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| Titel |
Impact of CO2 and climate on Last Glacial maximum vegetation – a factor separation |
| VerfasserIn |
M. Claussen, K. Selent, V. Brovkin, T. Raddatz, V. Gayler |
| 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 ; 10, no. 6 ; Nr. 10, no. 6 (2013-06-03), S.3593-3604 |
| Datensatznummer |
250018271
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| Publikation (Nr.) |
 copernicus.org/bg-10-3593-2013.pdf |
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| Zusammenfassung |
| The factor separation of Stein and Alpert (1993) is applied to simulations
with the MPI Earth system model to determine the factors which cause the
differences between vegetation patterns in glacial and pre-industrial
climate. The factors firstly include differences in the climate, caused by a
strong increase in ice masses and the radiative effect of lower greenhouse
gas concentrations; secondly, differences in the ecophysiological effect of
lower glacial atmospheric CO2 concentrations; and thirdly, the synergy
between the pure climate effect and the pure effect of changing
physiologically available CO2. It is has been shown that the synergy can
be interpreted as a measure of the sensitivity of ecophysiological CO2
effect to climate. The pure climate effect mainly leads to a contraction or a
shift in vegetation patterns when comparing simulated glacial and
pre-industrial vegetation patterns. Raingreen shrubs benefit from the colder
and drier climate. The pure ecophysiological effect of CO2 appears to be
stronger than the pure climate effect for many plant functional types – in
line with previous simulations. The pure ecophysiological effect of lower
CO2 mainly yields a reduction in fractional coverage, a thinning of
vegetation and a strong reduction in net primary production. The synergy
appears to be as strong as each of the pure contributions locally, but weak
on global average for most plant functional types. For tropical evergreen
trees, however, the synergy is strong on global average. It diminishes the
difference between glacial and pre-industrial coverage of tropical evergreen
trees, due to the pure climate effect and the pure ecophysiological CO2
effect, by approximately 50 per cent. |
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