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| Titel |
The great Indian haze revisited: aerosol distribution effects on microphysical and optical properties of warm clouds over peninsular India |
| VerfasserIn |
R. Ghanti, S. Ghosh |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Precipitation: Measurement, Climatology, Remote Sensing, and Modeling (EGU Session 2009) ; Nr. 25 (2010-03-10), S.51-54 |
| Datensatznummer |
250015736
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| Publikation (Nr.) |
 copernicus.org/adgeo-25-51-2010.pdf |
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| Zusammenfassung |
| The Indian subcontinent is undergoing a phase of rapid
urbanisation. Inevitable fallout of this process is a concomitant increase
in air pollution much of which can be attributed to the infamous great
Indian haze phenomena. One observes that the aerosol size distributions vary
considerably along the Bay of Bengal (BOB), Arabian Sea (AS) and the Indian
Ocean (IO), although, the dynamical attributes are very similar,
particularly over the BOB and the AS during this season. Unlike major
European studies (e.g. Aerosol Characterization Experiment-2, Ghosh et al.,
2005), there are no cloud microphysical modelling studies to complement
these observational results for the Indian sub-continent. Ours is the first
modelling study over this important region where a time-tested model (O'Dowd
et al., 1999a; Ghosh et al., 2007; Rap et al., 2009) is used to obtain cloud
microphysical and optical properties from observed aerosol size
distributions. Un-activated aerosol particles and very small cloud droplets
have to be treated specially to account for non-ideal effects-our model does
this effectively yielding realistic estimate of cloud droplet number
concentrations (Nc). Empirical relationships linking aerosol concentration
to (Nc) yield a disproportionately higher Nc suggesting that such empirical
formulations should be used with caution. Our modelling study reveals that
the cloud's microphysical and optical properties are very similar along the
AS and the BOB despite them having disparate dry aerosol spectral
distributions. This is non-intuitive, as one would expect changes in
microphysical development with widely different aerosol distributions. There
is some increase in cloud droplet numbers with increased haze concentrations
but much less than a simple proportion would indicate. |
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