Radiocarbon age, Mg/Ca and δ¹⁸O measurements on planktonic foraminifera of sediment core GeoB12605-3
The sea surface temperature (SST) of the tropical Indian Ocean is a major component of global climate teleconnections. While the Holocene SST history is documented for regions affected by the Indian and Arabian monsoons, data from the near-equatorial western Indian Ocean are sparse. Reconstructing p...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.833022 2023-05-15T18:01:02+02:00 Radiocarbon age, Mg/Ca and δ¹⁸O measurements on planktonic foraminifera of sediment core GeoB12605-3 Kuhnert, Henning Kuhlmann, Holger Mohtadi, Mahyar Meggers, Helge Baumann, Karl-Heinz Pätzold, Jürgen LATITUDE: -5.573167 * LONGITUDE: 39.108167 * DATE/TIME START: 2008-02-10T20:12:00 * DATE/TIME END: 2008-02-10T20:12:00 2014-05-27 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.833022 https://doi.org/10.1594/PANGAEA.833022 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.833022 https://doi.org/10.1594/PANGAEA.833022 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Kuhnert, Henning; Kuhlmann, Holger; Mohtadi, Mahyar; Meggers, Helge; Baumann, Karl-Heinz; Pätzold, Jürgen (2014): Holocene tropical western Indian Ocean sea surface temperatures in covariation with climatic changes in the Indonesian region. Paleoceanography, https://doi.org/10.1002/2013PA002555 Center for Marine Environmental Sciences MARUM Dataset 2014 ftpangaea https://doi.org/10.1594/PANGAEA.833022 https://doi.org/10.1002/2013PA002555 2023-01-20T07:33:17Z The sea surface temperature (SST) of the tropical Indian Ocean is a major component of global climate teleconnections. While the Holocene SST history is documented for regions affected by the Indian and Arabian monsoons, data from the near-equatorial western Indian Ocean are sparse. Reconstructing past zonal and meridional SST gradients requires additional information on past temperatures from the western boundary current region. We present a unique record of Holocene SST and thermocline depth variations in the tropical western Indian Ocean as documented in foraminiferal Mg/Ca ratios and d18O from a sediment core off northern Tanzania. For Mg/Ca and thermocline d18O, most variance is concentrated in the centennial to bicentennial periodicity band. On the millennial time scale, an early to mid-Holocene (~7.8-5.6 ka) warm phase is followed by a temperature drop by up to 2°C, leading to a mid-Holocene cool interval (5.6-4.2 ka). The shift is accompanied by an initial reduction in the difference between surface and thermocline foraminiferal d18O, consistent with the thickening of the mixed layer and suggestions of a strengthened Walker circulation. However, we cannot confirm the expected enhanced zonal SST gradient, as the cooling of similar magnitude had previously been found in SSTs from the upwelling region off Sumatra and in Flores air temperatures. The SST pattern probably reflects the tropical Indian Ocean expression of a large-scale climate anomaly rather than a positive Indian Ocean Dipole-like mean state. Dataset Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science Indian ENVELOPE(39.108167,39.108167,-5.573167,-5.573167) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Center for Marine Environmental Sciences MARUM |
spellingShingle |
Center for Marine Environmental Sciences MARUM Kuhnert, Henning Kuhlmann, Holger Mohtadi, Mahyar Meggers, Helge Baumann, Karl-Heinz Pätzold, Jürgen Radiocarbon age, Mg/Ca and δ¹⁸O measurements on planktonic foraminifera of sediment core GeoB12605-3 |
topic_facet |
Center for Marine Environmental Sciences MARUM |
description |
The sea surface temperature (SST) of the tropical Indian Ocean is a major component of global climate teleconnections. While the Holocene SST history is documented for regions affected by the Indian and Arabian monsoons, data from the near-equatorial western Indian Ocean are sparse. Reconstructing past zonal and meridional SST gradients requires additional information on past temperatures from the western boundary current region. We present a unique record of Holocene SST and thermocline depth variations in the tropical western Indian Ocean as documented in foraminiferal Mg/Ca ratios and d18O from a sediment core off northern Tanzania. For Mg/Ca and thermocline d18O, most variance is concentrated in the centennial to bicentennial periodicity band. On the millennial time scale, an early to mid-Holocene (~7.8-5.6 ka) warm phase is followed by a temperature drop by up to 2°C, leading to a mid-Holocene cool interval (5.6-4.2 ka). The shift is accompanied by an initial reduction in the difference between surface and thermocline foraminiferal d18O, consistent with the thickening of the mixed layer and suggestions of a strengthened Walker circulation. However, we cannot confirm the expected enhanced zonal SST gradient, as the cooling of similar magnitude had previously been found in SSTs from the upwelling region off Sumatra and in Flores air temperatures. The SST pattern probably reflects the tropical Indian Ocean expression of a large-scale climate anomaly rather than a positive Indian Ocean Dipole-like mean state. |
format |
Dataset |
author |
Kuhnert, Henning Kuhlmann, Holger Mohtadi, Mahyar Meggers, Helge Baumann, Karl-Heinz Pätzold, Jürgen |
author_facet |
Kuhnert, Henning Kuhlmann, Holger Mohtadi, Mahyar Meggers, Helge Baumann, Karl-Heinz Pätzold, Jürgen |
author_sort |
Kuhnert, Henning |
title |
Radiocarbon age, Mg/Ca and δ¹⁸O measurements on planktonic foraminifera of sediment core GeoB12605-3 |
title_short |
Radiocarbon age, Mg/Ca and δ¹⁸O measurements on planktonic foraminifera of sediment core GeoB12605-3 |
title_full |
Radiocarbon age, Mg/Ca and δ¹⁸O measurements on planktonic foraminifera of sediment core GeoB12605-3 |
title_fullStr |
Radiocarbon age, Mg/Ca and δ¹⁸O measurements on planktonic foraminifera of sediment core GeoB12605-3 |
title_full_unstemmed |
Radiocarbon age, Mg/Ca and δ¹⁸O measurements on planktonic foraminifera of sediment core GeoB12605-3 |
title_sort |
radiocarbon age, mg/ca and δ¹⁸o measurements on planktonic foraminifera of sediment core geob12605-3 |
publisher |
PANGAEA |
publishDate |
2014 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.833022 https://doi.org/10.1594/PANGAEA.833022 |
op_coverage |
LATITUDE: -5.573167 * LONGITUDE: 39.108167 * DATE/TIME START: 2008-02-10T20:12:00 * DATE/TIME END: 2008-02-10T20:12:00 |
long_lat |
ENVELOPE(39.108167,39.108167,-5.573167,-5.573167) |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Supplement to: Kuhnert, Henning; Kuhlmann, Holger; Mohtadi, Mahyar; Meggers, Helge; Baumann, Karl-Heinz; Pätzold, Jürgen (2014): Holocene tropical western Indian Ocean sea surface temperatures in covariation with climatic changes in the Indonesian region. Paleoceanography, https://doi.org/10.1002/2013PA002555 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.833022 https://doi.org/10.1594/PANGAEA.833022 |
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.833022 https://doi.org/10.1002/2013PA002555 |
_version_ |
1766170358575005696 |