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| Titel |
The effects of aerosols on water cloud microphysics and macrophysics based on satellite-retrieved data over East Asia and the North Pacific |
| VerfasserIn |
T. Michibata, K. Kawamoto, T. Takemura |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 21 ; Nr. 14, no. 21 (2014-11-13), S.11935-11948 |
| Datensatznummer |
250119157
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| Publikation (Nr.) |
 copernicus.org/acp-14-11935-2014.pdf |
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| Zusammenfassung |
| This study examines the characteristics of the microphysics and
macrophysics of water clouds from East Asia to the North Pacific,
using data from active CloudSat radar measurements and passive MODerate-resolution Imaging Spectroradiometer (MODIS) retrievals. Our goals are to clarify
differences in microphysics and macrophysics between land and
oceanic clouds, seasonal differences unique to the midlatitudes,
characteristics of the drizzling process, and cloud vertical
structure. In pristine oceanic areas, fractional occurrences of
cloud optical thickness (COT) and cloud droplet effective radius
(CDR) increase systematically with an increase in drizzle intensity,
but these characteristics of the COT and CDR
transition are less evident in polluted land areas. In addition, regional and seasonal
differences are identified in terms of drizzle intensity as
a function of the liquid water path (LWP) and cloud droplet number
concentration (Nc). The correlations between drizzle
intensity and LWP, and between drizzle intensity and Nc,
are both more robust over oceanic areas than over land areas. We
also demonstrate regional and seasonal characteristics of the cloud
vertical structure. Our results suggest that aerosol–cloud interaction
mainly occurs around the cloud base in polluted land areas during
the winter season. In addition, a difference between polluted and
pristine areas in the efficiency of cloud droplet growth is
confirmed. These results suggest that water clouds over the
midlatitudes exhibit a different drizzle system to those over the
tropics. |
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