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| Titel |
The influence of land cover change in the Asian monsoon region on present-day and mid-Holocene climate |
| VerfasserIn |
A. Dallmeyer, M. Claussen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 6 ; Nr. 8, no. 6 (2011-06-10), S.1499-1519 |
| Datensatznummer |
250005952
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| Publikation (Nr.) |
 copernicus.org/bg-8-1499-2011.pdf |
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| Zusammenfassung |
Using the general circulation model ECHAM5/JSBACH, we investigate the
biogeophysical effect of large-scale afforestation and deforestation in the
Asian monsoon domain on present-day and mid-Holocene climate. We demonstrate
that the applied land cover change does not only modify the local climate
but also change the climate in North Africa and the Middle East via
teleconnections. Deforestation in the Asian monsoon domain enhances the
rainfall in North Africa. In parts of the Sahara summer precipitation is
more than doubled. In contrast, afforestation strongly decreases summer
rainfall in the Middle East and even leads to the cessation of the
rainfall-activity in some parts of this region.
Regarding the local climate, deforestation results in a reduction of
precipitation and a cooler climate as grass mostly has a higher albedo than
forests. However, in the core region of the Asian monsoon the decrease in
evaporative cooling in the monsoon season overcompensates this signal and
results in a net warming. Afforestation has mainly the opposite effect,
although the pattern of change is less clear. It leads to more precipitation
in most parts of the Asian monsoon domain and a warmer climate except for
the southern regions where a stronger evaporation decreases near-surface
temperatures in the monsoon season.
When prescribing mid-Holocene insolation, the pattern of local precipitation
change differs. Afforestation particularly increases monsoon rainfall in the
region along the Yellow River which was the settlement area of major
prehistoric cultures. In this region, the effect of land cover change on
precipitation is half as large as the orbitally-induced precipitation
change. Thus, our model results reveal that mid- to late-Holocene land cover
change could strongly have contributed to the decreasing Asian monsoon
precipitation during the Holocene known from reconstructions. |
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