Phase lag between Intertropical Convergence Zone migration and subtropical monsoon onset over the northwestern Indian Ocean during Marine Isotopic Substage 6.5 (MIS 6.5).
[1] High-resolution faunal and isotopic analyses of foraminifera were performed on core MD96-2073 (10°94 0 N, 52°62 0 E, 3142 m depth), located close to Socotra Island in the upwelling area of the Somali Basin (NW Indian Ocean). This work focuses on Marine Isotopic Stage 6.5 in order to reconstruct...
Published in: | Geochemistry, Geophysics, Geosystems |
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Main Authors: | , , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2006
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Subjects: | |
Online Access: | https://hal.science/hal-00162959 https://hal.science/hal-00162959/document https://hal.science/hal-00162959/file/2006GC001353.pdf https://doi.org/10.1029/2006GC001353 |
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EPHE (Ecole pratique des hautes études, Paris): HAL |
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English |
topic |
paleoclimatology foraminifera isotopes Indian monsoon ITCZ sapropels upwelling [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology |
spellingShingle |
paleoclimatology foraminifera isotopes Indian monsoon ITCZ sapropels upwelling [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology Malaizé, B. Joly, C. Vénec-Peyré, M.T. Bassinot, F. Caillon, N. Charlier, Karine Phase lag between Intertropical Convergence Zone migration and subtropical monsoon onset over the northwestern Indian Ocean during Marine Isotopic Substage 6.5 (MIS 6.5). |
topic_facet |
paleoclimatology foraminifera isotopes Indian monsoon ITCZ sapropels upwelling [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology |
description |
[1] High-resolution faunal and isotopic analyses of foraminifera were performed on core MD96-2073 (10°94 0 N, 52°62 0 E, 3142 m depth), located close to Socotra Island in the upwelling area of the Somali Basin (NW Indian Ocean). This work focuses on Marine Isotopic Stage 6.5 in order to reconstruct paleo-upwelling changes and their links with the Arabian Sea summer monsoon and the migration of the Intertropical Convergence Zone (ITCZ). Correspondence and cluster analyses of planktonic foraminiferal abundances, partly controlled by temperature and water mass productivity, together with an upwelling intensification index, show the occurrence of a strong upwelling between 176 and 165 ka. This upwelling intensification responds to a northward migration of the ITCZ. An isotopic depletion in the planktonic foraminifera d 18 O records occurring between 180 and 167 ka is interpreted as proof of a large salinity decrease in the surface waters, probably linked to a strong input of fresh rainfall waters induced by an intense monsoon activity. The lag between the onset of upwelling intensification and the strong monsoonal impact over the same area suggests a decoupling between both phenomena. The migration of the ITCZ is influenced by obliquity and precessional forcing, while the Arabian Sea summer monsoon precipitation depends only on precessional forcing. |
author2 |
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) Paléobiodiversité et paléoenvironnements Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 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) Paléocéanographie (PALEOCEAN) 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 |
Malaizé, B. Joly, C. Vénec-Peyré, M.T. Bassinot, F. Caillon, N. Charlier, Karine |
author_facet |
Malaizé, B. Joly, C. Vénec-Peyré, M.T. Bassinot, F. Caillon, N. Charlier, Karine |
author_sort |
Malaizé, B. |
title |
Phase lag between Intertropical Convergence Zone migration and subtropical monsoon onset over the northwestern Indian Ocean during Marine Isotopic Substage 6.5 (MIS 6.5). |
title_short |
Phase lag between Intertropical Convergence Zone migration and subtropical monsoon onset over the northwestern Indian Ocean during Marine Isotopic Substage 6.5 (MIS 6.5). |
title_full |
Phase lag between Intertropical Convergence Zone migration and subtropical monsoon onset over the northwestern Indian Ocean during Marine Isotopic Substage 6.5 (MIS 6.5). |
title_fullStr |
Phase lag between Intertropical Convergence Zone migration and subtropical monsoon onset over the northwestern Indian Ocean during Marine Isotopic Substage 6.5 (MIS 6.5). |
title_full_unstemmed |
Phase lag between Intertropical Convergence Zone migration and subtropical monsoon onset over the northwestern Indian Ocean during Marine Isotopic Substage 6.5 (MIS 6.5). |
title_sort |
phase lag between intertropical convergence zone migration and subtropical monsoon onset over the northwestern indian ocean during marine isotopic substage 6.5 (mis 6.5). |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00162959 https://hal.science/hal-00162959/document https://hal.science/hal-00162959/file/2006GC001353.pdf https://doi.org/10.1029/2006GC001353 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-00162959 Geochemistry, Geophysics, Geosystems, 2006, 7, pp.Q12N08. ⟨10.1029/2006GC001353⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2006GC001353 hal-00162959 https://hal.science/hal-00162959 https://hal.science/hal-00162959/document https://hal.science/hal-00162959/file/2006GC001353.pdf doi:10.1029/2006GC001353 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2006GC001353 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
7 |
container_issue |
12 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1810472676977803264 |
spelling |
ftecolephe:oai:HAL:hal-00162959v1 2024-09-15T18:31:04+00:00 Phase lag between Intertropical Convergence Zone migration and subtropical monsoon onset over the northwestern Indian Ocean during Marine Isotopic Substage 6.5 (MIS 6.5). Malaizé, B. Joly, C. Vénec-Peyré, M.T. Bassinot, F. Caillon, N. Charlier, Karine 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) Paléobiodiversité et paléoenvironnements Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 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) Paléocéanographie (PALEOCEAN) 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)) 2006 https://hal.science/hal-00162959 https://hal.science/hal-00162959/document https://hal.science/hal-00162959/file/2006GC001353.pdf https://doi.org/10.1029/2006GC001353 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1029/2006GC001353 hal-00162959 https://hal.science/hal-00162959 https://hal.science/hal-00162959/document https://hal.science/hal-00162959/file/2006GC001353.pdf doi:10.1029/2006GC001353 info:eu-repo/semantics/OpenAccess EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-00162959 Geochemistry, Geophysics, Geosystems, 2006, 7, pp.Q12N08. ⟨10.1029/2006GC001353⟩ paleoclimatology foraminifera isotopes Indian monsoon ITCZ sapropels upwelling [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology info:eu-repo/semantics/article Journal articles 2006 ftecolephe https://doi.org/10.1029/2006GC001353 2024-07-22T23:39:13Z [1] High-resolution faunal and isotopic analyses of foraminifera were performed on core MD96-2073 (10°94 0 N, 52°62 0 E, 3142 m depth), located close to Socotra Island in the upwelling area of the Somali Basin (NW Indian Ocean). This work focuses on Marine Isotopic Stage 6.5 in order to reconstruct paleo-upwelling changes and their links with the Arabian Sea summer monsoon and the migration of the Intertropical Convergence Zone (ITCZ). Correspondence and cluster analyses of planktonic foraminiferal abundances, partly controlled by temperature and water mass productivity, together with an upwelling intensification index, show the occurrence of a strong upwelling between 176 and 165 ka. This upwelling intensification responds to a northward migration of the ITCZ. An isotopic depletion in the planktonic foraminifera d 18 O records occurring between 180 and 167 ka is interpreted as proof of a large salinity decrease in the surface waters, probably linked to a strong input of fresh rainfall waters induced by an intense monsoon activity. The lag between the onset of upwelling intensification and the strong monsoonal impact over the same area suggests a decoupling between both phenomena. The migration of the ITCZ is influenced by obliquity and precessional forcing, while the Arabian Sea summer monsoon precipitation depends only on precessional forcing. Article in Journal/Newspaper Planktonic foraminifera EPHE (Ecole pratique des hautes études, Paris): HAL Geochemistry, Geophysics, Geosystems 7 12 n/a n/a |