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| Titel |
Temporal heterogeneity in aerosol characteristics and the resulting radiative impacts at a tropical coastal station – Part 2: Direct short wave radiative forcing |
| VerfasserIn |
S. Suresh Babu, K. Krishna Moorthy, S. K. Satheesh |
| 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 ; 25, no. 11 ; Nr. 25, no. 11 (2007-11-29), S.2309-2320 |
| Datensatznummer |
250015942
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| Publikation (Nr.) |
 copernicus.org/angeo-25-2309-2007.pdf |
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| Zusammenfassung |
| Seasonal distinctiveness in the microphysical and optical properties of
columnar and near-surface (in the well mixed region) aerosols, associated
with changes in the prevailing synoptic conditions, were delineated based on
extensive (spread over 4 years) and collocated measurements at the tropical
coastal location, Trivandrum (8.55° N; 76.97° E, 3 m a.m.s.l.), and the
results were summarized in Part 1 of this two-part paper. In Part 2, we
use these properties to develop empirical seasonal aerosol models, which
represent the observed features fairly accurately, separately for winter
monsoon season (WMS, December through March), inter-monsoon season (IMS,
April and May), summer monsoon season (SMS, June through September) and post
monsoon season (PMS, October and November). The models indicate a
significant transformation in the aerosol environment from an
anthropogenic-dominance in WMS to a natural-dominance in SMS. The modeled
aerosol properties are used for estimating the direct, short wave aerosol
radiative forcing, under clear-sky conditions. Our estimates show large
seasonal changes. Under clear sky conditions, the daily averaged short-wave
TOA forcing changes from its highest values during WMS, to the lowest values
in SMS; this seasonal change being brought-in mainly by the reduction in the
abundance and the mass fraction (to the composite) of black carbon aerosols
and of accumulation mode aerosols. The resulting atmospheric forcing varies
from the highest, (47 to 53 W m−2) in WMS to the lowest (22 to 26 W m−2) in SMS. |
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