太赫兹大气临边探测仪遥感中高层大气风仿真  

Simulation of the Middle and Upper Atmospheric Wind Measurement of THz Atmospheric Limb Sounder

作　　者：王文煜 王振占 段永强 WANG Wenyu;WANG Zhenzhan;DUAN Yongqiang(Key Laboratory of Microwave Remote Sensing,National Space Science Center,Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国科学院国家空间科学中心微波遥感技术重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《空间科学学报》2021年第4期589-596,共8页Chinese Journal of Space Science

基　　金：国家自然科学基金项目资助(41771405)。

摘　　要：太赫兹大气临边探测仪(TALIS)是中国正在预研的第一台THz频段的临边探测仪,主要用于高精度、高分辨率的大气遥感测量.TALIS的观测目标主要包括大气温度、大气压强、大气成分(例如H_(2)O,O_(3),HCl,ClO,N_(2)O,HNO_(3)等)的垂直分布以及长期变化趋势.由于TALIS的频段覆盖了许多重要的吸收谱线,其观测数据中包含大气风的多普勒信息,因此可以用于反演中高层风的廓线.本文针对TALIS视线多普勒风的观测进行仿真,利用辐射传输模型(ARTS)评估了TALIS测风的潜力和相应的反演精度.结果表明,TALIS的118 GHz谱仪具有较好的测量精度,在70 km处的精度为12 m·s^(-1).183 GHz,633 GHz和658 GHz谱仪也有一定的测量信息,反演精度分别为19 m·s^(-1)(60km),19 m·s^(-1)(50 km),16 m·s^(-1)(50km).TALIS有一个候选的测风谱仪位于655 GHz频段,其在55 km处的反演精度为11m·s^(-1).此外,虽然降低谱分辨率能有效提高系统灵敏度,但并不能提高反演精度,需要通过降低系统噪声来提高测风的精度.Middle and upper atmospheric wind is a key parameter in atmospheric science.Groundbased radar,lidar,and interferometer are usually used to measure the atmospheric wind.Up to now,the payload which can measure the atmospheric wind from space is quite scarce.Microwave limb sounding can also measure wind in the middle and upper atmosphere.THz Atmospheric Limb Sounder(TALIS)is the first Chinese microwave limb sounder being developed for atmospheric vertical profile observation.The main targets of TALIS are atmospheric vertical profiles of temperature,pressure and chemical species such as H_(2)O,O3,HCl,ClO,N_(2)O,HNO_(3).Since TALIS covers many strong lines,the observation data will contain doppler information of atmospheric wind,so it can be used to retrieve the atmospheric wind.In this paper,a simulation is performed to evaluate the precision of wind retrieval by using the Atmospheric Radiative Transfer Simulator(ARTS).The results suggest that 118 GHz retrieval has a better precision of 12 m·s^(-1)at 70 km.The precision of 183 GHz,633 GHz and 658 GHz are 19 m·s^(-1)(60 km),19 m·s^(-1)(50 km),16 m·s^(-1)(50 km),respectively.655 GHz is a candidate band that has a large potential for wind measurement in the stratosphere and its precision is 11 m·s^(-1)at 55 km.The simulation also shows that reducing the spectral resolution to improve the NEDT has almost no contribution to a better retrieval precision.Reducing the system noise temperature is the only way to improve the precision.

关 键 词：临边探测 TALIS 大气辐射传输 大气风反演 

分 类 号：P414[天文地球—大气科学及气象学]