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| Titel |
A study on the direct effect of anthropogenic aerosols on near surface air temperature over Southeastern Europe during summer 2000 based on regional climate modeling |
| VerfasserIn |
P. Zanis |
| 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 (2009-10-21), S.3977-3988 |
| Datensatznummer |
250016686
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| Publikation (Nr.) |
 copernicus.org/angeo-27-3977-2009.pdf |
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| Zusammenfassung |
| In the present work it is investigated the direct shortwave effect of
anthropogenic aerosols on the near surface temperature over Southeastern
Europe and the atmospheric circulation during summer 2000. In summer 2000, a
severe heat-wave and droughts affected many countries in the Balkans. The
study is based on two yearly simulations with and without the aerosol
feedback of the regional climate model RegCM3 coupled with a simplified
aerosol model. The surface radiative forcing associated with the
anthropogenic aerosols is negative throughout the European domain with the
more negative values in Central and Central-eastern Europe. A basic pattern
of the aerosol induced changes in air temperature at the lower troposphere
is a decrease over Southeastern Europe and the Balkan Peninsula (up to about
1.2°C) thus weakening the pattern of the climatic temperature
anomalies of summer 2000. The aerosol induced changes in air temperature
from the lower troposphere to upper troposphere are not correlated with the
respective pattern of the surface radiative forcing implying the complexity
of the mechanisms linking the aerosol radiative forcing with the induced
atmospheric changes through dynamical feedbacks of aerosols on atmospheric
circulation. Investigation of the aerosol induced changes in the circulation
indicates a southward shift of the subtropical jet stream playing a dominant
role for the decrease in near surface air temperature over Southeastern
Europe and the Balkan Peninsula. The southward shift of the jet exit region
over the Balkan Peninsula causes a relative increase of the upward motion at
the northern flank of the jet exit region, a relative increase of clouds,
less solar radiation absorbed at the surface and hence relative cooler air
temperatures in the lower troposphere between 45° N and 50° N. The
southward extension of the lower troposphere aerosol induced negative
temperature changes in the latitudinal band 35° N–45° N over the
Balkan Peninsula is justified from the prevailing northerly flow advecting
the relatively cooler air from the latitudinal band 45° N–50° N
towards the lower latitudes. The present regional climate modeling study
indicates the important role of anthropogenic aerosols for the regional
climate and their dynamical feedback on atmospheric circulation. |
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