Osamu Ijima. Radiation Section, Atmospheric Environment Division, Global Environment and Marine Department, Japan Meteorological Agency (JMA)

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1 Osamu Ijima Radiation Section, Atmospheric Environment Division, Global Environment and Marine Department, Japan Meteorological Agency (JMA) Oct. 2010, IPC-XI, Davos, Switzerland 1

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

3 Activities of RRC RA-II Tokyo No.1 - History and main activities Pyrheliometer Intercomparison : India - Japan (Pune, India) 1965 Regional 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 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 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) 2012 RPC-III (planned) 5

6 Calibration system within the framework of WMO World Radiation Center Solar Radiometry Section WRC-SRS World Standard Group (WSG) PMOD (Davos, Switzerland) 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 Operational instruments 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 at Tsukuba, Japan with 4 NRC in RAII and WRC. The next RPC is planned in RPC at Mt.Tsukuba in

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

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 Collimation tube method Sun and shade method (ISO9846) Reference (Standard Instrument, Absolute Pyrheliometer) calibration calibration (AHF: 32446) calibration Pyranometer (CM21: CMP21:070107) Method Date Reference Collimation tube method Sun and shade method (ISO9846) Pyrheliometer (CH1 : PKT10359) 2009/1/25 ~ 2009/1/28 Absolute Pyrheliometer AHF Reference (Pyrheliometer CH1: PKT10359) Light source Coefficient (mv/w/m^2) Pyranometer CM Pyranometer CMP Outdoor /2/6 Pyrheliometer Outdoor /2/12 CH1 PKT10359 Outdoor Pyranometer (CM21: CMP21:070107)

11 Structure of the Collimation tube Target (Opening full-angle 5 Slope angle 1 ) Pyranometer Diaphragm The scattered light is effectively suppressed by the diaphragms. A B The Pyranometer is set at the bottom of the tube, so it has the same structure as the Pyrheliometer. Mt.Tsukuba in 2009 Comparison between the Sun and shade method (A) and the Collimation tube method (B)

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 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) 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/ (Jan, 2007) Kipp&Zonen CGR4/ (Dec, 2008) Kipp&Zonen CGR4/ (Dec, 2009) Kipp&Zonen CGR4/ (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. 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). Temp. class (deg.c) difference without BB calibration (W/m 2 ) difference with BB calibration (W/m 2 ) Calibration coefficients for Eppley/PIR (s/n:32205f3) by WMO/World Radiation Center(WRC) and JMA Coefficient WRC (Dec. 2006) JMA (Jun. 2004) JMA (Jan. 2007) C k k k data logger PC pyrgeometer body temp. controller (bath vessel) black body cavity signal bath vessel pyrgeometer conical cavity heat transfer liquid data logger cavity temp. controller (bath vessel) dry air temp. controller (pyrgeometer dome temp.) bath vessel dry air desiccant Picture and schematic figure of JMA s BB cavity P pump thermocontroller thermocontroller Pertier thermocontroller (cavity temp.) (body temp.) (dome temp.) 15

16 Summary RRC-Tokyo has been serving as RRC in RA II since 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 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 at Tateno 17

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