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| Titel |
The MIS 11 – MIS 1 analogy, southern European vegetation, atmospheric methane and the "early anthropogenic hypothesis" |
| VerfasserIn |
P. C. Tzedakis |
| 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 ; 6, no. 2 ; Nr. 6, no. 2 (2010-03-17), S.131-144 |
| Datensatznummer |
250003439
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| Publikation (Nr.) |
 copernicus.org/cp-6-131-2010.pdf |
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| Zusammenfassung |
| Marine Isotope Stage (MIS) 11 has been considered a potential analogue for
the Holocene and its future evolution. However, a dichotomy has emerged over
the precise chronological alignment of the two intervals, with one solution
favouring a synchronization of the precession signal and another of the
obliquity signal. The two schemes lead to different implications over the
natural length of the current interglacial and the underlying causes of the
evolution of greenhouse gas concentrations. Here, the close coupling
observed between changes in southern European tree populations and
atmospheric methane concentrations in previous interglacials is used to
evaluate the natural vs. anthropogenic contribution to Holocene methane
emissions and assess the two alignment schemes. Comparison of the vegetation
trends in MIS 1 and MIS 11 favours a precessional alignment, which would
suggest that the Holocene is nearing the end of its natural course. This,
combined with the divergence between methane concentrations and temperate
tree populations after 5 kyr BP, provides some support for the notion that
the Holocene methane trend may be anomalous compared to previous
interglacials. In contrast, comparison of MIS 1 with MIS 19, which may
represent a closer astronomical analogue than MIS 11, leads to substantially
different conclusions on the projected natural duration of the current
interglacial and the extent of the anthropogenic contribution to the
Holocene methane budget. As answers vary with the choice of analogue,
resolution of these issues using past interglacials remains elusive. |
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