基于高光谱分辨率红外透射测量的气溶胶体积垂直廓线。I. 方法。

Vertical profiles of aerosol volume from high-spectral-resolution infrared transmission measurements. I. Methodology.

作者信息

Eldering A, Irion F W, Chang A Y, Gunson M R, Mills F P, Steele H M

出版信息

Appl Opt. 2001 Jun 20;40(18):3082-91. doi: 10.1364/ao.40.003082.

DOI:10.1364/ao.40.003082

Abstract

The wavelength-dependent aerosol extinction in the 800-1250-cm(-1) region has been derived from ATMOS (atmospheric trace molecule spectroscopy) high-spectral-resolution IR transmission measurements. Using models of aerosol and cloud extinction, we have performed weighted nonlinear least-squares fitting to determine the aerosol-volume columns and vertical profiles of stratospheric sulfate aerosol and cirrus cloud volume. Modeled extinction by use of cold-temperature aerosol optical constants for a 70-80% sulfuric-acid-water solution shows good agreement with the measurements, and the derived aerosol volumes for a 1992 occultation are consistent with data from other experiments after the eruption of Mt. Pinatubo. The retrieved sulfuric acid aerosol-volume profiles are insensitive to the aerosol-size distribution and somewhat sensitive to the set of optical constants used. Data from the nonspherical cirrus extinction model agree well with a 1994 mid-latitude measurement indicating the presence of cirrus clouds at the tropopause.

摘要

800 - 1250厘米⁻¹区域内与波长相关的气溶胶消光系数是通过大气痕量分子光谱仪（ATMOS）的高光谱分辨率红外传输测量得出的。利用气溶胶和云消光模型，我们进行了加权非线性最小二乘法拟合，以确定平流层硫酸盐气溶胶的气溶胶体积柱和垂直廓线以及卷云的体积。使用70 - 80%硫酸水溶液的低温气溶胶光学常数进行的消光模拟与测量结果显示出良好的一致性，并且1992年掩星探测得出的气溶胶体积与皮纳图博火山喷发后其他实验的数据一致。反演得到的硫酸气溶胶体积廓线对气溶胶粒径分布不敏感，而对所使用的光学常数集有些敏感。来自非球形卷云消光模型的数据与1994年中纬度测量结果吻合良好，表明对流层顶存在卷云。