Synchronous cooling and decline in monsoonal rainfall in northeastern Tibet during the fall into the Oligocene icehouse
International audience The fall into the Oligocene icehouse is marked by a steady decline in global temperature with punctuated cooling at the Eocene-Oligocene transition, both of which are well documented in the marine realm. However, the chronology and mechanisms of cooling on land remain unclear....
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Online Access: | https://insu.hal.science/insu-02060438 https://doi.org/10.1130/G45480.1 |
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ftunivrennes1hal:oai:HAL:insu-02060438v1 2024-02-11T09:56:20+01:00 Synchronous cooling and decline in monsoonal rainfall in northeastern Tibet during the fall into the Oligocene icehouse Page, M. Licht, Alexis Dupont-Nivet, Guillaume Meijer, N. Barbolini, N. Hoorn, C. Schauer, A. Huntington, K. Bajnai, D. Fiebig, J. Mulch, A. Guo, Z. University of Washington Seattle Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) University of Potsdam = Universität Potsdam 2019-03-01 https://insu.hal.science/insu-02060438 https://doi.org/10.1130/G45480.1 en eng HAL CCSD Geological Society of America info:eu-repo/semantics/altIdentifier/doi/10.1130/G45480.1 insu-02060438 https://insu.hal.science/insu-02060438 doi:10.1130/G45480.1 ISSN: 0091-7613 EISSN: 1943-2682 Geology https://insu.hal.science/insu-02060438 Geology, 2019, 47 (3), pp.203-206. ⟨10.1130/G45480.1⟩ [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2019 ftunivrennes1hal https://doi.org/10.1130/G45480.1 2024-01-23T23:52:59Z International audience The fall into the Oligocene icehouse is marked by a steady decline in global temperature with punctuated cooling at the Eocene-Oligocene transition, both of which are well documented in the marine realm. However, the chronology and mechanisms of cooling on land remain unclear. Here, we use clumped isotope thermometry on northeastern Tibetan continental carbonates to reconstruct a detailed Paleogene surface temperature record for the Asian continental interior, and correlate this to an enhanced pollen data set. Our results show two successive dramatic (>9 °C) temperature drops, at 37 Ma and at 33.5 Ma. These large-magnitude decreases in continental temperatures can only be explained by a combination of both regional cooling and shifts of the rainy season to cooler months, which we interpret to reflect a decline of monsoonal intensity. Our results suggest that the response of Asian surface temperatures and monsoonal rainfall to the steady decline of atmospheric CO2 and global temperature through the late Eocene was nonlinear and occurred in two steps separated by a period of climatic instability. Our results support the onset of the Antarctic Circumpolar Current coeval to the Oligocene isotope event 1 (Oi-1) glaciation at 33.5 Ma, reshaping the distribution of surface heat worldwide; however, the origin of the 37 Ma cooling event remains less clear. Article in Journal/Newspaper Antarc* Antarctic Université de Rennes 1: Publications scientifiques (HAL) Antarctic The Antarctic Geology 47 3 203 206 |
institution |
Open Polar |
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Université de Rennes 1: Publications scientifiques (HAL) |
op_collection_id |
ftunivrennes1hal |
language |
English |
topic |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Page, M. Licht, Alexis Dupont-Nivet, Guillaume Meijer, N. Barbolini, N. Hoorn, C. Schauer, A. Huntington, K. Bajnai, D. Fiebig, J. Mulch, A. Guo, Z. Synchronous cooling and decline in monsoonal rainfall in northeastern Tibet during the fall into the Oligocene icehouse |
topic_facet |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience The fall into the Oligocene icehouse is marked by a steady decline in global temperature with punctuated cooling at the Eocene-Oligocene transition, both of which are well documented in the marine realm. However, the chronology and mechanisms of cooling on land remain unclear. Here, we use clumped isotope thermometry on northeastern Tibetan continental carbonates to reconstruct a detailed Paleogene surface temperature record for the Asian continental interior, and correlate this to an enhanced pollen data set. Our results show two successive dramatic (>9 °C) temperature drops, at 37 Ma and at 33.5 Ma. These large-magnitude decreases in continental temperatures can only be explained by a combination of both regional cooling and shifts of the rainy season to cooler months, which we interpret to reflect a decline of monsoonal intensity. Our results suggest that the response of Asian surface temperatures and monsoonal rainfall to the steady decline of atmospheric CO2 and global temperature through the late Eocene was nonlinear and occurred in two steps separated by a period of climatic instability. Our results support the onset of the Antarctic Circumpolar Current coeval to the Oligocene isotope event 1 (Oi-1) glaciation at 33.5 Ma, reshaping the distribution of surface heat worldwide; however, the origin of the 37 Ma cooling event remains less clear. |
author2 |
University of Washington Seattle Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) University of Potsdam = Universität Potsdam |
format |
Article in Journal/Newspaper |
author |
Page, M. Licht, Alexis Dupont-Nivet, Guillaume Meijer, N. Barbolini, N. Hoorn, C. Schauer, A. Huntington, K. Bajnai, D. Fiebig, J. Mulch, A. Guo, Z. |
author_facet |
Page, M. Licht, Alexis Dupont-Nivet, Guillaume Meijer, N. Barbolini, N. Hoorn, C. Schauer, A. Huntington, K. Bajnai, D. Fiebig, J. Mulch, A. Guo, Z. |
author_sort |
Page, M. |
title |
Synchronous cooling and decline in monsoonal rainfall in northeastern Tibet during the fall into the Oligocene icehouse |
title_short |
Synchronous cooling and decline in monsoonal rainfall in northeastern Tibet during the fall into the Oligocene icehouse |
title_full |
Synchronous cooling and decline in monsoonal rainfall in northeastern Tibet during the fall into the Oligocene icehouse |
title_fullStr |
Synchronous cooling and decline in monsoonal rainfall in northeastern Tibet during the fall into the Oligocene icehouse |
title_full_unstemmed |
Synchronous cooling and decline in monsoonal rainfall in northeastern Tibet during the fall into the Oligocene icehouse |
title_sort |
synchronous cooling and decline in monsoonal rainfall in northeastern tibet during the fall into the oligocene icehouse |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://insu.hal.science/insu-02060438 https://doi.org/10.1130/G45480.1 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 0091-7613 EISSN: 1943-2682 Geology https://insu.hal.science/insu-02060438 Geology, 2019, 47 (3), pp.203-206. ⟨10.1130/G45480.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1130/G45480.1 insu-02060438 https://insu.hal.science/insu-02060438 doi:10.1130/G45480.1 |
op_doi |
https://doi.org/10.1130/G45480.1 |
container_title |
Geology |
container_volume |
47 |
container_issue |
3 |
container_start_page |
203 |
op_container_end_page |
206 |
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1790602328386043904 |