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Regional Radiation CENTER Tokyo in the WMO RA-II

Regional Radiation CENTER Tokyo in the WMO RA-II. Osamu Ijima Radiation Section, Atmospheric Environment Division, Global Environment and Marine Department, Japan Meteorological Agency (JMA). Oct. 2010, IPC-XI, Davos, Switzerland. RRC Regional Association (RA) II (Asia).

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Regional Radiation CENTER Tokyo in the WMO RA-II

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  1. Regional Radiation CENTER Tokyo in the WMO RA-II Osamu Ijima Radiation Section, Atmospheric Environment Division, Global Environment and Marine Department, Japan Meteorological Agency (JMA) Oct. 2010, IPC-XI, Davos, Switzerland

  2. RRC Regional Association (RA) II (Asia) • JMA (Tokyo) has been serving as RRC in the WMO Regional Association (RA) II (Asia) since 1965. Region II ASIA MAP

  3. Activities of RRC RA-II Tokyo No.1 - History and main activities - 1964 Pyrheliometer Intercomparison : India - Japan (Pune, India) 1965Regional Radiation Centre Establish (RA II Res.20, CIMO IV Rec.1,3,9) 1968 Pyrheliometer Intercomparison : Thailand - Japan (Tsukuba, Japan) 1970 Join in IPC-III (WRC/Davos, Switzerland) 1975 Join in IPC-IV (WRC/Davos, Switzerland) Pyrheliometer Intercomparison : China - Japan (Tsukuba, Japan)  1980 Join in IPC-V (WRC/Davos, Switzerland) 1983 Pyrheliometer Intercomparison : Hong Kong - Japan (Tsukuba, Japan) 1985 Join in IPC-VI (WRC/Davos, Switzerland) 3

  4. Activities of RRC RA-II Tokyo No.2 - History and main activities - 1985 Join in IPC-VI (WRC/Davos, Switzerland) 1989 RPC-I : Regional Pyrheliometer Comparison of RA II & RA V (Tsukuba, Japan)  1990 Join in IPC-VII (WRC/Davos, Switzerland) 1994 Reference Pyranometer Calibration : Thailand (Tsukuba, Japan) 1995 Pyrheliometer Intercomparison : China - Japan (Tsukuba, Japan) Reference Pyranometer Calibration : Korea (Tsukuba, Japan) Join in IPC-VIII (WRC/Davos, Switzerland) 1996 Training for Calibration of Pyrheliometers : Korea (Tsukuba, Japan) 4

  5. Activities of RRC RA-II Tokyo No.3 - History and main activities - 1997 Pyrheliometer Intercomparison : Hong Kong & Korea - Japan (Tsukuba, Japan) Training for Reference Pyranometer Calibration : Philippines (Tsukuba, Japan) 2000 Join in IPC-IX (WRC/Davos, Switzerland) 2002 Pyrheliometer Intercomparison : Hong Kong, China & Korea - Japan (Tsukuba, Japan)  2005 Join in IPC-X (WRC/Davos, Switzerland) 2007 RPC-II : Regional Pyrheliometer Comparison of RA II(Tsukuba, Japan) 2010 Join in IPC-XI (WRC/Davos, Switzerland) 2012RPC-III (planned) 5

  6. Calibration system within the framework of WMO World Radiation Center Solar Radiometry Section （WRC-SRS） PMOD (Davos, Switzerland) World Standard Group (WSG) traceability International Pyrheliometer Comparison (IPC) Regional Radiaton Centre（RRC） RRC-Tokyo (Japan), RRC-Pune (India) Regional Standard Group Regional Pyrheliometer Comparison (RPC) National Radiation Centre（NRC） RIC-Beijing (China), RIC-Tsukuba (Japan) National Standard Group Calibration Operational instruments traceability traceability Conceptual diagram of calibration of solar radiation instruments within the framework of WMO 6

  7. Regional Pyrheliometer Comparison (RPC) • RPCs are held once every 5 years, in principle in the next year of IPC. • Last RPC was held from Jan. to Jan. 2007 at Tsukuba, Japan with 4 NRC in RAII and WRC. • The next RPC is planned in 2012. RPC at Mt.Tsukuba in 2007 7

  8. RPC at Mt. Tsukuba Mt. Tsukuba Aerological Observatory (BSRN Site: Tateno at Tsukuba City) 0 50km Mt. Tsukuba ▲877m TsukubaCity ●Narita ●Tokyo Keisei Hotel (560m) Mt. Tsukuba (877m)

  9. National Radiation Centre（NRC） • Intercomparisons are held once a year among the regional and national standard groups to maintain their accuracy. Annual internal pyrheliometer comparison at Mt.Tsukuba in 2010 Left: Regional standard group (pyrheliometers) Right: National standard group (pyranometers with collimation tubes) 9

  10. Pyranometer Calibration Result Sun and shade method (ISO9846) Collimation tube method Reference (Standard Instrument, Absolute Pyrheliometer) calibration calibration calibration Reference (Pyrheliometer CH1: PKT10359) (AHF: 32446) Pyranometer (CM21:970409 CMP21:070107) Pyranometer (CM21:970409 CMP21:070107) Pyrheliometer (CH1 : PKT10359) Coefficient (mV/W/m^2)

  11. Structure of the Collimation tube Target B A （Opening full-angle5°Slope angle1°） Diaphragm The scattered light is effectively suppressed by the diaphragms. Pyranometer The Pyranometer is set at the bottom of the tube, so it has the same structure as the Pyrheliometer. Comparison between the Sun and shade method （A） and the Collimation tube method （B） Mt.Tsukuba in 2009

  12. Calibration of infrared radiation instruments within the framework of WMO • The world infrared irradiance standard developed at PMOD based on the World Infrared Standard Group (WISG) in 2004. • RRCs are recommended to have a regional standard group of pyrgeometers and send them every three years to the WRC-IRS for calibration. World Radiation Centre Infrared Radiometry Section (WRC-IRS) PMOD (Davos, Switzerland) World Infrared Standard Group (WISG) traceability Calibration Service Regional Radiaton Centre（RRC） RRC-Tokyo (Japan), RRC-Pune (India) Regional Standard Group Current state of calibration of infrared radiation instruments within the framework of WMO 12

  13. The regional standard group at RRC-Tokyoc • List of pyrgeometers making up • the regional standard group (calibration date) • Eppley PIR/32205F3 (Dec, 2006) • Kipp&Zonen CG4/010567 (Jan, 2007) • Kipp&Zonen CGR4/070037 (Dec, 2008) • Kipp&Zonen CGR4/070038 (Dec, 2009) • Kipp&Zonen CGR4/070039 • (in calibration at PMOD, Now) • Each reference pyrgeometer is sent to WRC-IRS every 3 years for calibration. the regional standard group in a desiccator 13

  14. The pyrgeometer calibration procedure at RRC • Adopt the same procedure as the WRC-IRS’s • The pyrgeometers are calibrated outdoors by comparisng with the standard group.  traceable to the WISG inspected pyrgeometers the standard group Outdoor comparisons with the pyrgeometer standard group 14

  15. contribution for improvements of pyrgeometer calibration within the framework of WMO. pyrgeometer body temp.controller (bath vessel) data logger cavity temp. controller (bath vessel) Performance of JMA’s Black body (BB) cavity Comparisons of mean difference from reference longwave radiation by class of pyrgeometer body temperature (for K&Z CG4 s/n:050798). pyrgeometer signal dry air data logger black body cavity dry air temp. controller (pyrgeometer dome temp.) conical cavity desiccant heat transfer liquid Calibration coefficients for Eppley/PIR (s/n:32205F3) by WMO/World Radiation Center(WRC) and JMA P pump bath vessel bath vessel thermocontroller thermocontroller Pertier thermocontroller PC (cavity temp.) (body temp.) (dome temp.) Picture and schematic figure of JMA’s BB cavity

  16. Summary • RRC-Tokyo has been serving as RRC in RA II since 1965. • In January 2007, the RRC of Tokyo organized a regional intercomparison at Mt Tsukuba, attended by experts from China including Hong Kong, the Republic of Korea, Japan and the WRC. The report of the regional intercomparison has been published from WMO as WMO/TD-No. 1494. • Next RPC is planned in 2012 at Mt. Tsukuba. The details of the RRC will be announced to participants in due course. • RRC-Tokyo has established a pyrgeometer calibration procedure for Eppley PIR and Kipp&Zonen CG4/CGR4 pyrgeometers. • RRC-Tokyo would like to cooperate in calibration of radiation instruments for the improvements of surface radiation measurements. 16

  17. Thank you !! at Tateno 17

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