Northeastern Indian Ocean paleoceanography and Indian monsoon variability reconstructed from Miocene sediment archives (IODP Expedition 353)
International audience
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HAL CCSD
2020
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| Online Access: | https://hal.science/hal-03004035 |
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ftcollegfrance:oai:HAL:hal-03004035v1 2024-06-23T07:46:28+00:00 Northeastern Indian Ocean paleoceanography and Indian monsoon variability reconstructed from Miocene sediment archives (IODP Expedition 353) Late Neogene sediment archives at the margins of the Bay of Bengal and Andaman Sea (IODP Expedition 353, iMonsoon) record Indian Ocean intermediate- and deep-water circulation and Indian Monsoon variability in unprecedented resolution. Site U1443 (2925 m water depth), drilled on the crest of the Ninetyeast Ridge at the southern end of the Bay of Bengal, provided the first high-resolution deep-water record extending back to 17 Ma. Benthic foraminiferal isotope records in combination with micropaleontological and geochemical dissolution indices based on X-ray fluorescence (XRF) scanner derived elemental data track the abrupt onset and development of the Miocene Climatic Optimum with eccentricity-paced transient carbonate dissolution events coinciding with warmer phases, followed by major expansion of the East Antarctic ice sheet. We relate intense carbonate dissolution episodes between ~13.2 and ~8.5 Ma to changes in the intensity of chemical weathering and riverine input of calcium and carbonate ions into the ocean reservoir linked to latitudinal shifts of the monsoonal rainbelt. Recovery from the “Carbonate Crash” in the tropical eastern Indian Ocean was coupled to a marked increase in biological productivity, associated with strengthening of monsoonal winds and upper ocean mixing. At Sites U1447 (1392 m water depth) and U1448 (1098 m water depth) in the Andaman Sea, orbitally tuned, high-resolution benthic isotope records and XRF scanner derived elemental data, combined with mixed layer temperature/salinity reconstructions from paired stable isotope and Mg/Ca records closely track changes in the intensity of the Indian summer monsoon rainfall after ~10 Ma. Major changes in the response of the Indian Monsoon to orbital forcing towards an obliquity driven glacial-interglacial mode between ~7 and ~5.5 Ma were associated with intense, pulsed cooling of surface and intermediate waters and changes in the amount and composition of the monsoonal discharge from the Asian continent into the Andaman Sea. Kuhnt, Wolfgang Holbourn, Ann, E Janika, Jöhnck, Lübbers, Julia Kochhann, Karlos Andersen, Nils Bolton, C. T. Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Washington DC, United States 2020-01-06 https://hal.science/hal-03004035 en eng HAL CCSD hal-03004035 https://hal.science/hal-03004035 AGU Chapman Conference 2020 https://hal.science/hal-03004035 AGU Chapman Conference 2020, Jan 2020, Washington DC, United States [SDE]Environmental Sciences info:eu-repo/semantics/conferenceObject Conference papers 2020 ftcollegfrance 2024-06-13T23:38:27Z International audience Conference Object Antarc* Antarctic Ice Sheet Collège de France: HAL Antarctic East Antarctic Ice Sheet Indian |
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Open Polar |
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Collège de France: HAL |
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ftcollegfrance |
| language |
English |
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[SDE]Environmental Sciences |
| spellingShingle |
[SDE]Environmental Sciences Kuhnt, Wolfgang Holbourn, Ann, E Janika, Jöhnck, Lübbers, Julia Kochhann, Karlos Andersen, Nils Bolton, C. T. Northeastern Indian Ocean paleoceanography and Indian monsoon variability reconstructed from Miocene sediment archives (IODP Expedition 353) |
| topic_facet |
[SDE]Environmental Sciences |
| description |
International audience |
| author2 |
Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) |
| format |
Conference Object |
| author |
Kuhnt, Wolfgang Holbourn, Ann, E Janika, Jöhnck, Lübbers, Julia Kochhann, Karlos Andersen, Nils Bolton, C. T. |
| author_facet |
Kuhnt, Wolfgang Holbourn, Ann, E Janika, Jöhnck, Lübbers, Julia Kochhann, Karlos Andersen, Nils Bolton, C. T. |
| author_sort |
Kuhnt, Wolfgang |
| title |
Northeastern Indian Ocean paleoceanography and Indian monsoon variability reconstructed from Miocene sediment archives (IODP Expedition 353) |
| title_short |
Northeastern Indian Ocean paleoceanography and Indian monsoon variability reconstructed from Miocene sediment archives (IODP Expedition 353) |
| title_full |
Northeastern Indian Ocean paleoceanography and Indian monsoon variability reconstructed from Miocene sediment archives (IODP Expedition 353) |
| title_fullStr |
Northeastern Indian Ocean paleoceanography and Indian monsoon variability reconstructed from Miocene sediment archives (IODP Expedition 353) |
| title_full_unstemmed |
Northeastern Indian Ocean paleoceanography and Indian monsoon variability reconstructed from Miocene sediment archives (IODP Expedition 353) |
| title_sort |
northeastern indian ocean paleoceanography and indian monsoon variability reconstructed from miocene sediment archives (iodp expedition 353) |
| publisher |
HAL CCSD |
| publishDate |
2020 |
| url |
https://hal.science/hal-03004035 |
| op_coverage |
Washington DC, United States |
| geographic |
Antarctic East Antarctic Ice Sheet Indian |
| geographic_facet |
Antarctic East Antarctic Ice Sheet Indian |
| genre |
Antarc* Antarctic Ice Sheet |
| genre_facet |
Antarc* Antarctic Ice Sheet |
| op_source |
AGU Chapman Conference 2020 https://hal.science/hal-03004035 AGU Chapman Conference 2020, Jan 2020, Washington DC, United States |
| op_relation |
hal-03004035 https://hal.science/hal-03004035 |
| _version_ |
1802646160172646400 |