紫外臭氧垂直探测仪(SBUS)辐射定标和反演臭氧垂直廓线验证

Radiometric Calibration of the Solar Backscatter Ultraviolet Sounder and Validation of Ozone Profile Retrievals

风云三号卫星（FY-3）是中国第二代极轨气象卫星，紫外臭氧垂直探测仪（SBUS）是该卫星11个主要星载遥感仪器之一。阐述了卫星发射前和发射后紫外臭氧垂直探测仪定标、数据及产品验证的结果。主要内容包括仪器发射前的定标和特性描述、在轨监测、臭氧垂直廓线反演产品检验，以及其产品在2011年北极严重臭氧损耗中的监测应用。紫外臭氧垂直探测仪发射前定标，实验室定标不确定性估计大约为4.7%，在轨监测表明漫反射板反射率252nm通道大约衰减15%，其他11个通道大约衰减3%～5%。与美国NOAA卫星同类载荷SBUV/2s反演产品进行比较，FY-3A SBUS反演产品相对差异百分率大约为±7%，而FY-3B SBUS产品相对偏差百分率大约为±6%。利用FY-3 SBUS臭氧垂直廓线监测2011年春季北极严重臭氧损耗，表明从对流层上层到平流层下部的臭氧损耗占臭氧总量损耗的70%～80%。

The Solar Backscatter Ultraviolet Sounder(SBUS) is one of the 11 main payload instruments onboard Feng Yun-3(FY-3),the second generation of Chinese polar orbit meteorological satellites.This paper presents the results of SBUS instrument calibration,and data and product validation during the prelaunch and postlaunch periods.Topics include the instrument of the ozone profiles retrieved from the FY-3 SBUS measurements,and an application of the retrievals to monitoring the 2011 Arctic ozone depletion.For the prelaunch calibration of SBUS,the estimated uncertainty of laboratory calibration is approximately 4.7%.The in-orbit solar irradiance measurements indicate that the diffuser reflectivity degraded approximately 15% for the 252-nm channel,and 3% to 5% for the other 11 channels during a 12-mo period.Using ozone vertical profiles retrieved from National Oceanic and Atmospheric Administration Solar Backscatter Ultraviolet(SBUV)/2s as a 'truth,' the initial comparison of ozone profiles between FY-3 SBUS and SBUV/2s finds that the relative percent bias of the FY-3 SBUS with the SBUV/2 results is good.The averaged differences range over to ±7% for FY-3A SBUS and ±6% for FY-3B SBUS.The SBUS ozone profile retrievals reveal that the spring 2011 Arctic ozone depletion mainly resulted from a sharp ozone decrease in the upper troposphere to lower stratosphere,which accounts for 70% to 80% of the total ozone loss.