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| Titel |
Sensitivity of the regional European boreal climate to changes in surface properties resulting from structural vegetation perturbations |
| VerfasserIn |
J. H. Rydsaa, F. Stordal, L. M. Tallaksen |
| 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 ; 12, no. 10 ; Nr. 12, no. 10 (2015-05-27), S.3071-3087 |
| Datensatznummer |
250117949
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| Publikation (Nr.) |
 copernicus.org/bg-12-3071-2015.pdf |
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| Zusammenfassung |
| Amplified warming at high latitudes over the past few decades has led to changes
in the boreal and Arctic climate system such as structural changes in high-latitude ecosystems and soil moisture properties. These changes trigger
land–atmosphere feedbacks through altered energy partitioning in response
to changes in albedo and surface water fluxes. Local-scale changes in the
Arctic and boreal zones may propagate to affect large-scale climatic
features. In this study, MODIS land surface data are used with the Weather
Research and Forecasting model (WRF V3.5.1) and Noah land surface model (LSM), in a series of
experiments to investigate the sensitivity of the overlying atmosphere to
perturbations in the structural vegetation in the northern European boreal
ecosystem. Emphasis is placed on surface energy partitioning and near-surface atmospheric variables, and their response to observed and
anticipated land cover changes. We find that perturbations simulating
northward migration of evergreen needleleaf forest into tundra regions
cause an increase in latent rather than sensible heat fluxes during the
summer season. Shrub expansion in tundra areas has only small effects on
surface fluxes. Perturbations simulating the northward migration of mixed
forest across the present southern border of the boreal forest, have largely
opposite effects on the summer latent heat flux, i.e., they lead to a decrease
and act to moderate the overall mean regional effects of structural
vegetation changes on the near-surface atmosphere. |
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