In situ aerosol characterization at Cape Verde Part 2: Parametrization of relative humidity- and wavelength-dependent aerosol optical properties

IF 2.3 4区地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES

Tellus Series B-Chemical and Physical Meteorology Pub Date : 2011-09-01 DOI:10.3402/TELLUSB.V63I4.16347

A. Schladitz, T. Müller, S. Nordmann, M. Tesche, S. Groß, V. Freudenthaler, J. Gasteiger, A. Wiedensohler

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引用次数: 8

Abstract

An observation-based numerical study of humidity-dependent aerosol optical properties of mixed marine and Saharan mineral dust aerosol is presented. An aerosol model was developed based on measured optical and microphysical properties to describe the marine and Saharan dust aerosol at Cape Verde. A wavelength-dependent optical equivalent imaginary part of the refractive index and a scattering non-sphericity factor for Saharan dust were derived. Simulations of humidity effects on optical properties by the aerosol model were validated with relative measurements of the extinction coefficient at ambient conditions. Parametrizations were derived to describe the humidity dependence of the extinction, scattering, and absorption coefficients as well as the asymmetry parameter and single scattering albedo. For wavelengths (300–950 nm) and dry dust volume fractions (0–1), aerosol optical properties as a function of relative humidity (RH = 0–90%) can be calculated from tabulated parameters. For instance, at a wavelength of 550 nm, a volume fraction of 0.5 of dust on the total particle volume (dry conditions) and a RH of 90%, the enhancements for the scattering, extinction and absorption coefficients are 2.55, 2.46 and 1.04, respectively, while the enhancements for the asymmetry parameter and single scattering albedo are 1.11 and 1.04. DOI: 10.1111/j.1600-0889.2011.00568.x

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佛得角的原位气溶胶表征。第2部分:相对湿度和波长相关气溶胶光学特性的参数化

提出了一种基于观测的海洋和撒哈拉混合矿物粉尘气溶胶随湿度变化光学特性的数值研究方法。基于测量的光学和微物理特性，开发了一个气溶胶模型来描述佛得角的海洋和撒哈拉沙尘气溶胶。推导了撒哈拉沙尘折射率的波长相关光学等效虚部和散射非球性因子。通过环境条件下消光系数的相关测量，验证了气溶胶模型对湿度对光学特性影响的模拟。推导了消光系数、散射系数和吸收系数以及不对称参数和单次散射反照率与湿度的关系的参数化。对于波长(300-950 nm)和干尘体积分数(0-1)，气溶胶光学特性作为相对湿度(RH = 0-90%)的函数可以从表列参数中计算出来。例如，在波长为550 nm、粉尘占总颗粒体积分数为0.5(干燥条件下)、相对湿度为90%时，散射系数、消光系数和吸收系数的增强分别为2.55、2.46和1.04，非对称系数和单次散射反照率的增强分别为1.11和1.04。DOI: 10.1111 / j.1600-0889.2011.00568.x

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Tellus Series B-Chemical and Physical Meteorology 地学-气象与大气科学

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期刊介绍： Tellus B: Chemical and Physical Meteorology along with its sister journal Tellus A: Dynamic Meteorology and Oceanography, are the international, peer-reviewed journals of the International Meteorological Institute in Stockholm, an independent non-for-profit body integrated into the Department of Meteorology at the Faculty of Sciences of Stockholm University, Sweden. Aiming to promote the exchange of knowledge about meteorology from across a range of scientific sub-disciplines, the two journals serve an international community of researchers, policy makers, managers, media and the general public.