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| Titel |
Do land surface models need to include differential plant species responses to drought? Examining model predictions across a mesic-xeric gradient in Europe |
| VerfasserIn |
M. G. De Kauwe, S.-X. Zhou, B. E. Medlyn, A. J. Pitman, Y.-P. Wang, R. A. Duursma, I. C. Prentice |
| 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. 24 ; Nr. 12, no. 24 (2015-12-21), S.7503-7518 |
| Datensatznummer |
250118223
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| Publikation (Nr.) |
 copernicus.org/bg-12-7503-2015.pdf |
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| Zusammenfassung |
| Future climate change has the potential to increase drought in many regions
of the globe, making it essential that land surface models (LSMs) used in
coupled climate models realistically capture the drought responses of
vegetation. Recent data syntheses show that drought sensitivity varies
considerably among plants from different climate zones, but state-of-the-art
LSMs currently assume the same drought sensitivity for all vegetation. We
tested whether variable drought sensitivities are needed to explain the
observed large-scale patterns of drought impact on the carbon, water and
energy fluxes. We implemented data-driven drought sensitivities in the
Community Atmosphere Biosphere Land Exchange (CABLE) LSM and evaluated
alternative sensitivities across a latitudinal gradient in Europe during the
2003 heatwave. The model predicted an overly abrupt onset of drought unless
average soil water potential was calculated with dynamic weighting across
soil layers. We found that high drought sensitivity at the most mesic sites,
and low drought sensitivity at the most xeric sites, was necessary to
accurately model responses during drought. Our results indicate that LSMs
will over-estimate drought impacts in drier climates unless different
sensitivity of vegetation to drought is taken into account. |
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