Dust characteristics and radiative properties: Implication to climatic impacts
محل انتشار: اولین کنفرانس بین المللی گرد و غبار
سال انتشار: 1394
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 556
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شناسه ملی سند علمی:
TICD01_001
تاریخ نمایه سازی: 25 آذر 1395
چکیده مقاله:
Dust optical and radiative properties were analyzed in the urban environment of Karachi using Aerosol Robotik Network (AERONET) data. During the dusty days significant variations were found in Aerosol Optical Depth (AOD), aerosol Volume Size Distribution (VSD), Single Scattering Albedo (SSA), Asymmetry Parameter (ASY), Refractive Index (RI), and Aerosol Radiative Forcing (ARF). The AOD values were in the range from 0.95 to 2.07 during dusty days. The VSD in coarse mode aerosols was high during dusty days and no significant variations was found in VSD fine mode. The SSA values in dusty days were in the range from 0.91 to 0.99, which showed the existence of dust over the urban environment. The ASY and RI values indicated the predominance of mineral dust particles. The shortwave (SW) andlongwave (LW) aerosol radiative forcing (ARF) were in the range from -0.01 to +97−2, +29.2 to +14.6−2 at the top of atmosphere, and -220 to +27.1−2, +20.7 to +11.6−2 at the earth's surface, respectively. The LW radiation, therefore produced significant warming both at the earth's surface and top of the atmosphere. The Hybrid Single Lagrangian Integrated Trajectory (HYSPLIT) model was used to investigate the origin of air masses in order to find the paths and source regions for the dust transported to Karachi. The results revealed that air masses arrived in Karachi were from Iran, Afghanistan, Russia, and the Middle East.
کلیدواژه ها:
نویسندگان
Khan Alam
Department of Physics, University of Peshawar, Peshawar 25120, KPK, Pakistan
Samina Bibi
Department of Physics, University of Peshawar, Peshawar 25120, KPK, Pakistan
Rehana Khan
Department of Physics, University of Peshawar, Peshawar 25120, KPK, Pakistan
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