Isotope and Mg/Ca results from ODP Site 184-1145
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2005
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| _version_ | 1867171357384507392 |
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| author | Oppo, Delia W Sun, Youbin |
| author_facet | Oppo, Delia W Sun, Youbin |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Magnesium/calcium (Mg/Ca) ratios of foraminiferal shells from a sediment core from the northern South China Sea, a semi-enclosed basin in the western tropical Pacific, document variations in sea-surface temperature (SST) during the past 145 k.y. Glacial SSTs were 4°C colder than interglacial SSTs. During the last deglaciation, most of the warming was accomplished in a single abrupt step after continental ice-sheet decay had already begun, but warming and ice-sheet demise were nearly synchronous during the penultimate deglaciation. Abrupt SST changes of the past 15 k.y. were apparently synchronous with events in East Asian monsoon rainfall, suggesting that variations in monsoon winds and their influence on surface circulation of the western Pacific exerted a strong control on northern South China Sea SSTs. We suggest that this link persisted for the previous 130 k.y., during which time orbital-scale 2-3°C SST changes and several small (</=2°C) abrupt SST events occurred in the northern South China Sea. The similar timing of northern South China Sea SST, on a benthic d18O time scale, to a well-dated speleothem record from eastern China suggests that the demise of ice sheets associated with the penultimate deglaciation did not precede Northern Hemisphere summer insolation increase. Our results suggest that surface waters had higher d18O values during times of strong summer monsoon than during times of weak monsoon, likely reflecting a redistribution of 18O-depleted rainfall from land during times of strong summer monsoons, to the western Pacific during times of weaker summer monsoons. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_713701 |
| institution | PANGAEA |
| language | en |
| publishDate | 2005 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Isotope and Mg/Ca results from ODP Site 184-1145 Oppo, Delia W Sun, Youbin 184-1145A; 184-1145B; 184-1145C; DRILL; Drilling/drill rig; Joides Resolution; Leg184; Ocean Drilling Program; ODP; South China Sea Magnesium/calcium (Mg/Ca) ratios of foraminiferal shells from a sediment core from the northern South China Sea, a semi-enclosed basin in the western tropical Pacific, document variations in sea-surface temperature (SST) during the past 145 k.y. Glacial SSTs were 4°C colder than interglacial SSTs. During the last deglaciation, most of the warming was accomplished in a single abrupt step after continental ice-sheet decay had already begun, but warming and ice-sheet demise were nearly synchronous during the penultimate deglaciation. Abrupt SST changes of the past 15 k.y. were apparently synchronous with events in East Asian monsoon rainfall, suggesting that variations in monsoon winds and their influence on surface circulation of the western Pacific exerted a strong control on northern South China Sea SSTs. We suggest that this link persisted for the previous 130 k.y., during which time orbital-scale 2-3°C SST changes and several small (</=2°C) abrupt SST events occurred in the northern South China Sea. The similar timing of northern South China Sea SST, on a benthic d18O time scale, to a well-dated speleothem record from eastern China suggests that the demise of ice sheets associated with the penultimate deglaciation did not precede Northern Hemisphere summer insolation increase. Our results suggest that surface waters had higher d18O values during times of strong summer monsoon than during times of weak monsoon, likely reflecting a redistribution of 18O-depleted rainfall from land during times of strong summer monsoons, to the western Pacific during times of weaker summer monsoons. |
| title | Isotope and Mg/Ca results from ODP Site 184-1145 |
| topic | 184-1145A; 184-1145B; 184-1145C; DRILL; Drilling/drill rig; Joides Resolution; Leg184; Ocean Drilling Program; ODP; South China Sea |
| url | https://doi.org/10.1594/PANGAEA.713701 |