کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4438665 1620409 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of aerosol composition on visibility in megacity Delhi
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
پیش نمایش صفحه اول مقاله
Influence of aerosol composition on visibility in megacity Delhi
چکیده انگلیسی

Influence of aerosol composition on visibility degradation in megacity Delhi has been quantified using model-derived seasonal mean aerosol composition constrained by satellite-measured columnar aerosol optical depth spectrum. Aerosols contribute ∼90% to the observed visibility degradation in non-foggy condition, while its relative contribution decreases rapidly at RH ≥ 80% due to stronger relative influence of fog droplets on attenuation of radiation, especially during the winter season. Visibility is most sensitive to water-soluble particles and soot in all seasons. Sensitivity study shows that visibility does not respond strongly to reduction of mass concentration of insoluble, accumulation mode and coarse mode dust particles. Reduction of mass concentration of soot and water-soluble particles in the range of 10%–50% will lead to an increase in visibility by 2.4 ± 0.1%–11.3 ± 1.6% and 4.9 ± 2%–29 ± 12% respectively. Reduction of the last two anthropogenic components has co-benefits, as it may reduce fog formation and thus further enhance the visibility along with an improved air quality in terms of associated health and climatic effects.


► Role of aerosols on visibility degradation in megacity Delhi is examined.
► Sensitivity of visibility to individual aerosol species is examined.
►  Seasonally representative aerosol composition is derived.
► The quantitative estimates can help addressing the visibility problem in this region.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Environment - Volume 62, December 2012, Pages 367–373
نویسندگان
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