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| Titel |
Aerosol transport over the Gangetic basin during ISRO-GBP land campaign-II |
| VerfasserIn |
M. Aloysius, M. Mohan, K. Parameswaran, S. K. George, P. R. Nair |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 26, no. 3 ; Nr. 26, no. 3 (2008-03-26), S.431-440 |
| Datensatznummer |
250016035
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| Publikation (Nr.) |
 copernicus.org/angeo-26-431-2008.pdf |
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| Zusammenfassung |
| MODIS (Moderate Resolution Imaging Spectroradiometer) Level-3 aerosol
optical depth (AOD) data and NCEP (National Centre for Environmental
Prediction) reanalysis winds were incorporated into an aerosol flux
continuity equation, for a quantitative assessment of the sources of aerosol
generation over the Ganga basin in the winter month of December 2004.
Preliminary analysis on the aerosol distribution and wind fields showed wind
convergence to be an important factor which, supported by the regional topography,
confines aerosols in a long band over the Indo Gangetic plain (IGP)
stretching from the west of the Thar desert into the Head-Bay-of-Bengal. The
prevailing winds of the season carry the aerosols from Head-Bay-of-Bengal
along the east coast as far as the southern tip of the peninsular India. A
detailed examination of MODIS data revealed significant day-to-day
variations in aerosol loading in localised pockets over the central and
eastern parts of the Indo Gangetic plain during the second half of December,
with AOD values even exceeding unity. Aerosols over the Ganga basin were
dominated by fine particles (geometric mean radius ~0.05–0.1μm)
while those over the central and western India were dominated by large
particles (geometric mean radius ~0.3–0.7μ). Before
introducing it into the flux equation, the MODIS derived AOD was validated
through a comparison with the ground-based measurements collected at
Kharagpur and Kanpur; two stations located over the Ganga basin. The strength
of the aerosol generation computed using the flux equation indicated the existence
of aerosol sources whose locations almost coincided with the concentration
of thermal power plants. The quantitative agreement between the source
strength and the power plant concentration, with a correlation coefficient
0.85, pointed to thermal power plants as substantial contributors to the
high aerosol loading over the Ganga Basin in winter. The layout of aerosol
sources also nearly matched the spatial distribution of the Respirable
Suspended Particulate Matter (RSPM), derived from the Central Pollution
Control Board (CPCB) data, lending additional support to our inference. |
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