{"id":194,"date":"2023-06-05T10:56:25","date_gmt":"2023-06-05T17:56:25","guid":{"rendered":"https:\/\/dornsife.usc.edu\/feakins\/?page_id=194"},"modified":"2023-09-25T12:01:00","modified_gmt":"2023-09-25T19:01:00","slug":"warm-periods-in-deep-time","status":"publish","type":"page","link":"https:\/\/dornsife.usc.edu\/feakins\/warm-periods-in-deep-time\/","title":{"rendered":"Warm Periods in Deep Time"},"content":{"rendered":" \n \n\n\n\n\n\n\n\n
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Past periods of global warmth can provide extraordinary insights into climate and life on the planet, beyond the range of recent experience. I am particularly interested in the operation of the climate system during warm periods that represent \u201cmodest greenhouse\u201d conditions (late Eocene, mid Miocene, early-mid Pliocene, interglacials). Such climates provide a context for our current and future climate. Work has been downstream of two key regions for the global climate system: at the margins of the presently ice-covered Antarctic continent, and the monsoon-dominated Indian Ocean region.<\/p>\n\n\n\n<\/div>\n \n\n <\/div><\/div>\n\n\n\n\n \n \n\n\n\n\n\n\n\n

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Antarctica \u2013 see Beyond Ice website<\/strong><\/a><\/p>\n

Indian Ocean margins<\/strong><\/h3>\n

Recent work on warm periods has focused on\u00a0tropical locations around the Indian Ocean<\/strong>\u00a0including biomarker records of climate and vegetation from Pliocene age sediments from Gulf of Aden (see\u00a0human origins<\/a>\u00a0section), and with ongoing laboratory work on drill cores recovered from recent IODP\u00a0Expedition 354 to the Bengal Fan\u00a0<\/a>and\u00a0IODP Expedition 355 to the Indus Fan<\/a>\u00a0we are now reconstructing the long history of the Indian Monsoon.<\/p>\n

Lee, H.*, Galy, V., Feng, X., Ponton, C.*, Galy, A., France-Lanord, C.,\u00a0Feakins, S.J.\u00a0<\/strong>Sustained wood burial in the Bengal Fan across 19My, doi: 10.1073\/pnas.1913714116.\u00a0article<\/a>\u00a0\u00a0data\u00a0<\/a>see also\u00a0press<\/a>\u00a0page<\/p>\n

Tauxe, L. and\u00a0Feakins S.J.<\/strong>, A re-assessment of the chronostratigraphy of late Miocene C3<\/sub>-C4<\/sub>\u00a0transitions,\u00a0Paleoceanography and Paleoclimatology,\u00a0<\/em>https:\/\/doi.org\/10.1029\/2020PA003857.\u00a0article<\/a><\/p>\n

Feakins S.J.<\/strong>, Liddy, H.M.*, Tauxe, L., Galy, V., Feng, X; Tierney, J.E.; Miao, Y.; Warny, S., Miocene C4<\/sub>\u00a0grassland expansion as revealed by the Indus Fan,\u00a0Paleoceanography and Paleoclimatology,\u00a0<\/em>doi.org\/10.1029\/2020PA003856.\u00a0article<\/a>\u00a0data<\/a><\/p>\n

Amazonia:<\/strong><\/h3>\n

Building off our work on modern ecosystems from Peru to Brazil, with calibrations of tropical montane and lowland forests, shrublands and grasslands, and their soils, we planned to move into paleoclimate reconstructions for the Cenozoic in the Amazon Basin.\u00a0Planned for 2020,<\/strong>\u00a0we are on the science parties for IODP\u00a0Expedition 387 Amazon Margin<\/a>\u00a0and ICDP Trans Amazon Drilling Project to collect records of the\u00a0South American<\/strong>\u00a0climate and vegetation change. We await patiently for favorable conditions to resume planned sample collection efforts and the lab and analytical efforts beyond. The quest is towards understanding Cenozoic transitions in Amazonian ecosystems with relevance to the fate of these systems in a warmer future.<\/p>\n\n\n\n<\/div>\n\n\n <\/div><\/div>\n\n\n\n \n \n \n\n\n\n\n\n\n\n

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