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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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.659150 2024-10-06T13:43:38+00:00 High resolution Termination 1 alkenone sea surface temperature (SST) reconstruction from Site 202-1233 in the Southeast Pacific Lamy, Frank Kaiser, Jérôme Arz, Helge Wolfgang Hebbeln, Dierk Ninnemann, Ulysses S Timm, Oliver Timmermann, Axel Toggweiler, J Robbie LATITUDE: -41.000080 * LONGITUDE: -74.449860 * DATE/TIME START: 2002-04-12T00:00:00 * DATE/TIME END: 2002-04-12T00:00:00 2007 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.659150 https://doi.org/10.1594/PANGAEA.659150 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.659150 https://doi.org/10.1594/PANGAEA.659150 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess 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, https://doi.org/10.1016/j.epsl.2007.04.040 202-1233 COMPCORE Composite Core Joides Resolution Leg202 Ocean Drilling Program ODP South-East Pacific dataset publication series 2007 ftpangaea https://doi.org/10.1594/PANGAEA.65915010.1016/j.epsl.2007.04.040 2024-09-11T00:15:18Z 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 SE-Pacific without involving the thermal inertia of the Southern Ocean that may contribute to the substantially more gradual deglacial temperature rise seen in Antarctic ice-cores. A very plausible mechanism for this rapid transfer is a seesaw-induced change of the coupled ocean–atmosphere system of the ACC and the southern westerly wind belt. In addition, modelling results suggest that insolation changes and the deglacial CO2 rise induced a substantial SST increase at our site location but with a gradual warming structure. The similarity of the two-step rise in our proxy SSTs and CO2 over T1 strongly demands for a forcing mechanism influencing both, temperature and CO2. As SSTs at our coring site are particularly sensitive to latitudinal shifts of the ACC/southern westerly wind belt system, we conclude that such latitudinal shifts may substantially affect the upwelling of deepwater masses in the Southern Ocean and thus the release of CO2 to the atmosphere as suggested by the conceptual model of [Toggweiler, ... Other/Unknown Material Antarc* Antarctic ice core Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Southern Ocean The Antarctic Pacific ENVELOPE(-74.449860,-74.449860,-41.000080,-41.000080) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
202-1233 COMPCORE Composite Core Joides Resolution Leg202 Ocean Drilling Program ODP South-East Pacific |
spellingShingle |
202-1233 COMPCORE Composite Core Joides Resolution Leg202 Ocean Drilling Program ODP South-East Pacific Lamy, Frank Kaiser, Jérôme Arz, Helge Wolfgang Hebbeln, Dierk Ninnemann, Ulysses S Timm, Oliver Timmermann, Axel Toggweiler, J Robbie High resolution Termination 1 alkenone sea surface temperature (SST) reconstruction from Site 202-1233 in the Southeast Pacific |
topic_facet |
202-1233 COMPCORE Composite Core Joides Resolution Leg202 Ocean Drilling Program ODP South-East Pacific |
description |
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 SE-Pacific without involving the thermal inertia of the Southern Ocean that may contribute to the substantially more gradual deglacial temperature rise seen in Antarctic ice-cores. A very plausible mechanism for this rapid transfer is a seesaw-induced change of the coupled ocean–atmosphere system of the ACC and the southern westerly wind belt. In addition, modelling results suggest that insolation changes and the deglacial CO2 rise induced a substantial SST increase at our site location but with a gradual warming structure. The similarity of the two-step rise in our proxy SSTs and CO2 over T1 strongly demands for a forcing mechanism influencing both, temperature and CO2. As SSTs at our coring site are particularly sensitive to latitudinal shifts of the ACC/southern westerly wind belt system, we conclude that such latitudinal shifts may substantially affect the upwelling of deepwater masses in the Southern Ocean and thus the release of CO2 to the atmosphere as suggested by the conceptual model of [Toggweiler, ... |
format |
Other/Unknown Material |
author |
Lamy, Frank Kaiser, Jérôme Arz, Helge Wolfgang Hebbeln, Dierk Ninnemann, Ulysses S Timm, Oliver Timmermann, Axel Toggweiler, J Robbie |
author_facet |
Lamy, Frank Kaiser, Jérôme Arz, Helge Wolfgang Hebbeln, Dierk Ninnemann, Ulysses S Timm, Oliver Timmermann, Axel Toggweiler, J Robbie |
author_sort |
Lamy, Frank |
title |
High resolution Termination 1 alkenone sea surface temperature (SST) reconstruction from Site 202-1233 in the Southeast Pacific |
title_short |
High resolution Termination 1 alkenone sea surface temperature (SST) reconstruction from Site 202-1233 in the Southeast Pacific |
title_full |
High resolution Termination 1 alkenone sea surface temperature (SST) reconstruction from Site 202-1233 in the Southeast Pacific |
title_fullStr |
High resolution Termination 1 alkenone sea surface temperature (SST) reconstruction from Site 202-1233 in the Southeast Pacific |
title_full_unstemmed |
High resolution Termination 1 alkenone sea surface temperature (SST) reconstruction from Site 202-1233 in the Southeast Pacific |
title_sort |
high resolution termination 1 alkenone sea surface temperature (sst) reconstruction from site 202-1233 in the southeast pacific |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.659150 https://doi.org/10.1594/PANGAEA.659150 |
op_coverage |
LATITUDE: -41.000080 * LONGITUDE: -74.449860 * DATE/TIME START: 2002-04-12T00:00:00 * DATE/TIME END: 2002-04-12T00:00:00 |
long_lat |
ENVELOPE(-74.449860,-74.449860,-41.000080,-41.000080) |
geographic |
Antarctic Southern Ocean The Antarctic Pacific |
geographic_facet |
Antarctic Southern Ocean The Antarctic Pacific |
genre |
Antarc* Antarctic ice core Southern Ocean |
genre_facet |
Antarc* Antarctic ice core Southern Ocean |
op_source |
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, https://doi.org/10.1016/j.epsl.2007.04.040 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.659150 https://doi.org/10.1594/PANGAEA.659150 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.65915010.1016/j.epsl.2007.04.040 |
_version_ |
1812182192790437888 |