Atmospheric dry deposition of black carbon: direct measurement and model development
Abstract
Black carbon has detrimental effects on glacier, soils, vegetation and materials and poses threat to human health also. Vegetation act as sink and get affected due to dry deposition of black carbon. In the present investigation, atmospheric concentration of black carbon is measured and dry deposition to surrogate surface has been determined directly at Agra, a site over Indo-Gangetic basin. The mean mass concentration of black carbon is 7.2 μg m-3 and varies from 0.22 μg m-3 to 63.1 μg m-3. It is quite higher than other sites like Kanpur, Nainital, Dibrugarh, Ranchi, Kolkata etc. of the Indo-Gangetic basin. The dry deposition flux of black carbon on surrogate surface has been found to be 1.1 mg m-2 d-1 and has large seasonal variation. The dry deposition flux is governed by atmospheric resistances, properties of deposition species as well as properties of underlying surfaces. The direct measurement of dry deposition flux is tedious, hence a model has been developed using empirical equations and incorporating meteorological data. The dry deposition flux of black carbon obtained by present parameterization model is in the range of dry deposition flux obtained by direct measurement.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A41G3026G
- Keywords:
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- 0305 Aerosols and particles;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0345 Pollution: urban and regional;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0365 Troposphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 3360 Remote sensing;
- ATMOSPHERIC PROCESSES