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| Main Authors: | , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2004
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| Online Access: | https://doi.org/10.1594/PANGAEA.772059 |
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| _version_ | 1867170461119414272 |
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| author | Shevenell, Amelia E Kennett, James P Lea, David W |
| author_facet | Shevenell, Amelia E Kennett, James P Lea, David W |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Magnesium/calcium data from Southern Ocean planktonic foraminifera demonstrate that high-latitude (~55°S) southwest Pacific sea surface temperatures (SSTs) cooled 6° to 7°C during the middle Miocene climate transition (14.2 to 13.8 million years ago). Stepwise surface cooling is paced by eccentricity forcing and precedes Antarctic cryosphere expansion by ~60 thousand years, suggesting the involvement of additional feedbacks during this interval of inferred low-atmospheric partial pressure of CO2 (pCO2). Comparing SSTs and global carbon cycling proxies challenges the notion that episodic pCO2 drawdown drove this major Cenozoic climate transition. SST, salinity, and ice-volume trends suggest instead that orbitally paced ocean circulation changes altered meridional heat/vapor transport, triggering ice growth and global cooling. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_772059 |
| institution | PANGAEA |
| language | en |
| publishDate | 2004 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Sea surface temperature reconstruction for the middle Miocene Southern Ocean Shevenell, Amelia E Kennett, James P Lea, David W 189-1170A; 189-1171C; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Leg189; Ocean Drilling Program; ODP; South Pacific Ocean Magnesium/calcium data from Southern Ocean planktonic foraminifera demonstrate that high-latitude (~55°S) southwest Pacific sea surface temperatures (SSTs) cooled 6° to 7°C during the middle Miocene climate transition (14.2 to 13.8 million years ago). Stepwise surface cooling is paced by eccentricity forcing and precedes Antarctic cryosphere expansion by ~60 thousand years, suggesting the involvement of additional feedbacks during this interval of inferred low-atmospheric partial pressure of CO2 (pCO2). Comparing SSTs and global carbon cycling proxies challenges the notion that episodic pCO2 drawdown drove this major Cenozoic climate transition. SST, salinity, and ice-volume trends suggest instead that orbitally paced ocean circulation changes altered meridional heat/vapor transport, triggering ice growth and global cooling. |
| title | Sea surface temperature reconstruction for the middle Miocene Southern Ocean |
| topic | 189-1170A; 189-1171C; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Leg189; Ocean Drilling Program; ODP; South Pacific Ocean |
| url | https://doi.org/10.1594/PANGAEA.772059 |