Paleotemperature reconstructions on sediment core GIK161603-3
Different proxies for sea surface temperature (SST) often exhibit divergent trends for deglacial warming in tropical regions, hampering our understanding of the phase relationship between tropical SSTs and continental ice volume at glacial terminations. To reconcile divergent SST trends, we report r...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.820004 2023-05-15T13:42:11+02:00 Paleotemperature reconstructions on sediment core GIK161603-3 Wang, Yiming V Leduc, Guillaume Regenberg, Marcus Andersen, Nils Larsen, Thomas Blanz, Thomas Schneider, Ralph R LATITUDE: -18.241200 * LONGITUDE: 37.868500 * DATE/TIME START: 2008-03-15T09:21:00 * DATE/TIME END: 2008-03-15T09:21:00 2013-10-04 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.820004 https://doi.org/10.1594/PANGAEA.820004 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.820004 https://doi.org/10.1594/PANGAEA.820004 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Wang, Yiming V; Leduc, Guillaume; Regenberg, Marcus; Andersen, Nils; Larsen, Thomas; Blanz, Thomas; Schneider, Ralph R (2013): Northern and southern hemisphere controls on seasonal sea surface temperatures in the Indian Ocean during the last deglaciation. Paleoceanography, 28(4), 619-632, https://doi.org/10.1002/palo.20053 GIK/IfG GIK16160-3 Gravity corer (Kiel type) Institute for Geosciences Christian Albrechts University Kiel M75/3 M75/3_137-3 Meteor (1986) Sambesi Fan SL Dataset 2013 ftpangaea https://doi.org/10.1594/PANGAEA.820004 https://doi.org/10.1002/palo.20053 2023-01-20T07:33:09Z Different proxies for sea surface temperature (SST) often exhibit divergent trends for deglacial warming in tropical regions, hampering our understanding of the phase relationship between tropical SSTs and continental ice volume at glacial terminations. To reconcile divergent SST trends, we report reconstructions of two commonly used paleothermometers (the foraminifera G. ruber Mg/Ca and the alkenone unsaturation index) from a marine sediment core collected in the southwestern tropical Indian Ocean encompassing the last 37,000 years. Our results show that SSTs derived from the alkenone unsaturation index (UK'37) are consistently warmer than those derived from Mg/Ca by ~2-3°C except for the Heinrich Event 1. In addition, the initial timing for the deglacial warming of alkenone SST started at ~15.6 ka, which lags behind that of Mg/Ca temperatures by 2.5 kyr. We argue that the discrepancy between the two SST proxies reflects seasonal differences between summer and winter rather than post-depositional processes or sedimentary biases. The UK'37 SST record clearly mimics the deglacial SST trend recorded in the North Atlantic region for the earlier part of the termination, indicating the early deglacial warming trend attributed to local summer temperatures was likely mediated by changes in the Atlantic Meridional Overturning Circulation at the onset of the deglaciation, In contrast, the glacial to interglacial SST pattern recorded by G. ruber Mg/Ca probably reflects cold season SSTs. This indicates that the cold season SSTs was likely mediated by climate changes in the southern hemisphere, as it closely tracks the Antarctic timing of deglaciation. Therefore our study reveals that the tropical southwestern Indian Ocean seasonal SST was closely linked to climate changes occurring in both hemispheres. The austral summer and winter recorded by each proxy is further supported with seasonal SST trends modeled by AOGCMs for our core site. Our interpretation that the alkenone and Mg/Ca SSTs are seasonally biased may also ... Dataset Antarc* Antarctic North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Antarctic The Antarctic Austral Indian ENVELOPE(37.868500,37.868500,-18.241200,-18.241200) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
GIK/IfG GIK16160-3 Gravity corer (Kiel type) Institute for Geosciences Christian Albrechts University Kiel M75/3 M75/3_137-3 Meteor (1986) Sambesi Fan SL |
spellingShingle |
GIK/IfG GIK16160-3 Gravity corer (Kiel type) Institute for Geosciences Christian Albrechts University Kiel M75/3 M75/3_137-3 Meteor (1986) Sambesi Fan SL Wang, Yiming V Leduc, Guillaume Regenberg, Marcus Andersen, Nils Larsen, Thomas Blanz, Thomas Schneider, Ralph R Paleotemperature reconstructions on sediment core GIK161603-3 |
topic_facet |
GIK/IfG GIK16160-3 Gravity corer (Kiel type) Institute for Geosciences Christian Albrechts University Kiel M75/3 M75/3_137-3 Meteor (1986) Sambesi Fan SL |
description |
Different proxies for sea surface temperature (SST) often exhibit divergent trends for deglacial warming in tropical regions, hampering our understanding of the phase relationship between tropical SSTs and continental ice volume at glacial terminations. To reconcile divergent SST trends, we report reconstructions of two commonly used paleothermometers (the foraminifera G. ruber Mg/Ca and the alkenone unsaturation index) from a marine sediment core collected in the southwestern tropical Indian Ocean encompassing the last 37,000 years. Our results show that SSTs derived from the alkenone unsaturation index (UK'37) are consistently warmer than those derived from Mg/Ca by ~2-3°C except for the Heinrich Event 1. In addition, the initial timing for the deglacial warming of alkenone SST started at ~15.6 ka, which lags behind that of Mg/Ca temperatures by 2.5 kyr. We argue that the discrepancy between the two SST proxies reflects seasonal differences between summer and winter rather than post-depositional processes or sedimentary biases. The UK'37 SST record clearly mimics the deglacial SST trend recorded in the North Atlantic region for the earlier part of the termination, indicating the early deglacial warming trend attributed to local summer temperatures was likely mediated by changes in the Atlantic Meridional Overturning Circulation at the onset of the deglaciation, In contrast, the glacial to interglacial SST pattern recorded by G. ruber Mg/Ca probably reflects cold season SSTs. This indicates that the cold season SSTs was likely mediated by climate changes in the southern hemisphere, as it closely tracks the Antarctic timing of deglaciation. Therefore our study reveals that the tropical southwestern Indian Ocean seasonal SST was closely linked to climate changes occurring in both hemispheres. The austral summer and winter recorded by each proxy is further supported with seasonal SST trends modeled by AOGCMs for our core site. Our interpretation that the alkenone and Mg/Ca SSTs are seasonally biased may also ... |
format |
Dataset |
author |
Wang, Yiming V Leduc, Guillaume Regenberg, Marcus Andersen, Nils Larsen, Thomas Blanz, Thomas Schneider, Ralph R |
author_facet |
Wang, Yiming V Leduc, Guillaume Regenberg, Marcus Andersen, Nils Larsen, Thomas Blanz, Thomas Schneider, Ralph R |
author_sort |
Wang, Yiming V |
title |
Paleotemperature reconstructions on sediment core GIK161603-3 |
title_short |
Paleotemperature reconstructions on sediment core GIK161603-3 |
title_full |
Paleotemperature reconstructions on sediment core GIK161603-3 |
title_fullStr |
Paleotemperature reconstructions on sediment core GIK161603-3 |
title_full_unstemmed |
Paleotemperature reconstructions on sediment core GIK161603-3 |
title_sort |
paleotemperature reconstructions on sediment core gik161603-3 |
publisher |
PANGAEA |
publishDate |
2013 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.820004 https://doi.org/10.1594/PANGAEA.820004 |
op_coverage |
LATITUDE: -18.241200 * LONGITUDE: 37.868500 * DATE/TIME START: 2008-03-15T09:21:00 * DATE/TIME END: 2008-03-15T09:21:00 |
long_lat |
ENVELOPE(37.868500,37.868500,-18.241200,-18.241200) |
geographic |
Antarctic The Antarctic Austral Indian |
geographic_facet |
Antarctic The Antarctic Austral Indian |
genre |
Antarc* Antarctic North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic |
op_source |
Supplement to: Wang, Yiming V; Leduc, Guillaume; Regenberg, Marcus; Andersen, Nils; Larsen, Thomas; Blanz, Thomas; Schneider, Ralph R (2013): Northern and southern hemisphere controls on seasonal sea surface temperatures in the Indian Ocean during the last deglaciation. Paleoceanography, 28(4), 619-632, https://doi.org/10.1002/palo.20053 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.820004 https://doi.org/10.1594/PANGAEA.820004 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.820004 https://doi.org/10.1002/palo.20053 |
_version_ |
1766164548573724672 |