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| Titel |
The importance of Northern Peatlands in global carbon systems during the Holocene |
| VerfasserIn |
Y. Wang, N. T. Roulet, S. Frolking, L. A. Mysak |
| 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 ; 5, no. 4 ; Nr. 5, no. 4 (2009-11-11), S.683-693 |
| Datensatznummer |
250002697
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| Publikation (Nr.) |
 copernicus.org/cp-5-683-2009.pdf |
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| Zusammenfassung |
| We applied an inverse model to simulate global carbon (C) cycle dynamics
during the Holocene period using atmospheric carbon dioxide (CO2)
concentrations reconstructed from Antarctic ice cores and prescribed C
accumulation rates of Northern Peatlands (NP) as inputs. Previous studies
indicated that different sources could contribute to the 20 parts per million
by volume (ppmv) atmospheric CO2 increase over the past 8000 years. These
sources of C include terrestrial release of 40–200 petagram C (PgC, 1
petagram=1015 gram), deep oceanic adjustment to a 500 PgC
terrestrial biomass buildup early in this interglacial period, and
anthropogenic land-use and land-cover changes of unknown magnitudes. Our
study shows that the prescribed peatland C accumulation significantly
modifies our previous understanding of Holocene C cycle dynamics. If the
buildup of the NP is considered, the terrestrial pool becomes the C sink of
about 160–280 PgC over the past 8000 years, and the only C source for the
terrestrial and atmospheric C increases is presumably from the deep ocean due
to calcium carbonate compensation. Future studies need to be conducted to
constrain the basal times and growth rates of the NP C accumulation in the
Holocene. These research endeavors are challenging because they need a
dynamically-coupled peatland simulator to be constrained with the initiation
time and reconstructed C reservoir of the NP. Our results also suggest that
the huge reservoir of deep ocean C explains the major variability of the
glacial-interglacial C cycle dynamics without considering the anthropogenic C
perturbation. |
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