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| Titel |
Influence of dynamic vegetation on climate change and terrestrial carbon storage in the Last Glacial Maximum |
| VerfasserIn |
R. O'ishi, A. Abe-Ouchi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 4 ; Nr. 9, no. 4 (2013-07-22), S.1571-1587 |
| Datensatznummer |
250018093
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| Publikation (Nr.) |
 copernicus.org/cp-9-1571-2013.pdf |
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| Zusammenfassung |
| When the climate is reconstructed from paleoevidence, it
shows that the Last Glacial Maximum (LGM, ca. 21 000 yr ago) is cold and
dry compared to the present-day. Reconstruction also shows that compared to
today, the vegetation of the LGM is less active and the distribution of
vegetation was drastically different, due to cold temperature, dryness, and a
lower level of atmospheric CO2 concentration (185 ppm compared to a
preindustrial level of 285 ppm). In the present paper, we investigate the
influence of vegetation change on the climate of the LGM by using a coupled
atmosphere-ocean-vegetation general circulation model (AOVGCM, the
MIROC-LPJ). The MIROC-LPJ is different from earlier studies in the
introduction of a bias correction method in individual running GCM
experiments. We examined four GCM experiments (LGM and preindustrial, with
and without vegetation feedback) and quantified the strength of the
vegetation feedback during the LGM. The result shows that global-averaged
cooling during the LGM is amplified by +13.5 % due to the introduction of
vegetation feedback. This is mainly caused by the increase of land surface
albedo due to the expansion of tundra in northern high latitudes and the
desertification in northern middle latitudes around 30° N to
60° N. We also investigated how this change in climate affected the
total terrestrial carbon storage by using offline Lund-Potsdam-Jena dynamic
global vegetation model (LPJ-DGVM). Our result shows that the total
terrestrial carbon storage was reduced by 597 PgC during the LGM, which
corresponds to the emission of 282 ppm atmospheric CO2. In the LGM
experiments, the global carbon distribution is generally the same whether the
vegetation feedback to the atmosphere is included or not. However, the
inclusion of vegetation feedback causes substantial terrestrial carbon
storage change, especially in explaining the lowering of atmospheric CO2
during the LGM. |
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