کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8895242 1629898 2018 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Aerosol removal due to precipitation and wind forcings in Milan urban area
ترجمه فارسی عنوان
حذف آئروسل به علت بارش و وزش باد در منطقه شهری
کلمات کلیدی
تخلیه ته نشینی، پراکندگی باد، اسپری شهری، حذف ذرات،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی
Air pollution represents a critical issue in Milan urban area (Northern Italy). Here, the levels of fine particles increase, overcoming the legal limits, mostly in wintertime, due to favourable calm weather conditions and large heating and vehicular traffic emissions. The main goal of this work is to quantify the aerosol removal effect due to precipitation at the ground. At first, the scavenging coefficients have been calculated for aerosol particles with diameter between 0.25 and 3 μm. The average values of this coefficient vary between 2×10-5 and 5×10-5 s−1. Then, the aerosol removal induced separately by precipitation and wind have been compared through the introduction of a removal index. As a matter of fact, while precipitation leads to a proper wet scavenging of the particles from the atmosphere, high wind speeds cause enhanced particle dispersion and dilution, that locally bring to a tangible decrease of aerosol particles' number. The removal triggered by these two forcings showed comparable average values, but different trends. The removal efficiency of precipitation lightly increases with the increase of particle diameters and vice versa happens with strong winds.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hydrology - Volume 556, January 2018, Pages 1256-1262
نویسندگان
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