Thermocline dynamics in the northwestern tropical Pacific over the past 700 kyr
Variations in thermoclinal conditions play an important role in the evolution of the Western Pacific Warm Pool (WPWP) and in connecting the tropical and extratropical regions of the Pacific Ocean. However, secular thermoclinal changes in the northwestern part of the WPWP and their forcing mechanisms...
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ftchinacasciocas:oai:ir.qdio.ac.cn:337002/168738 2023-05-15T16:41:15+02:00 Thermocline dynamics in the northwestern tropical Pacific over the past 700 kyr Jia, Qi Li, Tiegang Xiong, Zhifang Steinke, Stephan Algeo, Thomas J. Jiang, Fuqing Chang, Fengming Qin, Bingbin 2020-09-15 http://ir.qdio.ac.cn/handle/337002/168737 http://ir.qdio.ac.cn/handle/337002/168738 https://doi.org/10.1016/j.quascirev.2020.106465 英语 eng PERGAMON-ELSEVIER SCIENCE LTD QUATERNARY SCIENCE REVIEWS http://ir.qdio.ac.cn/handle/337002/168737 http://ir.qdio.ac.cn/handle/337002/168738 doi:10.1016/j.quascirev.2020.106465 Western philippine sea Western pacific warm pool WPWP delta O-18 Obliquity Thermocline depth Physical Geography Geology Geography Physical Geosciences Multidisciplinary 期刊论文 2020 ftchinacasciocas https://doi.org/10.1016/j.quascirev.2020.106465 2022-06-27T05:43:10Z Variations in thermoclinal conditions play an important role in the evolution of the Western Pacific Warm Pool (WPWP) and in connecting the tropical and extratropical regions of the Pacific Ocean. However, secular thermoclinal changes in the northwestern part of the WPWP and their forcing mechanisms are not yet well understood, particularly on orbital timescales. In this study, we report thermoclinal variation at Site MD06-3047 B in the western Philippine Sea over the last 700 kyr. Our data show that variations in thermocline temperature and salinity in the study area were correlated with changes in Earth's obliquity, with warmer and saltier (colder and fresher) thermocline waters corresponding to high (low) Earth-axial obliquity. At high obliquity, increases in thermocline temperature and salinity may have been linked to advection of warm North Pacific tropical water. In the study area, a lower (higher) vertical temperature gradient in the upper water column suggests a deeper (shallower) thermocline during glacials (interglacials). The main factor leading to thermoclinal deepening during glacials was strengthening of the East Asian winter monsoon (EAWM), and more La Nina-like conditions may have contributed to concurrent subsurface warming and thus thermoclinal deepening. In-phase thermoclinal deepening in the northern and peri-equatorial southern WPWP during glacial stages may have been triggered by changes in glacial boundary conditions, such as increased ice sheet thickness, through intensification of the EAWM and strengthening of the tropical Trade Winds. (C) 2020 Elsevier Ltd. All rights reserved. Report Ice Sheet Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR Pacific Quaternary Science Reviews 244 106465 |
institution |
Open Polar |
collection |
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR |
op_collection_id |
ftchinacasciocas |
language |
English |
topic |
Western philippine sea Western pacific warm pool WPWP delta O-18 Obliquity Thermocline depth Physical Geography Geology Geography Physical Geosciences Multidisciplinary |
spellingShingle |
Western philippine sea Western pacific warm pool WPWP delta O-18 Obliquity Thermocline depth Physical Geography Geology Geography Physical Geosciences Multidisciplinary Jia, Qi Li, Tiegang Xiong, Zhifang Steinke, Stephan Algeo, Thomas J. Jiang, Fuqing Chang, Fengming Qin, Bingbin Thermocline dynamics in the northwestern tropical Pacific over the past 700 kyr |
topic_facet |
Western philippine sea Western pacific warm pool WPWP delta O-18 Obliquity Thermocline depth Physical Geography Geology Geography Physical Geosciences Multidisciplinary |
description |
Variations in thermoclinal conditions play an important role in the evolution of the Western Pacific Warm Pool (WPWP) and in connecting the tropical and extratropical regions of the Pacific Ocean. However, secular thermoclinal changes in the northwestern part of the WPWP and their forcing mechanisms are not yet well understood, particularly on orbital timescales. In this study, we report thermoclinal variation at Site MD06-3047 B in the western Philippine Sea over the last 700 kyr. Our data show that variations in thermocline temperature and salinity in the study area were correlated with changes in Earth's obliquity, with warmer and saltier (colder and fresher) thermocline waters corresponding to high (low) Earth-axial obliquity. At high obliquity, increases in thermocline temperature and salinity may have been linked to advection of warm North Pacific tropical water. In the study area, a lower (higher) vertical temperature gradient in the upper water column suggests a deeper (shallower) thermocline during glacials (interglacials). The main factor leading to thermoclinal deepening during glacials was strengthening of the East Asian winter monsoon (EAWM), and more La Nina-like conditions may have contributed to concurrent subsurface warming and thus thermoclinal deepening. In-phase thermoclinal deepening in the northern and peri-equatorial southern WPWP during glacial stages may have been triggered by changes in glacial boundary conditions, such as increased ice sheet thickness, through intensification of the EAWM and strengthening of the tropical Trade Winds. (C) 2020 Elsevier Ltd. All rights reserved. |
format |
Report |
author |
Jia, Qi Li, Tiegang Xiong, Zhifang Steinke, Stephan Algeo, Thomas J. Jiang, Fuqing Chang, Fengming Qin, Bingbin |
author_facet |
Jia, Qi Li, Tiegang Xiong, Zhifang Steinke, Stephan Algeo, Thomas J. Jiang, Fuqing Chang, Fengming Qin, Bingbin |
author_sort |
Jia, Qi |
title |
Thermocline dynamics in the northwestern tropical Pacific over the past 700 kyr |
title_short |
Thermocline dynamics in the northwestern tropical Pacific over the past 700 kyr |
title_full |
Thermocline dynamics in the northwestern tropical Pacific over the past 700 kyr |
title_fullStr |
Thermocline dynamics in the northwestern tropical Pacific over the past 700 kyr |
title_full_unstemmed |
Thermocline dynamics in the northwestern tropical Pacific over the past 700 kyr |
title_sort |
thermocline dynamics in the northwestern tropical pacific over the past 700 kyr |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2020 |
url |
http://ir.qdio.ac.cn/handle/337002/168737 http://ir.qdio.ac.cn/handle/337002/168738 https://doi.org/10.1016/j.quascirev.2020.106465 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
QUATERNARY SCIENCE REVIEWS http://ir.qdio.ac.cn/handle/337002/168737 http://ir.qdio.ac.cn/handle/337002/168738 doi:10.1016/j.quascirev.2020.106465 |
op_doi |
https://doi.org/10.1016/j.quascirev.2020.106465 |
container_title |
Quaternary Science Reviews |
container_volume |
244 |
container_start_page |
106465 |
_version_ |
1766031686830653440 |