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| Titel |
Effect of mosaic representation of vegetation in land surface schemes on simulated energy and carbon balances |
| VerfasserIn |
R. Li, V. K. Arora |
| 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 ; 9, no. 1 ; Nr. 9, no. 1 (2012-01-31), S.593-605 |
| Datensatznummer |
250006684
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| Publikation (Nr.) |
 copernicus.org/bg-9-593-2012.pdf |
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| Zusammenfassung |
| Energy and carbon balance implications of representing vegetation using a
composite or mosaic approach in a land surface scheme are investigated. In
the composite approach the attributes of different plant functional types
(PFTs) present in a grid cell are aggregated in some fashion for energy and
water balance calculations. The resulting physical environmental conditions
(including net radiation, soil moisture and soil temperature) are common to
all PFTs and affect their ecosystem processes. In the mosaic approach energy
and water balance calculations are performed separately for each PFT tile
using its own vegetation attributes, so each PFT "sees" different physical
environmental conditions and its carbon balance evolves somewhat differently
from that in the composite approach. Simulations are performed at selected
boreal, temperate and tropical locations to illustrate the differences
caused by using the composite versus mosaic approaches of representing
vegetation. These idealized simulations use 50% fractional coverage for
each of the two dominant PFTs in a grid cell. Differences in simulated grid
averaged primary energy fluxes at selected sites are generally less than
5% between the two approaches. Simulated grid-averaged carbon fluxes and
pool sizes at these sites can, however, differ by as much as 46%.
Simulation results suggest that differences in carbon balance between the
two approaches arise primarily through differences in net radiation which
directly affects net primary productivity, and thus leaf area index and
vegetation biomass. |
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