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| Titel |
Role of sea surface temperature responses in simulation of the climatic effect of mineral dust aerosol |
| VerfasserIn |
X. Yue, H. Liao, H. J. Wang, S. L. Li, J. P. Tang |
| 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 ; 11, no. 12 ; Nr. 11, no. 12 (2011-06-28), S.6049-6062 |
| Datensatznummer |
250009873
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| Publikation (Nr.) |
 copernicus.org/acp-11-6049-2011.pdf |
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| Zusammenfassung |
| Mineral dust aerosol can be transported over the nearby
oceans and influence the energy balance at the sea surface. The role of
dust-induced sea surface temperature (SST) responses in simulations of the
climatic effect of dust is examined by using a general circulation model
with online simulation of mineral dust and a coupled mixed-layer ocean
model. Both the longwave and shortwave radiative effects of mineral dust
aerosol are considered in climate simulations. The SST responses are found
to be very influential on simulated dust-induced climate change, especially
when climate simulations consider the two-way dust-climate coupling to
account for the feedbacks. With prescribed SSTs and dust concentrations, we
obtain an increase of 0.02 K in the global and annual mean surface air
temperature (SAT) in response to dust radiative effects. In contrast, when
SSTs are allowed to respond to radiative forcing of dust in the presence of
the dust cycle-climate interactions, we obtain a global and annual mean
cooling of 0.09 K in SAT by dust. The extra cooling simulated with the SST
responses can be attributed to the following two factors: (1) The negative
net (shortwave plus longwave) radiative forcing of dust at the surface
reduces SST, which decreases latent heat fluxes and upward transport of
water vapor, resulting in less warming in the atmosphere; (2) The positive
feedback between SST responses and dust cycle. The dust-induced reductions
in SST lead to reductions in precipitation (or wet deposition of dust) and
hence increase the global burden of small dust particles. These small
particles have strong scattering effects, which enhance the dust cooling at
the surface and further reduce SSTs. |
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