High resolution Termination 1 alkenone sea surface temperature (SST) reconstruction from Site 202-1233 in the Southeast Pacific ...

The termination of the last ice age (Termination 1; T1) is crucial for our understanding of global climate change and for the validation of climate models. There are still a number of open questions regarding for example the exact timing and the mechanisms involved in the initiation of deglaciation...

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Bibliographic Details
Main Authors: Lamy, Frank, Kaiser, Jérôme, Arz, Helge Wolfgang, Hebbeln, Dierk, Ninnemann, Ulysses S, Timm, Oliver, Timmermann, Axel, Toggweiler, J Robbie
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2007
Subjects:
Composite Core
Leg202
Joides Resolution
Ocean Drilling Program ODP
Antarc*
Antarctic
ice core
Online Access:https://dx.doi.org/10.1594/pangaea.659150
https://doi.pangaea.de/10.1594/PANGAEA.659150
Description
Summary:The termination of the last ice age (Termination 1; T1) is crucial for our understanding of global climate change and for the validation of climate models. There are still a number of open questions regarding for example the exact timing and the mechanisms involved in the initiation of deglaciation and the subsequent interhemispheric pattern of the warming. Our study is based on a well-dated and high-resolution alkenone-based sea surface temperature (SST) record from the SE-Pacific off southern Chile (Ocean Drilling Project Site 1233) showing that deglacial warming at the northern margin of the Antarctic Circumpolar Current system (ACC) began shortly after 19,000 years BP (19 kyr BP). The timing is largely consistent with Antarctic ice-core records but the initial warming in the SE-Pacific is more abrupt suggesting a direct and immediate response to the slowdown of the Atlantic thermohaline circulation through the bipolar seesaw mechanism. This response requires a rapid transfer of the Atlantic signal to the ... : Supplement to: Lamy, Frank; Kaiser, Jérôme; Arz, Helge Wolfgang; Hebbeln, Dierk; Ninnemann, Ulysses S; Timm, Oliver; Timmermann, Axel; Toggweiler, J Robbie (2007): Modulation of the bipolar seesaw in the Southeast Pacific during Termination 1. Earth and Planetary Science Letters, 259(3-4), 400-413 ...

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