Aerosol optical and physical properties during winter monsoon pollution transport in an urban environment

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Title:	Aerosol optical and physical properties during winter monsoon pollution transport in an urban environment
Authors:	彭祥;Verma, S;Bhanja, S. N;Pani, S. K;Misra, A
Contributors:	地球科學學院大氣科學學系
Keywords:	Aerosols;Aerosols - analysis;air;Air masses;Air Pollutants;Air Pollutants - analysis;Air Pollution;Air Pollution - analysis;Air Pollution - statistics & numerical data;Air temperature;analysis;Anthropogenic factors;Aquatic Pollution;Argon oxygen decarburizing;Atmosphere;Atmosphere - chemistry;Atmospheric Protection/Air Quality Control/Air Pollution;Biofuels;Channels;chemistry;Cities;Cities - statistics & numerical data;Climate change;Combustion;Earth and Environmental Science;Ecotoxicology;Emissions;Environment;Environmental Chemistry;Environmental Health;Environmental Monitoring;Environmental science;Fossil fuels;image analysis;Low temperature;mixing;moderate resolution imaging spectroradiometer;MODIS;monsoon season;Monsoons;Open burning;Optical analysis;Physical properties;Plant protection;pollutants;Pollution;Pollution dispersion;Pollution transport;Radiation;Regions;Remote sensing;Research Article;Satellites;Seasons;statistics & numerical data;Studies;Sustainable development;temperature;Urban areas;Urban environments;Waste Water Technology;Water Management;Water Pollution Control;Wavelength;Wind;Wind speed;Winter
Date:	2014-01-01
Issue Date:	2026-04-21 13:48:27 (UTC+8)
Publisher:	Springer Science + Business Media;Berlin/Heidelberg: Springer-Verlag
Abstract:	摘要： We analysed aerosol optical and physical properties in an urban environment (Kolkata) during winter monsoon pollution transport from nearby and far-off regions. Prevailing meteorological conditions, viz. low temperature and wind speed, and a strong downdraft of air mass, indicated weak dispersion and inhibition of vertical mixing of aerosols. Spectral features of WinMon aerosol optical depth (AOD) showed larger variability (0.68–1.13) in monthly mean AOD at short-wavelength (SW) channels (0.34–0.5 μm) compared to that (0.28–0.37) at long-wavelength (LW) channels (0.87–1.02 μm), thereby indicating sensitivity of WinMon AOD to fine aerosol constituents and the predominant contribution from fine aerosol constituents to WinMon AOD. WinMon AOD at 0.5 μm (AOD ₀. ₅) and Angstrom parameter ( α) were 0.68–0.82 and 1.14–1.32, respectively, with their highest value in December. Consistent with inference from spectral features of AOD, surface aerosol loading was primarily constituted of fine aerosols (size 0.23–3 μm) which was 60–70 % of aerosol 10- μm (size 0.23–10 μm) concentration. Three distinct modes of aerosol distribution were obtained, with the highest WinMon concentration at a mass median diameter (MMD) of 0.3 μm during December, thereby indicating characteristics of primary contribution related to anthropogenic pollutants that were inferred to be mostly due to contribution from air mass originating in nearby region having predominant emissions from biofuel and fossil fuel combustion. A relatively higher contribution from aerosols in the upper atmospheric layers than at the surface to WinMon AOD was inferred during February compared to other months and was attributed to predominant contribution from open burning emissions arising from nearby and far-off regions. A comparison of ground-based measurements with Moderate Resolution Imaging Spectroradiometer (MODIS) data showed an underestimation of MODIS AOD and α values for most of the days. Discrepancy in relative distribution of fine and coarse mode of MODIS AOD was also inferred. 其他題名： Environ Sci Pollut Res 其他題名： Environ Sci Pollut Res Int 出版者： Berlin/Heidelberg: Springer-Verlag 出版日期： 2014-04-01 出處： Environmental Science and Pollution Research, 2014-04, Vol.21 (7), p.4977-4994 資源來源： ABI/INFORM Collection 版權： Springer-Verlag Berlin Heidelberg 2013 版權： Springer-Verlag Berlin Heidelberg 2014 識別號： ISSN: 0944-1344 識別號： ISSN: 1614-7499 識別號： EISSN: 1614-7499 識別號： DOI: 10.1007/s11356-013-2383-5 識別號： PMID: 24363049
Appears in Collections:	[Department of Atmospheric Sciences] journal & Dissertation

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