Using data assimilation to investigate the causes of Southern Hemisphere high latitude cooling from 10 to 8 ka BP
International audience From 10 to 8 ka BP (thousand years before present), paleoclimate records show an atmospheric and oceanic cooling in the high latitudes of the Southern Hemisphere. During this interval, temperatures estimated from proxy data decrease by 0.8 • C over Antarctica and 1.2 • C over...
Published in: | Climate of the Past |
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Main Authors: | , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2013
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Subjects: | |
Online Access: | https://hal.science/hal-02105622 https://hal.science/hal-02105622/document https://hal.science/hal-02105622/file/Mathiot_CP2013.pdf https://doi.org/10.5194/cp-9-887-2013 |
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EPHE (Ecole pratique des hautes études, Paris): HAL |
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English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Mathiot, P. Goosse, H. Crosta, X. Stenni, B. Braida, M. Renssen, H. van Meerbeeck, C. J. Masson-Delmotte, Valérie Mairesse, A. Dubinkina, S. Using data assimilation to investigate the causes of Southern Hemisphere high latitude cooling from 10 to 8 ka BP |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience From 10 to 8 ka BP (thousand years before present), paleoclimate records show an atmospheric and oceanic cooling in the high latitudes of the Southern Hemisphere. During this interval, temperatures estimated from proxy data decrease by 0.8 • C over Antarctica and 1.2 • C over the Southern Ocean. In order to study the causes of this cooling, simulations covering the early Holocene have been performed with the climate model of intermediate complexity LOVECLIM constrained to follow the signal recorded in climate proxies using a data assimilation method based on a particle filtering approach. The selected proxies represent oceanic and atmospheric surface temperature in the Southern Hemisphere derived from terrestrial, marine and glacio-logical records. Two mechanisms previously suggested to explain the 10-8 ka BP cooling pattern are investigated using the data assimilation approach in our model. The first hypothesis is a change in atmospheric circulation, and the second one is a cooling of the sea surface temperature in the Southern Ocean, driven in our experimental setup by the impact of an increased West Antarctic melting rate on ocean circulation. For the atmosphere hypothesis, the climate state obtained by data assimilation produces a modification of the meridional atmospheric circulation leading to a 0.5 • C Antarctic cooling from 10 to 8 ka BP compared to the simulation without data assimilation, without congruent cooling of the atmospheric and sea surface temperature in the Southern Ocean. For the ocean hypothesis, the increased West Antarctic freshwater flux constrainted by data assimilation (+100 mSv from 10 to 8 ka BP) leads to an oceanic cooling of 0.7 • C and a strengthening of Southern Hemisphere westerlies (+6 %). Thus, according to our experiments, the observed cooling in Antarctic and the Southern Ocean proxy records can only be reconciled with the reconstructions by the combination of a modified atmospheric circulation and an enhanced freshwater flux. |
author2 |
Université Catholique de Louvain = Catholic University of Louvain (UCL) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Centre Georges Lemaître for Earth and Climate Research Louvain (TECLIM) Earth and Life Institute Louvain-La-Neuve (ELI) Université Catholique de Louvain = Catholic University of Louvain (UCL)-Université Catholique de Louvain = Catholic University of Louvain (UCL) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Dipartimento di Matematica e Geoscienze Trieste Università degli studi di Trieste = University of Trieste Vrije Universiteit Amsterdam Amsterdam (VU) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) |
format |
Article in Journal/Newspaper |
author |
Mathiot, P. Goosse, H. Crosta, X. Stenni, B. Braida, M. Renssen, H. van Meerbeeck, C. J. Masson-Delmotte, Valérie Mairesse, A. Dubinkina, S. |
author_facet |
Mathiot, P. Goosse, H. Crosta, X. Stenni, B. Braida, M. Renssen, H. van Meerbeeck, C. J. Masson-Delmotte, Valérie Mairesse, A. Dubinkina, S. |
author_sort |
Mathiot, P. |
title |
Using data assimilation to investigate the causes of Southern Hemisphere high latitude cooling from 10 to 8 ka BP |
title_short |
Using data assimilation to investigate the causes of Southern Hemisphere high latitude cooling from 10 to 8 ka BP |
title_full |
Using data assimilation to investigate the causes of Southern Hemisphere high latitude cooling from 10 to 8 ka BP |
title_fullStr |
Using data assimilation to investigate the causes of Southern Hemisphere high latitude cooling from 10 to 8 ka BP |
title_full_unstemmed |
Using data assimilation to investigate the causes of Southern Hemisphere high latitude cooling from 10 to 8 ka BP |
title_sort |
using data assimilation to investigate the causes of southern hemisphere high latitude cooling from 10 to 8 ka bp |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.science/hal-02105622 https://hal.science/hal-02105622/document https://hal.science/hal-02105622/file/Mathiot_CP2013.pdf https://doi.org/10.5194/cp-9-887-2013 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-02105622 Climate of the Past, 2013, 9 (2), pp.887-901. ⟨10.5194/cp-9-887-2013⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-9-887-2013 hal-02105622 https://hal.science/hal-02105622 https://hal.science/hal-02105622/document https://hal.science/hal-02105622/file/Mathiot_CP2013.pdf doi:10.5194/cp-9-887-2013 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-9-887-2013 |
container_title |
Climate of the Past |
container_volume |
9 |
container_issue |
2 |
container_start_page |
887 |
op_container_end_page |
901 |
_version_ |
1801383634231361536 |
spelling |
ftecolephe:oai:HAL:hal-02105622v1 2024-06-09T07:40:10+00:00 Using data assimilation to investigate the causes of Southern Hemisphere high latitude cooling from 10 to 8 ka BP Mathiot, P. Goosse, H. Crosta, X. Stenni, B. Braida, M. Renssen, H. van Meerbeeck, C. J. Masson-Delmotte, Valérie Mairesse, A. Dubinkina, S. Université Catholique de Louvain = Catholic University of Louvain (UCL) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Centre Georges Lemaître for Earth and Climate Research Louvain (TECLIM) Earth and Life Institute Louvain-La-Neuve (ELI) Université Catholique de Louvain = Catholic University of Louvain (UCL)-Université Catholique de Louvain = Catholic University of Louvain (UCL) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Dipartimento di Matematica e Geoscienze Trieste Università degli studi di Trieste = University of Trieste Vrije Universiteit Amsterdam Amsterdam (VU) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) 2013 https://hal.science/hal-02105622 https://hal.science/hal-02105622/document https://hal.science/hal-02105622/file/Mathiot_CP2013.pdf https://doi.org/10.5194/cp-9-887-2013 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-9-887-2013 hal-02105622 https://hal.science/hal-02105622 https://hal.science/hal-02105622/document https://hal.science/hal-02105622/file/Mathiot_CP2013.pdf doi:10.5194/cp-9-887-2013 info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-02105622 Climate of the Past, 2013, 9 (2), pp.887-901. ⟨10.5194/cp-9-887-2013⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2013 ftecolephe https://doi.org/10.5194/cp-9-887-2013 2024-05-16T11:03:11Z International audience From 10 to 8 ka BP (thousand years before present), paleoclimate records show an atmospheric and oceanic cooling in the high latitudes of the Southern Hemisphere. During this interval, temperatures estimated from proxy data decrease by 0.8 • C over Antarctica and 1.2 • C over the Southern Ocean. In order to study the causes of this cooling, simulations covering the early Holocene have been performed with the climate model of intermediate complexity LOVECLIM constrained to follow the signal recorded in climate proxies using a data assimilation method based on a particle filtering approach. The selected proxies represent oceanic and atmospheric surface temperature in the Southern Hemisphere derived from terrestrial, marine and glacio-logical records. Two mechanisms previously suggested to explain the 10-8 ka BP cooling pattern are investigated using the data assimilation approach in our model. The first hypothesis is a change in atmospheric circulation, and the second one is a cooling of the sea surface temperature in the Southern Ocean, driven in our experimental setup by the impact of an increased West Antarctic melting rate on ocean circulation. For the atmosphere hypothesis, the climate state obtained by data assimilation produces a modification of the meridional atmospheric circulation leading to a 0.5 • C Antarctic cooling from 10 to 8 ka BP compared to the simulation without data assimilation, without congruent cooling of the atmospheric and sea surface temperature in the Southern Ocean. For the ocean hypothesis, the increased West Antarctic freshwater flux constrainted by data assimilation (+100 mSv from 10 to 8 ka BP) leads to an oceanic cooling of 0.7 • C and a strengthening of Southern Hemisphere westerlies (+6 %). Thus, according to our experiments, the observed cooling in Antarctic and the Southern Ocean proxy records can only be reconciled with the reconstructions by the combination of a modified atmospheric circulation and an enhanced freshwater flux. Article in Journal/Newspaper Antarc* Antarctic Antarctica Southern Ocean EPHE (Ecole pratique des hautes études, Paris): HAL Antarctic Southern Ocean Climate of the Past 9 2 887 901 |