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| Titel |
Southern high-latitude terrestrial climate change during the Palaeocene–Eocene derived from a marine pollen record (ODP Site 1172, East Tasman Plateau) |
| VerfasserIn |
L. Contreras, J. Pross, P. K. Bijl, R. B. O'Hara, J. I. Raine, A. Sluijs, H. Brinkhuis |
| 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. 4 ; Nr. 10, no. 4 (2014-07-24), S.1401-1420 |
| Datensatznummer |
250117019
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| Publikation (Nr.) |
 copernicus.org/cp-10-1401-2014.pdf |
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| Zusammenfassung |
| Reconstructing the early Palaeogene climate dynamics of terrestrial settings
in the high southern latitudes is important to assess the role of
high-latitude physical and biogeochemical processes in the global climate
system. However, whereas a number of high-quality Palaeogene climate records
has become available for the marine realm of the high southern latitudes over
the recent past, the long-term evolution of coeval terrestrial climates and
ecosystems is yet poorly known. We here explore the climate and vegetation
dynamics on Tasmania from the middle Palaeocene to the early Eocene
(60.7–54.2 Ma) based on a sporomorph record from Ocean Drilling Program
(ODP) Site 1172 on the East Tasman Plateau. Our results show that three
distinctly different vegetation types thrived on Tasmania under a
high-precipitation regime during the middle Palaeocene to early Eocene, with
each type representing different temperature conditions: (i) warm-temperate
forests dominated by gymnosperms that were dominant during the middle and
late Palaeocene (excluding the middle/late Palaeocene transition);
(ii) cool-temperate forests dominated by southern beech (Nothofagus)
and araucarians that transiently prevailed across the middle/late Palaeocene
transition interval (~ 59.5 to ~ 59.0 Ma); and
(iii) paratropical forests rich in ferns that were established during and in
the wake of the Palaeocene–Eocene Thermal Maximum (PETM). The transient
establishment of cool-temperate forests lacking any frost-sensitive elements
(i.e. palms and cycads) across the middle/late Palaeocene transition interval
indicates markedly cooler conditions, with the occurrence of frosts in
winter, on Tasmania during that time. The integration of our sporomorph data
with previously published TEX86-based sea-surface temperatures from ODP
Site 1172 documents that the vegetation dynamics on Tasmania were closely
linked with the temperature evolution in the Tasman sector of the Southwest
Pacific region. Moreover, the comparison of our season-specific climate
estimates for the sporomorph assemblages from ODP Site 1172 with the
TEX86L- and TEX86H-based temperature data
suggests a warm bias of both calibrations for the early Palaeogene of the high
southern latitudes. |
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