Quantitative silicoflagellate data from the southern Indic Ocean from ODP Holes 188-1165B, 120-748B and 120-751A
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2003
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| _version_ | 1867169501017014272 |
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| author | Whitehead, Jason M Bohaty, Steven M |
| author_facet | Whitehead, Jason M Bohaty, Steven M |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | In the modern marine environment the silicoflagellate genus Dictyocha is rare, or absent, south of the Antarctic polar front (APF); the genus Distephanus, in contrast, is dominant. In sediments recovered from ODP Site 1165, 1600 km south of the front, however, three intervals where Dictyocha is abundant are interpreted to represent Pliocene warm events. Comparison of our data with Ciesielski and Weaver's [1974] modern core top silicoflagellate relationship with sea surface temperature (SST) indicates that at Site 1165 mean annual SST was approximately 5°C at 3.7 Ma (event I), and approximately 4°C at 4.3-4.4 Ma (event II) and 4.55-4.8 Ma (event III). Event I represents a 5.5°C warming, and events II and III represents a 4.5°C warming relative to modern mean annual SST. Dictyocha is absent from other Site 1165 Pliocene intervals, which suggests that cooler SST (<2°C) prevailed. The warm events detected at Site 1165 may represent times when North Atlantic Deep Water production and ocean heat transport into the Southern Ocean exerted maximum influence. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_738669 |
| institution | PANGAEA |
| language | en |
| publishDate | 2003 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Quantitative silicoflagellate data from the southern Indic Ocean from ODP Holes 188-1165B, 120-748B and 120-751A Whitehead, Jason M Bohaty, Steven M 120-748B; 120-751A; 188-1165B; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Leg120; Leg188; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean In the modern marine environment the silicoflagellate genus Dictyocha is rare, or absent, south of the Antarctic polar front (APF); the genus Distephanus, in contrast, is dominant. In sediments recovered from ODP Site 1165, 1600 km south of the front, however, three intervals where Dictyocha is abundant are interpreted to represent Pliocene warm events. Comparison of our data with Ciesielski and Weaver's [1974] modern core top silicoflagellate relationship with sea surface temperature (SST) indicates that at Site 1165 mean annual SST was approximately 5°C at 3.7 Ma (event I), and approximately 4°C at 4.3-4.4 Ma (event II) and 4.55-4.8 Ma (event III). Event I represents a 5.5°C warming, and events II and III represents a 4.5°C warming relative to modern mean annual SST. Dictyocha is absent from other Site 1165 Pliocene intervals, which suggests that cooler SST (<2°C) prevailed. The warm events detected at Site 1165 may represent times when North Atlantic Deep Water production and ocean heat transport into the Southern Ocean exerted maximum influence. |
| title | Quantitative silicoflagellate data from the southern Indic Ocean from ODP Holes 188-1165B, 120-748B and 120-751A |
| topic | 120-748B; 120-751A; 188-1165B; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Leg120; Leg188; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean |
| url | https://doi.org/10.1594/PANGAEA.738669 |