研究发现青藏高原等高海拔地区也存在臭氧减少的现象。HCl作为氯储存库，在O3的衰减过程中起了很重要的作用。因此精确探测与反演HCl是分析O3化学过程的首要条件。对于痕量气体，对地探测已不能满足要求，星载亚毫米波临边探测已成为获取HCl垂直分布主要手段。 . 目前，国际也已有的HCl反演算法是全球普适性的。然而，青藏高原由于海拔高，对流层薄，地表的热辐射对高层大气影响比较大，而且对流交换活动更加激烈，温湿廓线及大气成分随时间变化激烈。高海拔地区的这些特点将对HCl临边探测以及廓线反演都会带来不确定性。因此，项目以青藏高原为研究区，研究高海拔地区的辐射背景对高层大气成分探测的影响机制，并探讨其对反演的不确定性影响，建立青藏高原HCl亚毫米波临边探测反演算法。最后，开展HCl廓线反演试验，研究青藏高原2011-2016年HCl的变化趋势。

Many researches demonstrated that ozone reduction phenomenon also exists in high altitude area of Tibetan Plateau etc.. As the chlorine storage, HCl plays a very important role in the attenuation process of O3. Therefore, accurate detection and inversion of HCl is the primary key step of studying O3 chemical process. For the detection of trace gas, traditional nadir viewing cannot meet the requirements. The spaceborne submillimeter limb sounding has become the main means of obtaining HCl vertical distribution.. Presently, the existing HCl inversion algorithm is global universal. Because of the high elevation of the Tibetan Plateau, the troposphere is rather thin and convection exchange activities are more intense, and the profile of temperature and humidity and atmospheric composition also change quickly with time. These characteristics of high altitude area will bring uncertainty to the HCl limb sounding and its profile inversion. Therefore, taking the Tibetan plateau area as the study area, the project will study the mechanism of strong background radiation effects of high altitude areas on the upper atmosphere composition detection. Then, the uncertainty of this effect on the inversion algorithm of submillimeter limb sounding of HCl under the background of high altitude at the Tibetan plateau will be researched and the inversion algorithm will be establish. Finally, the inversion of HCl profiles will be performed. And, the change trend of HCl distribution of the Tibetan Plateau from 2011 to 2016 will be disscussed.