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| Titel |
A seasonality trigger for carbon injection at the Paleocene-Eocene Thermal Maximum |
| VerfasserIn |
J. S. Eldrett, D. R. Greenwood, M. Polling, H. Brinkhuis, A. Sluijs |
| 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 ; 10, no. 2 ; Nr. 10, no. 2 (2014-04-16), S.759-769 |
| Datensatznummer |
250116951
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| Publikation (Nr.) |
 copernicus.org/cp-10-759-2014.pdf |
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| Zusammenfassung |
| The Paleocene–Eocene Thermal Maximum (PETM) represents a ~170 kyr
episode of anomalous global warmth ~56 Ma ago. The
PETM is associated with rapid and massive injections of 13C-depleted
carbon into the ocean–atmosphere system reflected as a prominent negative
carbon isotope excursion (CIE) in sedimentary components. Earth's surface
and deep ocean waters warmed by ~5 °C, of which
part may have occurred prior to the CIE. However, few records document
continental climatic trends and changes in seasonality have not been
documented. Here we present the first high-resolution vegetation and
paleoclimate reconstructions for the PETM, based on nearest living relative
analysis of terrestrially derived spore and pollen assemblages preserved in
an expanded section from the central North Sea. Our data indicate reductions
in boreal conifers and an increase in mesothermal to megathermal taxa,
reflecting a shift towards wetter and warmer climate. We also record an
increase in summer temperatures, greater in magnitude than the rise in mean
annual temperature changes, and a shift to a summer-wet seasonality. Within
the CIE, vegetation varies significantly with initial increases in epiphytic
and climbing ferns, and development of extensive wetlands, followed by
abundance of Carya spp. indicative of broadleaf forest colonization. Critically,
the change in vegetation we report occurs prior to the CIE, and is
concomitant with anomalous marine ecological change, as represented by the
occurrence of Apectodinium augustum. This suggests that amplifications of seasonal extremes
triggered carbon injection. |
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