期刊
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
卷 108, 期 1, 页码 17-38出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jqsrt.2007.02.017
关键词
high-spectral-resolution infrared optical constants; multi-component aqueous tropospheric aerosol; ammonium sulfate; ammonium nitrate; sulfuric acid; nitric acid; infrared remote sensing
In this paper, the first part of two, we present new high-spectral-resolution infrared (IR) optical constants for multicomponent aqueous solutions composed of ammonium sulfate, ammonium nitrate, sulfuric acid and nitric acid over a range of compositions and temperatures representative of tropospheric conditions and atmospheric aerosols. The optical constants were determined from ATR measurements via a Kramers-Kronig transformation. To accomplish this, we adapted an existing technique for estimating the real index of refraction of aqueous sulfate and nitrate solutions at multiple visible frequencies as a function of concentration and temperature. An approximation of the low-frequency behavior of the ATR spectrum was also used to reduce the error associated with using ATR data of finite frequency range. This paper also provides a brief examination of absorption spectra for analyzed mixtures in relation to their composition and temperature and discusses possible implications. The new optical constants will be of great utility to high-spectralresolution IR remote sensing as well as radiative balance analysis in climate studies because they will enable researchers for the first time to model the impacts of tropospheric aqueous sulfate-nitrate-ammonium multi-component aerosols, including their mixtures with other important species such as dust or soot. (C) 2007 Elsevier Ltd. All rights reserved.
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