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| Titel |
Impacts of peatland and permafrost changes on the terrestrial carbon storage over the last 21 ka |
| VerfasserIn |
Renato Spahni, Benjamin D. Stocker, Fortunat Joos |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250096255
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| Publikation (Nr.) |
 EGU/EGU2014-11751.pdf |
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| Zusammenfassung |
| Paleoclimate records and global climate-carbon cycle models suggest a net increase in land
carbon (C) storage between 300 and 700 Pg C (1 Pg C = 1015 g C) during the transition from
the last glacial maximum (LGM), the Holocene up to the preindustrial period. Peat
accumulation rate records imply an increase in peatland C of ~600 Pg C over the course of
the Holocene. In high northern latitudes mineral and organic soils are subject to permafrost
formation, which is believed to have been more extensive during glacial compared to
interglacial periods. Soil C in permafrost regions represents the largest inert C pool on land at
present. The spatio-temporal evolution, however, of C stocks in soils and vegetation remains
poorly quantified and is uncertain. Here, the Land surface Processes and eXchanges
(LPX-Bern) Dynamic Global Vegetation Model is applied in transient simulations to explore
the evolution of permafrost, peatland and vegetation C over the last 21’000 years. The
model is forced with temperature and precipitation output from the Trace-21ka
climate simulation, and dynamically simulates the formation and disappearance of
peatlands and permafrost soils, vegetation distribution and C stocks. Results indicate
that peatlands and permfrost areas existed further south in the LGM, in agreement
with available proxy information, and that their associated C was lost during the
transition into the Holocene. The simulated loss of inert C is over-compensated by
vegetation regrowth. The timing of the C relocation on land is compared to observational
evidence from paleoclimate archives and estimates from ocean C inventory changes. |
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