Enhanced upwelling in the eastern equatorial Pacific at the last five glacial terminations
TEX86H- and UK37′-derived paleotemperatures, and isoprenoid glycerol dialkyl glycerol tetraether (GDGT), and alkenone concentrations were examined for ODP Site 1239 in the eastern equatorial Pacific (EEP) for the last 430 kyr. We propose that the difference between TEX86H- and UK37′-derived temperat...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Language: | English |
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Online Access: | http://hdl.handle.net/2115/53618 https://doi.org/10.1016/j.palaeo.2013.03.022 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/53618 2023-05-15T18:24:53+02:00 Enhanced upwelling in the eastern equatorial Pacific at the last five glacial terminations bin Shaari, Hasrizal Yamamoto, Masanobu Irino, Tomohisa http://hdl.handle.net/2115/53618 https://doi.org/10.1016/j.palaeo.2013.03.022 eng eng Elsevier Science B.V. http://www.sciencedirect.com/science/article/pii/S0031018213001600# http://hdl.handle.net/2115/53618 Palaeogeography palaeoclimatology palaeoecology, 386: 8-15 http://dx.doi.org/10.1016/j.palaeo.2013.03.022 Copyright © 2013 Elsevier B.V. All rights reserved. TEX86 UK37 ' Eastern equatorial Pacific Upwelling Deglaciation 450 article (author version) fthokunivhus https://doi.org/10.1016/j.palaeo.2013.03.022 2022-11-18T01:02:57Z TEX86H- and UK37′-derived paleotemperatures, and isoprenoid glycerol dialkyl glycerol tetraether (GDGT), and alkenone concentrations were examined for ODP Site 1239 in the eastern equatorial Pacific (EEP) for the last 430 kyr. We propose that the difference between TEX86H- and UK37′-derived temperatures (∆T) and the abundance ratio of GDGTs to alkenones (GDGT/alkenone ratio) are potential upwelling indices which show consistent results with other upwelling indices. The ∆T and GDGT/alkenone ratio were maximal during the last five deglaciations, suggesting intensified upwelling. The intensification of upwelling in the EEP coincided with those at the Peru margin and in the Southern Ocean. This coincidence suggests that the reorganization of the Southern Hemisphere atmospheric circulation induced the intensification of the subtropical high-pressure cell, causing stronger southeast trade winds along the west coast of South America and the southern westerlies over the Southern Ocean, enhancing upwelling in both regions. Article in Journal/Newspaper Southern Ocean Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Pacific Southern Ocean Palaeogeography, Palaeoclimatology, Palaeoecology 386 8 15 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
TEX86 UK37 ' Eastern equatorial Pacific Upwelling Deglaciation 450 |
spellingShingle |
TEX86 UK37 ' Eastern equatorial Pacific Upwelling Deglaciation 450 bin Shaari, Hasrizal Yamamoto, Masanobu Irino, Tomohisa Enhanced upwelling in the eastern equatorial Pacific at the last five glacial terminations |
topic_facet |
TEX86 UK37 ' Eastern equatorial Pacific Upwelling Deglaciation 450 |
description |
TEX86H- and UK37′-derived paleotemperatures, and isoprenoid glycerol dialkyl glycerol tetraether (GDGT), and alkenone concentrations were examined for ODP Site 1239 in the eastern equatorial Pacific (EEP) for the last 430 kyr. We propose that the difference between TEX86H- and UK37′-derived temperatures (∆T) and the abundance ratio of GDGTs to alkenones (GDGT/alkenone ratio) are potential upwelling indices which show consistent results with other upwelling indices. The ∆T and GDGT/alkenone ratio were maximal during the last five deglaciations, suggesting intensified upwelling. The intensification of upwelling in the EEP coincided with those at the Peru margin and in the Southern Ocean. This coincidence suggests that the reorganization of the Southern Hemisphere atmospheric circulation induced the intensification of the subtropical high-pressure cell, causing stronger southeast trade winds along the west coast of South America and the southern westerlies over the Southern Ocean, enhancing upwelling in both regions. |
format |
Article in Journal/Newspaper |
author |
bin Shaari, Hasrizal Yamamoto, Masanobu Irino, Tomohisa |
author_facet |
bin Shaari, Hasrizal Yamamoto, Masanobu Irino, Tomohisa |
author_sort |
bin Shaari, Hasrizal |
title |
Enhanced upwelling in the eastern equatorial Pacific at the last five glacial terminations |
title_short |
Enhanced upwelling in the eastern equatorial Pacific at the last five glacial terminations |
title_full |
Enhanced upwelling in the eastern equatorial Pacific at the last five glacial terminations |
title_fullStr |
Enhanced upwelling in the eastern equatorial Pacific at the last five glacial terminations |
title_full_unstemmed |
Enhanced upwelling in the eastern equatorial Pacific at the last five glacial terminations |
title_sort |
enhanced upwelling in the eastern equatorial pacific at the last five glacial terminations |
publisher |
Elsevier Science B.V. |
url |
http://hdl.handle.net/2115/53618 https://doi.org/10.1016/j.palaeo.2013.03.022 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
http://www.sciencedirect.com/science/article/pii/S0031018213001600# http://hdl.handle.net/2115/53618 Palaeogeography palaeoclimatology palaeoecology, 386: 8-15 http://dx.doi.org/10.1016/j.palaeo.2013.03.022 |
op_rights |
Copyright © 2013 Elsevier B.V. All rights reserved. |
op_doi |
https://doi.org/10.1016/j.palaeo.2013.03.022 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
386 |
container_start_page |
8 |
op_container_end_page |
15 |
_version_ |
1766205897763192832 |