92nd American Meteorological Society Annual Meeting (January 22-26, 2012)

Wednesday, 25 January 2012: 11:45 AM
The Earth Radiation Budget Measurement From Chinese Fengyun-3 Series Satellites
Room 342 (New Orleans Convention Center )
Hong Qiu, National Satellite Meteorological Center/China Meteorological Administration, Beijing, China; and Y. Zhang, C. Dong, and L. Hu

The new generation polar orbit series satellites FY-3A/B were launchd in 2008 and 2010. To obtain the information of the earth radiation budget from space is the one of the important missions of Chinese Fengyun-3 series satellites in the furture decade. The two instruments onbroad FY-3A and FY-3B ,the Earth Radiarion Measurement(ERM) and the Solar Irradiance Monior(SIM) were designed to measure the solar irradiance ,the reflected solar radiance and the emitted radiance at the top of the atmosphere. The ERM includes two broadband channels: the shortwave(SW)(0.2-4.3µm) and the total wave(TW) channel(0.2-50µm) with scan and nonscan view of the earth. The SIM observes the total irradiance with three same broadband channels(0.2-50µm) at different angles while the satellite pass the polar areas. The radiative response of ERM's SW channel on FY-3A suddenly degraded to zero from March to June,2010. After the launches of FY-3B, the calibration of ERM was demonstrated with comparing the observed radiance between ERM and CERES onboard Aqua with SNO method. Considering the difference of spectral response between the ERM and CERES, the bias of the observed radiance is about2.67w/m2str for long wave channel and -2.49 w/m2str for shortwave channel. The stability of ERM observation was evaluated by analysing the change of the observations of internal calibration source (ICS) by the shortwave and total channels from ground calibration. It was shown that the launch caused the change in the radiative response is about 1.7% for SW channel and 0.15% for TW channel; it was about 1.9% and 0.4% after 3 and half month. The observation from SIM was calibrated with World Radiation Center ‘s radiavtive reference and processed with the correction of the space effect. The derived solar constant from SIM on FY-3B has a similar trend with that from Total Irradiance Monitor(TIM) on SORCE. The observed radiance from ERM was unfiltered to the reflected solar radiance and the emitted longer wave earth radiance, transferred to flux with Angle Distributed Model(ADM) from ERBE. The monthly products from ERM and SIM on FY-3A and FY-3B were used to analyze the characteristics of the reflected solar and emitted earth flux at TOA during the 2010-2011 El Niño and La Niña course.

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