© Crown copyright Met Office John Nash 1, Tim Oakley 1, Mark Smees 1, S.Kurnosenko 2 and Li Wei 3 1 Met Office, Fitzroy Road, Exeter, EX1 3PB, UK 2

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© Crown copyright Met Office John Nash 1, Tim Oakley 1, Mark Smees 1, S.Kurnosenko 2 and Li Wei 3 1 Met Office, Fitzroy Road, Exeter, EX1 3PB, UK 2 3 Meteorological Observation Centre, China Meteorological Administration No. 46 Zhongguacun, Nandajie, BEIJING , China Initial Results from the WMO Radiosonde Intercomparison, Yangjiang, China, July 2010

Li Wei, Chinese Project Leader

WMO team, Project Leader Tim Oakley Remote sensing, Mark Smees, Data handling, Gonzague Romanens

WMO team, Project Leader Tim Oakley Remote sensing, Mark Smees

WMO team, Data manager, Sergey Kurnosenko

Holger Vomel, Scientific Sounding Systems Leader

Test took place from 13 July to 1 August at the Atmospheric Observatory, Yangjiang, Guangdong, China

62 Quality Radiosonde Test flights 10 Scientific Sounding test flights balloons and flight rig prepared by 15 Chinese radiosonde test experts selected from radiosonde stations across China

CompanyGround SystemRadiosondeTemperature sensor Humidity sensor Intermet iMet-3200iMet2Bead thermistorThin film Capacitor(E+E) Modem SR2K2M2K2DCBead thermistorCapacitive polymer Graw Radiosonde GmbH GS-EDFM-09ThermistorThin film Capacitor(E+E) Meteolabor ARGUS 37SRS-C34ThermocoupleHygroclip Rotronic *Snow White hygrometer Nanjing Da Qiao Machine Co Ltd L-Band GFE1 type GTS1-2 digital Cylindrical thermistor HS02 Humicap Jin Yang GL-5000PBRSG-20ANTC ThermistorThin film Capacitor(E+E) Mesei Co. LTD RD-06GRS-06GThermistorCapacitance polymer Vaisala Oyj DigiCora, MW31RS92-SGPCapacitive wireThin film capacitor, heated twin sensor Beijing Chang Feng Surface Acoustic wave Co. GPS Radiosounding System CF-06-ABead resistance Thin film Capacitor China HuaYun HY-GTS(U)GTS(U)1-1Bead thermistorThin film Capacitor(E+E) Lockheed Martin Sippican INC LMG6GPSLMS6 Radiosonde GPS Multithermistor LMS6 Radiosonde Chip thermistorThin film Capacitor(E+E)

Changfeng Huayun Daqiao Vaisala LMS

Graw Intermet Meisei Meteolabor Jinyang

Highest measurement

Balloon rate of ascent, m.s -1

Merged preliminary results for quality radiosondes Not to be reproduced

Radiosondes allowed on Scientific sounding instrument (SSI) flights were: Cryogenic Frost point hygrometer (CFH) Meisei fast response temperature sensor LMS Multithermistor LMS6 Radiosonde Vaisala reference radiosonde ( DryCap frost point measurement) Graw DFM-09 radiosonde [limited number of flights]

Science flight night

Science flight night

Science flight day

Science flight day