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| Titel |
A global analysis of the impact of drought on net primary productivity |
| VerfasserIn |
T. Chen, G. R. Werf, R. A. M. Jeu, G. Wang, A. J. Dolman |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 10 ; Nr. 17, no. 10 (2013-10-11), S.3885-3894 |
| Datensatznummer |
250085952
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| Publikation (Nr.) |
 copernicus.org/hess-17-3885-2013.pdf |
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| Zusammenfassung |
| We investigated the impact of drought on interannual variability of net
primary productivity (NPP) from 1997 to 2009, using the standardized
precipitation evapotranspiration index (SPEI) drought index and
satellite-derived vegetation greenness converted to NPP. SPEI is positive
for wet conditions and negative for dry conditions. We found that SPEI and
NPP were coupled and showed in-phase behaviour on a global scale. We then
used the Köppen climate classification to study the SPEI–NPP relations
regionally and found that while NPP and SPEI were positively related (high
SPEI, high NPP) in arid and in seasonal dry regions, the opposite occurs in
most boreal regions (high SPEI, low NPP). High intensity drought events,
such as the 2003 drought in Europe were picked up by our analysis. Our
findings suggest that the strong positive relation between global average
moisture availability and NPP consists of a composite of the positive
relation across dry regions and the coherent NPP decline during and after
intensive drought events in humid regions. Importantly, we also found that
there are many areas on the globe that show no strong correlation between
drought and NPP. |
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