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| Titel |
The sensitivity of tropical convective precipitation to the direct radiative forcings of black carbon aerosols emitted from major regions |
| VerfasserIn |
C. Wang |
| 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 ; 27, no. 10 ; Nr. 27, no. 10 (2009-10-02), S.3705-3711 |
| Datensatznummer |
250016662
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| Publikation (Nr.) |
 copernicus.org/angeo-27-3705-2009.pdf |
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| Zusammenfassung |
| Previous works have suggested that the direct radiative forcing (DRF) of
black carbon (BC) aerosols are able to force a significant change in
tropical convective precipitation ranging from the Pacific and Indian Ocean
to the Atlantic Ocean. In this in-depth analysis, the sensitivity of this
modeled effect of BC on tropical convective precipitation to the emissions
of BC from 5 major regions of the world has been examined. In a zonal mean
base, the effect of BC on tropical convective precipitation is a result of a
displacement of ITCZ toward the forcing (warming) hemisphere. However, a
substantial difference exists in this effect associated with BC over
different continents. The BC effect on convective precipitation over the
tropical Pacific Ocean is found to be most sensitive to the emissions from
Central and North America due to a persistent presence of BC aerosols from
these two regions in the lowermost troposphere over the Eastern Pacific. The
BC effect over the tropical Indian and Atlantic Ocean is most sensitive to
the emissions from South as well as East Asia and Africa, respectively.
Interestingly, the summation of these individual effects associated with
emissions from various regions mostly exceeds their actual combined effect
as shown in the model run driven by the global BC emissions, so that they
must offset each other in certain locations and a nonlinearity of this type
of effect is thus defined. It is known that anthropogenic aerosols contain
many scattering-dominant constituents that might exert an effect opposite to
that of absorbing BC. The combined aerosol forcing is thus likely differing
from the BC-only one. Nevertheless, this study along with others of its kind
that isolates the DRF of BC from other forcings provides an insight of the
potentially important climate response to anthropogenic forcings
particularly related to the unique particulate solar absorption. |
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