Changes in intermediate water conditions in the northern South China Sea using Globorotalia inflata over the last 20 ka
ABSTRACT Intermediate circulation is one of the crucial controls of thermohaline changes in seawater. Due to the lack of data for some of the more significant indicators, there has been little research into past intermediate waters in the South China Sea (SCS). In particular, little is known of the...
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crwiley:10.1002/jqs.2974 2024-06-02T07:58:06+00:00 Changes in intermediate water conditions in the northern South China Sea using Globorotalia inflata over the last 20 ka Yang, Yiping Xiang, Rong Liu, Jianguo Fu, Shaoying Zhou, Liping Du, Shuhuan Lü, Honghong National Natural Science Foundation of China 2017 http://dx.doi.org/10.1002/jqs.2974 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.2974 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.2974 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 32, issue 7, page 1037-1048 ISSN 0267-8179 1099-1417 journal-article 2017 crwiley https://doi.org/10.1002/jqs.2974 2024-05-03T12:03:11Z ABSTRACT Intermediate circulation is one of the crucial controls of thermohaline changes in seawater. Due to the lack of data for some of the more significant indicators, there has been little research into past intermediate waters in the South China Sea (SCS). In particular, little is known of the thermohaline properties of intermediate water. Here, we present paired Mg/Ca and δ 18 O data for the planktonic foraminifera Globorotalia inflata from core GHE27L in the northern SCS; these data provide records of temperature and residual δ 18 O seawater (δ 18 O residual , being used as a proxy for salinity) to tentatively investigate changes in the intermediate water of the SCS over the last 20 ka. Our results show that G. inflata in the SCS grew principally within the 200–450 m water depth interval. Thermohaline changes recorded by G. inflata indicate warm and relatively freshening water during the Last Glacial Maximum (LGM, 20–17.7 ka BP ), changing to warm and saline waters between 17.7 and 13.6 ka BP . In general, waters during the 13.6–8.3 ka BP period were characterized by high temperatures and salinity, with obvious millennial‐scale fluctuations, after which, during the Holocene, they became cold and fresh. We suggest that the temperature and salinity of the intermediate water of the SCS recorded by G. inflata in core GHE27L were possibly associated with a switch in intermediate water masses. During the LGM, the intermediate water in the northern SCS was mainly impacted by North Pacific Intermediate Water (NPIW), but that subsequently the influence of Antarctic Intermediate Water strengthened during the last deglaciation and Pre‐Boreal period (17.7–8.3 ka BP ). After this period, NPIW was the principal control of the intermediate water of the SCS again. Article in Journal/Newspaper Antarc* Antarctic Planktonic foraminifera Wiley Online Library Antarctic Pacific Journal of Quaternary Science 32 7 1037 1048 |
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Wiley Online Library |
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English |
description |
ABSTRACT Intermediate circulation is one of the crucial controls of thermohaline changes in seawater. Due to the lack of data for some of the more significant indicators, there has been little research into past intermediate waters in the South China Sea (SCS). In particular, little is known of the thermohaline properties of intermediate water. Here, we present paired Mg/Ca and δ 18 O data for the planktonic foraminifera Globorotalia inflata from core GHE27L in the northern SCS; these data provide records of temperature and residual δ 18 O seawater (δ 18 O residual , being used as a proxy for salinity) to tentatively investigate changes in the intermediate water of the SCS over the last 20 ka. Our results show that G. inflata in the SCS grew principally within the 200–450 m water depth interval. Thermohaline changes recorded by G. inflata indicate warm and relatively freshening water during the Last Glacial Maximum (LGM, 20–17.7 ka BP ), changing to warm and saline waters between 17.7 and 13.6 ka BP . In general, waters during the 13.6–8.3 ka BP period were characterized by high temperatures and salinity, with obvious millennial‐scale fluctuations, after which, during the Holocene, they became cold and fresh. We suggest that the temperature and salinity of the intermediate water of the SCS recorded by G. inflata in core GHE27L were possibly associated with a switch in intermediate water masses. During the LGM, the intermediate water in the northern SCS was mainly impacted by North Pacific Intermediate Water (NPIW), but that subsequently the influence of Antarctic Intermediate Water strengthened during the last deglaciation and Pre‐Boreal period (17.7–8.3 ka BP ). After this period, NPIW was the principal control of the intermediate water of the SCS again. |
author2 |
National Natural Science Foundation of China |
format |
Article in Journal/Newspaper |
author |
Yang, Yiping Xiang, Rong Liu, Jianguo Fu, Shaoying Zhou, Liping Du, Shuhuan Lü, Honghong |
spellingShingle |
Yang, Yiping Xiang, Rong Liu, Jianguo Fu, Shaoying Zhou, Liping Du, Shuhuan Lü, Honghong Changes in intermediate water conditions in the northern South China Sea using Globorotalia inflata over the last 20 ka |
author_facet |
Yang, Yiping Xiang, Rong Liu, Jianguo Fu, Shaoying Zhou, Liping Du, Shuhuan Lü, Honghong |
author_sort |
Yang, Yiping |
title |
Changes in intermediate water conditions in the northern South China Sea using Globorotalia inflata over the last 20 ka |
title_short |
Changes in intermediate water conditions in the northern South China Sea using Globorotalia inflata over the last 20 ka |
title_full |
Changes in intermediate water conditions in the northern South China Sea using Globorotalia inflata over the last 20 ka |
title_fullStr |
Changes in intermediate water conditions in the northern South China Sea using Globorotalia inflata over the last 20 ka |
title_full_unstemmed |
Changes in intermediate water conditions in the northern South China Sea using Globorotalia inflata over the last 20 ka |
title_sort |
changes in intermediate water conditions in the northern south china sea using globorotalia inflata over the last 20 ka |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1002/jqs.2974 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.2974 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.2974 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic Planktonic foraminifera |
genre_facet |
Antarc* Antarctic Planktonic foraminifera |
op_source |
Journal of Quaternary Science volume 32, issue 7, page 1037-1048 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.2974 |
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Journal of Quaternary Science |
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32 |
container_issue |
7 |
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1037 |
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1048 |
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1800741369910657024 |