 rtapPQrteur on measurement of atmospheric radioactivity and Working Group on Standardization and Int~rcoropar~son of Radioactivity Measurements ••••••••••••••• 39 IV CONTENTS Final Session (continued) No. No. 21 19/1 Working Group on Observations in Polar Regions • • • 40 22 23/1 Working Group on Training in Instruments and Methods of Observation. •••••••••••••••• 40 23 24/1 Revision of the resolutions and reoommendations of CIMO 41 Recommendations adopted by the seqsion 42 Final Session No. No. 1 9/1 National and regional radiation centres. 42 2 9/2 World radiation centre 42 3 9/3 Comparisons of pyrheliometers 43 4 10.1/1 Comparison of radiosondes • . 44 5 11/1 Radio frequency allocations 44 6 13/1 Lower troposphere soundings . 46' 7 17/1 Comparisons of instruments 46 8 17/2 Inter-regional comparisons of barometers 47 9 21/1 Revision of Te.ohnical Regulations • . 47 10 22/1 Terms of reference of the Commission 49 11 24/1 Revision of resolutions of the Executive Committee based on previous recommendations of CIMO . 49 Annexes I Annex to paragraph 5.1 of the General Summary Reference hygrometers covering a wider range than obtainable with the psychrometer . ..f. • • • • . • • • . • . • • • 51 II Annex to paragraph 8.3 of the General Summary Note on the feasibility of determining the height of convective cloud tops • . • " . 60 III Annex to paragraph 20.2 of the General Summary Proposal for a standard layout for chapters of'the Guide to Meteorological Instrument and Observing Practices • • • • • 62 IV Annex to paragraph 20.3 of the General Summary Amendments to the Guide to Meteorological Instrument and Observing Practices ............................ V Annex to Recommendation 1 (CIMO-IV) Regional and national radiation centres . VI Annex to Recommendation 4 (CIMO-IV) Accuracy requirements stated by technical commissions . 69 CONTENTS v Annexes (continued) VII Annex to Recommendation 7 (CIMO-IV) Programme of international comparisons of meteorological instruments. 70 List of documents 71 VI LIST OF REPRESENTATIVES ATTENDING THE SESSION L Officers of the session L. S. Mathur president M. Yoshitake vice-president 2. Representatives of Members of WMO A.G. Maenhout principal delegate Belgium M.E. Etienne delegate L.J. Koenigsfeld delegate J.M. dos Santos principal delegate Brazil K.E. Potter principal delegate British Caribbean Territories and British Guiana H.H. Bindon principal delegate Canada R.E. Vockeroth delegate M. Clerebaut principal delegate Congo (Dem.Rep. of) A. Kadima delegate J.W. O'Byrne adviser V. VliisaHi principal delegate Finland Y. I. Toivola delegate V. Marc principal delegate France C. Perrin de Brichambaut delegate A. Rouaud delegate H. Treussart delegate M. Hinzpeter principal delegate Germany (Federal Republic of) J. Grunow delegate L.S. Mathur principal delegate India Miss A.M. Mani delegate M. Thaller principal delegate Israel G. Cena principal delegate Italy M. Yoshitake principal delegate Japan M. Ito delegate N. Arizumi delegate S. Ohta delegate T. Kitaoka delegate M. Sanuki adviser I. Oyama adviser H. Fujiwara expert I. Imai expert J. Kobayashi expert K. Otani expert I. Shimizu expert K. UChikawa expert LIST OF REPRESENTATIVES Ch. Kim principal delegate Korea B. Azmy principal d~legate Morocco C.M. Wierda principal delegate Netherlands J.H. Rietman delegate J. Knudsen principal delegate Norway R.L. Kintanar principal delegate Philippines H. de la Cruz delegate H.M. Siraj principal delegate Saudi Arabia A.A. Salih principal delegate Sudan M. Aronsson principal delegate Sweden S. Suwanpong principal delegate Thailand B.G. Rozdestvenski principal delegate U.S.S.R. N.P. Rusin delegate V.I. Shlyakhov delegate Miss E.S. Bocieva interpreter Mrs. N.Ju. Vajl interpreter A.L. Maidens principal delegate United Kingdom N.E. Rider delegate W.R. Linton delegate Ch. Harmantas principal delegate U.S.A. V.D. Rockney delegate V.S. Hardin delegate R.M. Marchgraber delegate D.T. Acheson adviser L.M. Polan adviser V. Figuera principal delegate Venezuela A. Garant6n observer 3. Observers (a) ~Dt~~=~9Y§~9W§Dt~1_g~g~!~~~!9D§ O. Suschny International Atomic Energy Agency (b) 9~h§~_g~g~Di~~~igD§_ H. Hatakeyama Pacific Scienoe Assooiation A. Kimpara International Scientifio Radio Union D.E. Bertin InternaUonal Air Transport Assooiation T. ';['akeda International Air Transport Assooiation 4. Representatives of WMO Seoretariat K. Le,nglo Representative of Secretary-General O.M. Ashford Permanent Seoretary of CIMO 5. Seoretariat of the session M. Yoshitake Chief M. Ito Exeoutive Seoretary S. Tajima Exeoutive Seoretary VIII LIST OF REPRESENTATIVES Secretariat of the session (continued) S. Ono Assistant Secretary (Administration) K. Takeuchi Assistant Secretary (Documentation) N~ Suzuki Assistant Secretary (Documentation) Y. Oka Assistant Secretary (Social events) I "'" IX AGENDA Agenda Relevant Res. Rec. item Documents No. 1. Organization of the session 1.1 Opening of the session 1.2 Report on credentials 1.3 Adoption of the agenda I, Add, I, 2 2, Add. I, 2, 3 1.4 Election of a vice-president for the session 1.5 Establishment of committees .1.6 Programme of work of the session 2. Reports 2.1 Report by the president of 31, Add. 1, 2; 70 1 the Commission 2.2 Reports by chairmen of 4; 5; 6; 7; 8; 10; working groups 11; 17; 18; 19; 24; 40; 46; 50; 52 2.3 Reports by rapporteurs 3; 55 3. Precipitation 24; 29; 46; 81 2 4. Evaporation 6, Corr. 1; 68 3 5. Surface temperature and humidity 17; 28; 62; 101 4,5 6. Barometer comparisons 43; 56. Add. 1; 69 7. Instruments and methods of II, Add. 1, Corr. 1; 6 observation on aerodromes 51; 63; 94 8. Uses of radar in meteorology 30; 45; 52; 64; 83 7 Radiation 4, Add. 1; 40; 41; 8,9 I, 2, 3 42; 61; 80 10. Upper-air measurements 10.1 Radiosondes 19; 36; 58; 60; 92 10 4 10.2 Radiowind measurements on 7; 76 11 board merchant ships 10.3 Radiosonde hygrometry 50; 57; 77 x AGENDA Agenda Relevant item Documents Res. Rec. No. 10.4 Computation techniques 79 12 10.5 Dropsonde observations 27; 67; 13 10.6 Horizontal soundings 16; 66 10.7 Meteorological rockets 32; 93 14 10.8 Instrumentation for supersonic 48;·54; 78 15 transport (SST) aircraft 11. Radio-frequency allocations 23, Add. 1; 88 5 12. Atmospheric electricity 18; 74 16 13. Lower troposphere soundings 8, Add. 1·• 75 17 6 14. Accuracy of measurements 5; 25; 35; 38; 18 47; 84 15. Instrument standards 14; 26; 95 16. Instrument development 10, Add. 1; 33; 39; 19 44; 49; 51; 65~ 71 17. Comparisons of instruments 20, Add. 1; 53; 98 7, 8 18. Atmospheric radiQactivity 3; 34; 59; 87 20 19. Observations in Antarctica 55; 72 21 20. Guide to Meteorological Instrument 22, Add. 1; 97 and Observing Practices 21. Technical Regulations 21, Add. 1, 2·• 99 9 22. Terms of reference of the 12, Add. 1·• 86 10 Commission 23. Training in instrumehts and methods 13;. 85 22 of observation 24. Review of previous resolutions and 15; 96 23 11 recommendations of the Commission and relevant Executive Committee decisions 25. Establishment of working groups 9; 73; 91 26. Election of officers 82; 90 27. Date and place of the fifth session 28. Scientific lectures and discussions 37; 100 GENERAL SUMMARY OF THE WORK OF THE SESSION 1. ORGANIZATION OF THE SESSION (Agenda item 1) At the invitation of the Government of Japan, the fourth session of the Commission for Instruments and Methods of Observation (CIMO) was held in Tokyo from 4 to 15 October 1965. The meeting took place at the Takanawa Prince Hotel, where excellent accommodation and equip­ ment was provided for carrying out the work of the session. The Commission held six plenary meetings and the proceedings were greatly facili­ tated by the simultaneous interpretation in English and French both during the plenaries and during the meetings of the two main working committees. 1.1 Opening of the session (Agenda item 1.1) The session opened at 11.00 a.m.