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)
High-resolution faunal and isotopic analyses of foraminifera were performed on core MD96-2073 (10 degrees 94'N, 52 degrees 62'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 or...
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Online Access: | https://doi.org/10.1029/2006GC001353 https://archimer.ifremer.fr/doc/00234/34487/33433.pdf https://archimer.ifremer.fr/doc/00234/34487/ |
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fttriple:oai:gotriple.eu:10670/1.2mnmf5 2023-05-15T18:00:56+02:00 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) Malaize, B. Joly, C. Venec-peyre, M. -t. Bassinot, F. Caillon, N. Charlier, K. 2006-01-01 https://doi.org/10.1029/2006GC001353 https://archimer.ifremer.fr/doc/00234/34487/33433.pdf https://archimer.ifremer.fr/doc/00234/34487/ en eng Amer Geophysical Union doi:10.1029/2006GC001353 10670/1.2mnmf5 https://archimer.ifremer.fr/doc/00234/34487/33433.pdf https://archimer.ifremer.fr/doc/00234/34487/ other Archimer, archive institutionnelle de l'Ifremer Geochemistry Geophysics Geosystems (1525-2027) (Amer Geophysical Union), 2006-12 , Vol. 7 , N. 12/ Q12N08 , P. 1-16 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2006 fttriple https://doi.org/10.1029/2006GC001353 2023-01-22T17:41:21Z High-resolution faunal and isotopic analyses of foraminifera were performed on core MD96-2073 (10 degrees 94'N, 52 degrees 62'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 delta(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. Text Planktonic foraminifera Unknown Indian Geochemistry, Geophysics, Geosystems 7 12 n/a n/a |
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envir geo Malaize, B. Joly, C. Venec-peyre, M. -t. Bassinot, F. Caillon, N. Charlier, K. 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 |
envir geo |
description |
High-resolution faunal and isotopic analyses of foraminifera were performed on core MD96-2073 (10 degrees 94'N, 52 degrees 62'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 delta(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. |
format |
Text |
author |
Malaize, B. Joly, C. Venec-peyre, M. -t. Bassinot, F. Caillon, N. Charlier, K. |
author_facet |
Malaize, B. Joly, C. Venec-peyre, M. -t. Bassinot, F. Caillon, N. Charlier, K. |
author_sort |
Malaize, 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 |
Amer Geophysical Union |
publishDate |
2006 |
url |
https://doi.org/10.1029/2006GC001353 https://archimer.ifremer.fr/doc/00234/34487/33433.pdf https://archimer.ifremer.fr/doc/00234/34487/ |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Archimer, archive institutionnelle de l'Ifremer Geochemistry Geophysics Geosystems (1525-2027) (Amer Geophysical Union), 2006-12 , Vol. 7 , N. 12/ Q12N08 , P. 1-16 |
op_relation |
doi:10.1029/2006GC001353 10670/1.2mnmf5 https://archimer.ifremer.fr/doc/00234/34487/33433.pdf https://archimer.ifremer.fr/doc/00234/34487/ |
op_rights |
other |
op_doi |
https://doi.org/10.1029/2006GC001353 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
7 |
container_issue |
12 |
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n/a |
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1766170215604813824 |