Variations in productivity and eolian £uxes in the northeastern Arabian Sea during the past 110 ka
High-resolution (one to two samples/ka) radionuclide proxy records from core 93KL in the northeastern Arabian Sea provide evidence for millennial climate variability over the past 110 ka. We interpret 230Th-normalized 232Th fluxes as a proxy for eolian input, and authigenic uranium concentrations as...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.502.1925 2023-05-15T16:39:14+02:00 Variations in productivity and eolian £uxes in the northeastern Arabian Sea during the past 110 ka Ali Pourm Franco Marcantonio A Hartmut Schulz B The Pennsylvania State University CiteSeerX Archives 2004 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.502.1925 http://geotest.tamu.edu/userfiles/23/pourmandetal2004.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.502.1925 http://geotest.tamu.edu/userfiles/23/pourmandetal2004.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://geotest.tamu.edu/userfiles/23/pourmandetal2004.pdf millennial variations Indian Ocean monsoon eolian £ux productivity uranium^thorium text 2004 ftciteseerx 2016-01-08T09:11:18Z High-resolution (one to two samples/ka) radionuclide proxy records from core 93KL in the northeastern Arabian Sea provide evidence for millennial climate variability over the past 110 ka. We interpret 230Th-normalized 232Th fluxes as a proxy for eolian input, and authigenic uranium concentrations as a proxy for past productivity. We attribute orbital and suborbital variations in both proxies to changes in the intensity of the southwest Indian Ocean monsoon. The highest 230Th-normalized 232Th fluxes occur at times that are consistent with the timing of the Younger Dryas, Heinrich events 1^7 and cold Dansgaard^Oeschger stadial events recorded in the GISP2 ice core. Such high dust fluxes may be due to a weakened southwest monsoon in conjunction with strengthened northwesterlies from the Arabian Peninsula and Mesopotamia. Authigenic uranium concentrations, on the other hand, are highest during warm Dansgaard^Oeschger interstadials when the southwest monsoon is intensified relative to the northwesterly winds. Our results also indicate that on orbital timescales maximum average eolian fluxes coincide with the timing of marine isotopic stage (MIS) 2 and 4, while minimum fluxes occur during MIS 1, 3 and 5. Although the forcing mechanism(s) controlling suborbital variabilities in monsoonal intensity is still debated, our findings suggest an atmospheric teleconnection between the low-latitude southwest monsoon and North Atlantic climate. Text ice core North Atlantic Unknown Indian |
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English |
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millennial variations Indian Ocean monsoon eolian £ux productivity uranium^thorium |
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millennial variations Indian Ocean monsoon eolian £ux productivity uranium^thorium Ali Pourm Franco Marcantonio A Hartmut Schulz B Variations in productivity and eolian £uxes in the northeastern Arabian Sea during the past 110 ka |
topic_facet |
millennial variations Indian Ocean monsoon eolian £ux productivity uranium^thorium |
description |
High-resolution (one to two samples/ka) radionuclide proxy records from core 93KL in the northeastern Arabian Sea provide evidence for millennial climate variability over the past 110 ka. We interpret 230Th-normalized 232Th fluxes as a proxy for eolian input, and authigenic uranium concentrations as a proxy for past productivity. We attribute orbital and suborbital variations in both proxies to changes in the intensity of the southwest Indian Ocean monsoon. The highest 230Th-normalized 232Th fluxes occur at times that are consistent with the timing of the Younger Dryas, Heinrich events 1^7 and cold Dansgaard^Oeschger stadial events recorded in the GISP2 ice core. Such high dust fluxes may be due to a weakened southwest monsoon in conjunction with strengthened northwesterlies from the Arabian Peninsula and Mesopotamia. Authigenic uranium concentrations, on the other hand, are highest during warm Dansgaard^Oeschger interstadials when the southwest monsoon is intensified relative to the northwesterly winds. Our results also indicate that on orbital timescales maximum average eolian fluxes coincide with the timing of marine isotopic stage (MIS) 2 and 4, while minimum fluxes occur during MIS 1, 3 and 5. Although the forcing mechanism(s) controlling suborbital variabilities in monsoonal intensity is still debated, our findings suggest an atmospheric teleconnection between the low-latitude southwest monsoon and North Atlantic climate. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Ali Pourm Franco Marcantonio A Hartmut Schulz B |
author_facet |
Ali Pourm Franco Marcantonio A Hartmut Schulz B |
author_sort |
Ali Pourm |
title |
Variations in productivity and eolian £uxes in the northeastern Arabian Sea during the past 110 ka |
title_short |
Variations in productivity and eolian £uxes in the northeastern Arabian Sea during the past 110 ka |
title_full |
Variations in productivity and eolian £uxes in the northeastern Arabian Sea during the past 110 ka |
title_fullStr |
Variations in productivity and eolian £uxes in the northeastern Arabian Sea during the past 110 ka |
title_full_unstemmed |
Variations in productivity and eolian £uxes in the northeastern Arabian Sea during the past 110 ka |
title_sort |
variations in productivity and eolian £uxes in the northeastern arabian sea during the past 110 ka |
publishDate |
2004 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.502.1925 http://geotest.tamu.edu/userfiles/23/pourmandetal2004.pdf |
geographic |
Indian |
geographic_facet |
Indian |
genre |
ice core North Atlantic |
genre_facet |
ice core North Atlantic |
op_source |
http://geotest.tamu.edu/userfiles/23/pourmandetal2004.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.502.1925 http://geotest.tamu.edu/userfiles/23/pourmandetal2004.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766029560813453312 |