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| Titel |
A mid-Holocene climate reconstruction for eastern South America |
| VerfasserIn |
L. F. Prado, I. Wainer, C. M. Chiessi, M.-P. Ledru, B. Turcq |
| 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 ; 9, no. 5 ; Nr. 9, no. 5 (2013-09-09), S.2117-2133 |
| Datensatznummer |
250085221
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| Publikation (Nr.) |
 copernicus.org/cp-9-2117-2013.pdf |
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| Zusammenfassung |
| The mid-Holocene (6000 calibrated years before present) is a key period in
palaeoclimatology because incoming summer insolation was lower than during
the late Holocene in the Southern Hemisphere, whereas the opposite happened
in the Northern Hemisphere. However, the effects of the decreased austral
summer insolation over South American climate have been poorly discussed by
palaeodata syntheses. In addition, only a few of the regional studies have
characterised the mid-Holocene climate in South America through a multiproxy
approach. Here, we present a multiproxy compilation of mid-Holocene
palaeoclimate data for eastern South America. We compiled 120
palaeoclimatological datasets, which were published in 84 different papers.
The palaeodata analysed here suggest a water deficit scenario in the
majority of eastern South America during the mid-Holocene if compared to the
late Holocene, with the exception of northeastern Brazil. Low mid-Holocene
austral summer insolation caused a reduced land–sea temperature contrast and
hence a weakened South American monsoon system circulation. This scenario is
represented by a decrease in precipitation over the South Atlantic
Convergence Zone area, saltier conditions along the South American
continental margin, and lower lake levels. |
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