基于气象资料变化特征和辐射传输模式的微波辐射计工作状态分析

提出利用晴天每天早晨08时的观测资料,以大气温度季节变化统计特征为依据,来判断微波辐射计观测期间的工作状态。简要介绍了大气微波辐射传输方程,以南京冬春季节大气温度变化的统计特征为依据,以2010年11月27日—2011年5月29日期间南京某辐射计08时晴天的实验观测资料为例,通过对其12个通道的亮温观测值和计算值进行统计对比和物理分析,给出该辐射计实验观测期间的工作状态判断,认为用于湿度遥感的22.235、23.035、23.835、26.235和30.000GHz五个通道观测期间工作状态良好、稳定,而用于温度遥感的51.25、52.28、53.85、54.94、56.66、57.29和58.80 GHz七个通道性能一直衰退。本文提出的方法可供微波辐射计工作状态监测和观测资料质量控制参考。

Analysis on the working state of a ground-based microwave radiometer based on radiative transfer model and meteorological data variation features

The paper proposes to judge the working condition of a ground-based microwave radiometer for atmospheric remote sensing by observing the brightness temperature (TB) at 08:00 BST on clear days according to atmospheric temperature seasonal variation features.Radiative transfer theory was briefly introduced and the data of temperature at 08:00 BST observed at Nanjing during the period of November 27,2010 to May 29,2011 were used to make a statistical comparison between the observed TB with a ground-based microwave radiometer and the simulated TB with radiosonde profiles as input to radiative transfer calculation in order to judge the working condition of the radiometer.The radiometer has 12 channels including 5 channels at 22.235,23.035,23.835,26.235 and 30.000 GHz for sensing humidity and liquid water content and 7 channels at 51.25,52.28,53.85,54.94,56.66,57.29 and 58.80 GHz for sensing temperature profiles.The results showed that the former 5 channels worked well in the period while the latter 7 did not.The methodology may be applied to radiometers'' working condition monitoring as well as observation data quality control.