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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2025
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| Online Access: | https://doi.org/10.1594/PANGAEA.980726 |
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| _version_ | 1867170480169943040 |
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| author | Yamamoto, Masanobu Bova, Samantha C Rosenthal, Yair Kikuchi, Sohei |
| author_facet | Yamamoto, Masanobu Bova, Samantha C Rosenthal, Yair Kikuchi, Sohei |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Enhanced Pacific meridional and zonal temperature gradients from ~2 to 1 million years ago (Ma) and the subsequent shift of glacial cycles in the Mid-Pleistocene Transition (MPT) from 1.2 to 0.7 Ma are remarkable in Pleistocene climate history. However, their influence on Indo-Pacific Warm Pool hydroclimate is unclear despite its global importance. Here we study the response of Papua New Guinea precipitation to changes in climate background conditions during these transitions using 1.68 million years of records of leaf wax deuterium and carbon isotopes, and pyrogenic polycyclic aromatic hydrocarbons from the Bismarck Sea. Dry climates dominate at peak interglacials through the ~1.7 My record, likely in response to higher CO2 and smaller continental ice sheets that shifted the tropical rain belt northward. Interglacial fire activity intensified at ~1.25 Ma, indicating an increased severity of droughts possibly due to intensification of El Niño events. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_980726 |
| institution | PANGAEA |
| language | en |
| publishDate | 2025 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | IODP Site 363-U1486 age model model and biomarker records during the past 1.68 million years Yamamoto, Masanobu Bova, Samantha C Rosenthal, Yair Kikuchi, Sohei Age model; Carbon isotopes; Fire activity; Hydroclimate; Hydrogen isotopes; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Long-chain n-fatty acids; n-alkanes; Pleistocene; Polycyclic arimatic hydrocarbons Enhanced Pacific meridional and zonal temperature gradients from ~2 to 1 million years ago (Ma) and the subsequent shift of glacial cycles in the Mid-Pleistocene Transition (MPT) from 1.2 to 0.7 Ma are remarkable in Pleistocene climate history. However, their influence on Indo-Pacific Warm Pool hydroclimate is unclear despite its global importance. Here we study the response of Papua New Guinea precipitation to changes in climate background conditions during these transitions using 1.68 million years of records of leaf wax deuterium and carbon isotopes, and pyrogenic polycyclic aromatic hydrocarbons from the Bismarck Sea. Dry climates dominate at peak interglacials through the ~1.7 My record, likely in response to higher CO2 and smaller continental ice sheets that shifted the tropical rain belt northward. Interglacial fire activity intensified at ~1.25 Ma, indicating an increased severity of droughts possibly due to intensification of El Niño events. |
| title | IODP Site 363-U1486 age model model and biomarker records during the past 1.68 million years |
| topic | Age model; Carbon isotopes; Fire activity; Hydroclimate; Hydrogen isotopes; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Long-chain n-fatty acids; n-alkanes; Pleistocene; Polycyclic arimatic hydrocarbons |
| url | https://doi.org/10.1594/PANGAEA.980726 |