کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8863424 1620283 2018 25 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A parameterization for the light scattering enhancement factor with aerosol chemical compositions
ترجمه فارسی عنوان
پارامترها برای عامل افزایش پراکندگی نور با ترکیبات شیمیایی آئروسل
کلمات کلیدی
عامل افزایش پراکندگی نور، تنظیم پارامتر، هیبرید آئروسل، ترکیبات شیمیایی،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
چکیده انگلیسی
The light scattering enhancement factor f (RH), defined as the ratio of the light scattering coefficient (σSP) observed under an elevated relative humidity (RH) conditions to that under dry conditions, is a crucial parameter for estimating aerosol direct radiative effects and atmospheric visibility. In this paper, a new f (RH) parameterization scheme considering both the influence of aerosol chemical compositions and that of particle number size distribution (PNSD) is proposed based on in situ measurements in the North China Plain. The development of this parameterization scheme includes three steps. First, aerosol hygroscopicity parameter κ is parameterized with aerosol chemical compositions. Then, the ratio between f (RH) fitted parameter κsca (f(RH)=1+κscaRH100−RH) and κ is introduced to correlate f (RH) with κ. The ratio, influenced mostly by PNSD, is described as a function of scattering Ångström exponent (SAE) because the SAE can represent the predominant size of aerosol particles to some extent. Finally, f (RH) cycle is parameterized with κsca. Validation results show that a good consistency between the parameterized and measured f (RH = 80%) is achieved and the correlation coefficient is 0.80. This parameterization scheme between aerosol chemistry and f (RH) can be used in chemical transport models for reducing uncertainties in estimations of direct aerosol radiative forcing and air quality assessments.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Environment - Volume 191, October 2018, Pages 370-377
نویسندگان
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