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| Titel |
Combined biogeophysical and biogeochemical effects of large-scale forest cover changes in the MPI earth system model |
| VerfasserIn |
S. Bathiany, M. Claussen, V. Brovkin, T. Raddatz, V. Gayler |
| 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 ; 7, no. 5 ; Nr. 7, no. 5 (2010-05-04), S.1383-1399 |
| Datensatznummer |
250004760
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| Publikation (Nr.) |
 copernicus.org/bg-7-1383-2010.pdf |
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| Zusammenfassung |
| Afforestation and reforestation have become popular instruments of climate
mitigation policy, as forests are known to store large quantities of carbon.
However, they also modify the fluxes of energy, water and momentum at the
land surface. Previous studies have shown that these biogeophysical effects
can counteract the carbon drawdown and, in boreal latitudes, even
overcompensate it due to large albedo differences between forest canopy and
snow. This study investigates the role forest cover plays for global climate
by conducting deforestation and afforestation experiments with the earth
system model of the Max Planck Institute for Meteorology (MPI-ESM). Complete
deforestation of the tropics (18.75° S–15° N) exerts a
global warming of 0.4 °C due to an increase in CO2 concentration
by initially 60 ppm and a decrease in evapotranspiration in the deforested
areas. In the northern latitudes (45° N–90° N), complete
deforestation exerts a global cooling of 0.25 °C after 100 years,
while afforestation leads to an equally large warming, despite the
counteracting changes in CO2 concentration. Earlier model studies are
qualitatively confirmed by these findings. As the response of temperature as
well as terrestrial carbon pools is not of equal sign at every land cell,
considering forests as cooling in the tropics and warming in high latitudes
seems to be true only for the spatial mean, but not on a local scale. |
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