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引用本文:

DOI:

10.11834/jrs.20210095

收稿日期:

2020-04-06

修改日期:

2020-07-19

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激光掩星探测大气UTLS温压和水汽的方法及仿真
李虎1,2, 王建宇1,2, 洪光烈1
1.中国科学院空间主动光电技术重点实验室,中国科学院上海技术物理研究所;2.中国科学院大学
摘要:

为探测对流层顶-平流层底(UTLS,Upper Troposphere/Lower Stratosphere,~5km-~35km)温度、压强和水汽,本文提出了激光掩星同时探测温度、压强和水汽的方法,包括方案设计和反演算法两部分。方案设计了近红外波段氧气双波长吸收和水汽单波长吸收激光进行掩星;反演算法方面重点研究了从氧气双波长吸收激光掩星数据反演温度,由温度计算压强的方法,然后在反演得到的温度、压强基础上,利用水汽单波长吸收激光掩星数据反演水汽密度的方法。建立掩星激光传输模型,选择合适的氧气吸收波长和水汽吸收波长模拟得到激光掩星透过率,在此基础上,对温度、压强和水汽反演算法进行了仿真,先反演得到了温度、压强廓线,然后将温度、压强廓线作为条件用于水汽分子数密度的反演。数值仿真和反演结果显示,温度数值反演误差小于0.8K,压强数值反演误差小于3.4%,水汽分子数密度数值反演误差小于3%,该结果说明了温度、压强反演方法和及基于温度、压强的水汽反演算法框架的可行性。

Inversion method and simulation of UTLS temperature and pressure and water vapor by laser occultation
Abstract:

In order to detect the temperature, pressure and water vapor at the top of the troposphere-bottom stratosphere (UTLS, Upper Troposphere / Lower Stratosphere, ~ 5km- ~ 35km), this paper proposes a method for simultaneous detection of temperature, pressure and water vapor by laser occultation, including scheme design and inversion Two parts of the algorithm. The scheme designs near-infrared band dual-wavelength oxygen absorption laser and water vapor single-wavelength absorption laser for occultation; the inversion algorithm focuses on the temperature inversion from the oxygen dual-wavelength absorption laser occultation data, and the method of calculating pressure from the temperature, and then inverting Based on the obtained temperature and pressure, the method of inverting the water vapor density using the single wavelength absorption laser occultation data of water vapor. Establish a occultation laser transmission model, select the appropriate oxygen absorption wavelength and water vapor absorption wavelength to simulate the laser occultation transmittance, on this basis, the temperature, pressure and water vapor inversion algorithm are simulated, and the temperature is first obtained by inversion , Pressure profile, and then use temperature and pressure profile as conditions for the inversion of water vapor molecular number density. The numerical simulation and inversion results show that the temperature numerical inversion error is less than 0.8K, the pressure numerical inversion error is less than 3.4%, and the water vapor molecular number density numerical inversion error is less than 3%. This result illustrates the temperature and pressure inversion methods and Feasibility of water vapor inversion algorithm framework based on temperature and pressure.Keywords: Laser occultation, inverse Abel integral transform, atmospheric temperature and pressure, double absorption wavelength, atmospheric water vapor

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