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| Titel |
Biogeophysical impacts of peatland forestation on regional climate changes in Finland |
| VerfasserIn |
Y. Gao, T. Markkanen, L. Backman, H. M. Henttonen, J.-P. Pietikäinen, H. M. Mäkelä, A. Laaksonen |
| 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 ; 11, no. 24 ; Nr. 11, no. 24 (2014-12-17), S.7251-7267 |
| Datensatznummer |
250117747
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| Publikation (Nr.) |
 copernicus.org/bg-11-7251-2014.pdf |
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| Zusammenfassung |
| Land cover changes can impact the climate by influencing the surface
energy and water balance. Naturally treeless or sparsely treed peatlands were extensively
drained to stimulate forest growth in Finland over the second half
of 20th century. The aim of this study is to investigate the
biogeophysical effects of peatland forestation on regional climate in
Finland. Two sets of 18-year climate simulations were done with the
regional climate model REMO by using land cover data based on
pre-drainage (1920s) and post-drainage (2000s) Finnish national
forest inventories.
In the most intensive peatland forestation area, located in the middle west of Finland, the results show a warming in April of up to 0.43 K in
monthly-averaged daily mean 2 m air temperature, whereas a slight
cooling from May to October of less than 0.1 K in general is found.
Consequently, snow clearance days over that area
are advanced up to 5 days in the mean of 15 years. No clear
signal is found for precipitation. Through analysing the simulated
temperature and energy balance terms, as well as snow depth over
five selected subregions, a positive feedback induced by peatland
forestation is found between decreased surface albedo and increased
surface air temperature in the snow-melting period. Our modelled
results show good qualitative agreements with the observational
data. In general, decreased surface albedo in the snow-melting period and
increased evapotranspiration in the growing period are the most
important biogeophysical aspects induced by peatland forestation
that cause changes in climate. The results from this study can be further integrally analysed with biogeochemical effects of peatland forestation
to provide background information for adapting future forest management to mitigate climate warming effects. Moreover, they
provide insights about the impacts of projected forestation of tundra at high latitudes due to climate change. |
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