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- 저자 : Asim Daud (검색결과 1 건)
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A Study of Aerosol Properties over Lahore (Pakistan) by Using AERONET Data
Muhammad Ali,Salman Tariq,Khalid Mahmood,Asim Daud,Adila Batool,Zia-ul-Haq 한국기상학회 2014 Asia-Pacific Journal of Atmospheric Sciences Vol.50 No.2
It is well established that aerosols affect the climate in avariety of ways. In order to understand these effects, we require aninsight into the properties of aerosols. In this paper we present a studyof aerosol properties such as aerosol optical depth (AOD), singlescattering albedo (SSA) and aerosol radiative forcing (ARF) overmega city of Lahore (Pakistan). The data from Aerosol Robotic Network(AERONET) have been used for the period December 2009 toOctober 2011. The seasonal average values of AOD, asymmetryparameter (ASY) and volume size distribution in coarse mode wereobserved to be highest in summer. On the other hand, the averagevalues of Angstrom exponent (AE) and imaginary part of refractiveindex (RI) were found to be maximum in winter. The average valueof real part of RI was found to be higher in spring than in all otherseasons. The SSA exhibited an increasing trend with wavelength inthe range 440 nm - 1020 nm in spring, summer and fall indicating thedominance of coarse particles (usually dust). However, a decreasingtrend was found in winter in the range 675 nm - 1020 nm pointingtowards the dominance of biomass and urban/industrial aerosols. Asfar as aerosol radiative forcing (ARF) is concerned, we have foundthat during the spring season ARF was lowest at the surface of Earthand highest at top of the atmosphere (TOA). This indicates that theatmosphere was warmer in spring than in all the remaining seasons.
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