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Simulating sensitivity of O3 and HCl with THz limb sounding

  • role： First author第一作者
  • Affiliation：

    National Key Laboratory of Remote Sensing and Digital Earth Institute, Chinese Academy of Sciences, Beijing 100101, China

    Chinese Academy of Sciences, Beijing 100049, China

  • Email：wwhongmei@126.com
  • Introduction：王红梅(1986—　)，女，博士研究生，研究方向为大气环境遥感。E-mail：wwhongmei@126.com
WANG Hongmei12,  
  • role： Corresponding author通信作者
  • Affiliation：

    National Key Laboratory of Remote Sensing and Digital Earth Institute, Chinese Academy of Sciences, Beijing 100101, China

  • Email：Lixyol@radi.ac.cn
  • Introduction：李小英(1975—　)，女，副研究员，研究方向为太赫兹波段临边探测原理与大气成分反算算法。E-mail：Lixyol@radi.ac.cn
LI Xiaoying1*,  
  • Affiliation：

    National Key Laboratory of Remote Sensing and Digital Earth Institute, Chinese Academy of Sciences, Beijing 100101, China

CHEN Liangfu1,  
  • Affiliation：

    National Key Laboratory of Remote Sensing and Digital Earth Institute, Chinese Academy of Sciences, Beijing 100101, China

    Chinese Academy of Sciences, Beijing 100049, China

WANG Yapeng12,  
  • Affiliation：

    National Key Laboratory of Remote Sensing and Digital Earth Institute, Chinese Academy of Sciences, Beijing 100101, China

ZHANG Ying1,  
  • Affiliation：

    National Key Laboratory of Remote Sensing and Digital Earth Institute, Chinese Academy of Sciences, Beijing 100101, China

ZOU Mingmin1,  
  • Affiliation：

    National Key Laboratory of Remote Sensing and Digital Earth Institute, Chinese Academy of Sciences, Beijing 100101, China

YU Chao1,  
  • Affiliation：

    National Key Laboratory of Remote Sensing and Digital Earth Institute, Chinese Academy of Sciences, Beijing 100101, China

    Chinese Academy of Sciences, Beijing 100049, China

ZHU Songyan12

résumé

O3 is the key composition of stratosphere. The problem on ozone and the effect on ozone by anthropogenic actions have always been the hot issue in the world. During attenuation circle of ozone, Chlorine composition is the most important medium. HCl is the storage of active chlorine. Therefore, monitoring HCl is significant. The development of limb sounding can supply three-dimensional information of O3 and HCl. Simulation interface of THz limb sounding is developed based on the THz limb sounding radiative transfer software ARTS. This study analyzes the low-limit height within the limb sounding in THz bands between 100 GHz and 1000 GHz. The frequencies, 235.7098 GHz and 625.9188 GHz, were selected as the central frequencies for O3 and HCl, respectively, based on the frequency of international available THz sensor radiometer. Then, the brightness temperature of limb sounding was simulated under different atmospheric backgrounds (standard atmospheric background and enhanced concentration of O3 and HCl at 5%, 10%, and 15%, respectively), different temperatures and moistures (standard background temperature at 0.5 K, 1 K, and 1.5 K increase, standard water vapor concentration increased by 5%, 10%, and 15%), and different bands and different sensor characteristics (different HPBW and different spectral resolution). The sensitivity analysis module of the simulation interface shows that O3 and HCl sensitive factors are further studied by limb sounding. The results are as follows: (1) Measuring O3above the tangent height of 8 km at frequency of 235.7098 GHz is highly possible, whereas to measure O3 below 8 km is difficult. For the measurement of HCl, the threshold height is 10 km, above which profiles of HCl can be available and below which profiles is difficult to measure. (2) At THz bands, the variety of temperature and moisture has little effect on the measurements of O3 and HCl. Therefore, THz bands are superior to infrared bands, which are influenced greatly by temperature. (3) Half power beam width and spectral resolution have a certain effect on the measurements of O3 and HCl.

mots-clés

THz;ARTS(Atmospheric Radiative Transfer Simulator);HCl;O3;limb sounding

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