Natural gamma ray downhole logging-based elemental data IODP Sites U1459 and U1464, W-Australia, Miocene
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2018
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| _version_ | 1867167676313370624 |
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| author | Groeneveld, Jeroen Henderiks, Jorijntje Renema, Willem McHugh, Cecilia M G De Vleeschouwer, David Christensen, Beth A Fulthorpe, Craig S Reuning, Lars Gallagher, Stephen John Bogus, Kara A Auer, Gerald Ishiwa, Takeshige Expedition 356 Scientists |
| author_facet | Groeneveld, Jeroen Henderiks, Jorijntje Renema, Willem McHugh, Cecilia M G De Vleeschouwer, David Christensen, Beth A Fulthorpe, Craig S Reuning, Lars Gallagher, Stephen John Bogus, Kara A Auer, Gerald Ishiwa, Takeshige Expedition 356 Scientists |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Global climate underwent a major reorganization when the Antarctic ice sheet expanded ~14 million years ago (Ma) (1). This event affected global atmospheric circulation, including the strength and position of the westerlies and the Intertropical Convergence Zone (ITCZ), and, therefore, precipitation patterns (2-5). We present new shallow-marine sediment records from the continental shelf of Australia (International Ocean Discovery Program Sites U1459 and U1464) providing the first empirical evidence linking high-latitude cooling around Antarctica to climate change in the (sub)tropics during the Miocene. We show that Western Australia was arid during most of the Middle Miocene. Southwest Australia became wetter during the Late Miocene, creating a climate gradient with the arid interior, whereas northwest Australia remained arid throughout. Precipitation and river runoff in southwest Australia gradually increased from 12 to 8 Ma, which we relate to a northward migration or intensification of the westerlies possibly due to increased sea ice in the Southern Ocean (5). Abrupt aridification indicates that the westerlies shifted back to a position south of Australia after 8 Ma. Our midlatitude Southern Hemisphere data are consistent with the inference that expansion of sea ice around Antarctica resulted in a northward movement of the westerlies. In turn, this may have pushed tropical atmospheric circulation and the ITCZ northward, shifting the main precipitation belt over large parts of Southeast Asia (4). |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_893169 |
| institution | PANGAEA |
| language | en |
| publishDate | 2018 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Natural gamma ray downhole logging-based elemental data IODP Sites U1459 and U1464, W-Australia, Miocene Groeneveld, Jeroen Henderiks, Jorijntje Renema, Willem McHugh, Cecilia M G De Vleeschouwer, David Christensen, Beth A Fulthorpe, Craig S Reuning, Lars Gallagher, Stephen John Bogus, Kara A Auer, Gerald Ishiwa, Takeshige Expedition 356 Scientists Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP Global climate underwent a major reorganization when the Antarctic ice sheet expanded ~14 million years ago (Ma) (1). This event affected global atmospheric circulation, including the strength and position of the westerlies and the Intertropical Convergence Zone (ITCZ), and, therefore, precipitation patterns (2-5). We present new shallow-marine sediment records from the continental shelf of Australia (International Ocean Discovery Program Sites U1459 and U1464) providing the first empirical evidence linking high-latitude cooling around Antarctica to climate change in the (sub)tropics during the Miocene. We show that Western Australia was arid during most of the Middle Miocene. Southwest Australia became wetter during the Late Miocene, creating a climate gradient with the arid interior, whereas northwest Australia remained arid throughout. Precipitation and river runoff in southwest Australia gradually increased from 12 to 8 Ma, which we relate to a northward migration or intensification of the westerlies possibly due to increased sea ice in the Southern Ocean (5). Abrupt aridification indicates that the westerlies shifted back to a position south of Australia after 8 Ma. Our midlatitude Southern Hemisphere data are consistent with the inference that expansion of sea ice around Antarctica resulted in a northward movement of the westerlies. In turn, this may have pushed tropical atmospheric circulation and the ITCZ northward, shifting the main precipitation belt over large parts of Southeast Asia (4). |
| title | Natural gamma ray downhole logging-based elemental data IODP Sites U1459 and U1464, W-Australia, Miocene |
| topic | Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP |
| url | https://doi.org/10.1594/PANGAEA.893169 |