Simulating sensitivity of O<sub>3</sub> and HCl with THz limb sounding

Hongmei WANG; Xiaoying LI; Liangfu CHEN; Yapeng WANG; Ying ZHANG; Mingmin ZOU; Chao YU; Songyan ZHU

doi:10.11834/jrs.20176393

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Simulating sensitivity of O₃ and HCl with THz limb sounding
Vol. 21, Issue 5, Pages: 653-664(2017)
Received：03 November 2016，

Accepted：10 March 2017，

Published：2017-09
DOI： 10.11834/jrs.20176393
稿件说明：

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王红梅, 李小英, 陈良富, 王雅鹏, 张莹, 邹铭敏, 余超, 朱松岩. 2017. 太赫兹临边探测O₃与HCl敏感性分析. 遥感学报, 21(5): 653–664 DOI： 10.11834/jrs.20176393.

Wang H M, Li X Y, Chen L F, Wang Y P, Zhang Y, Zou M M, Yu C and Zhu S Y. 2017. Simulating sensitivity of O₃ and HCl with THz limb sounding. Journal of Remote Sensing, 21(5): 653–664 DOI： 10.11834/jrs.20176393.

摘要

臭氧(O

)是平流层大气最重要的成分之一，而随着人类活动增加的影响，平流层O

不断减少。在O

的衰减循环中，Cl化合物是最主要的介质，而氯化氢(HCl)是活性氯的储存库，因此同时探测O

与HCl对进一步认清平流层O

的源与汇具有重要意义。本文基于太赫兹临边探测辐射传输软件包ARTS(Atmospheric Radiative Transfer Simulator)，模拟研究太赫兹临边探测O

与HCl的敏感因子量化大气辐射传输及其他大气成分对O

和HCl的影响。结果表明：(1)在太赫兹波段，O

与HCl分别在切高大于8 km与大于10 km处，具有很高的敏感性，可以探测O

与HCl垂直廓线；(2)太赫兹临边探测对于探测目标O

和HCl，在10 km及以下高度，对目标的浓度变化不敏感，而在中高空则很敏感；温度与水汽的变化对O

与HCl的探测影响不大，而传感器的天线半带宽及光谱分辨率对于O

与HCl的探测有一定的影响。

Abstract

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 O

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 O

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 O

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 O

and HCl sensitive factors are further studied by limb sounding. The results are as follows: (1) Measuring O

above the tangent height of 8 km at frequency of 235.7098 GHz is highly possible

whereas to measure O

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 O

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 O

and HCl.

关键词

Keywords

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Sub-millimeter wave limb sounding simulation of the plume flow of a high-flying vehicle

Overview of sub-millimeter limb sounding

Simulating sensitivity of O3 and HCl with THz limb sounding

DOI： 10.11834/jrs.20176393

摘要

Abstract

关键词

Keywords

references

Simulating sensitivity of O₃ and HCl with THz limb sounding