Radionuclide and biomarker proxies of past ocean circulation and productivity in the Arabian Sea
We present new excess Pa-231/Th-230 activity ratios and lipid biomarker results from northeastern Arabian Sea sediments (core 93KL) spanning the past 50 ka in an effort to constrain further the relationship between climate at low and high latitudes. Pa-231/Th-230 activity ratios are maintained at va...
Published in: | Geophysical Research Letters |
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Online Access: | https://scholarworks.wm.edu/vimsarticles/1415 https://scholarworks.wm.edu/context/vimsarticles/article/2410/viewcontent/Pourmand_et_al_2005_Geophysical_Research_Letters.pdf |
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ftwilliammarycol:oai:scholarworks.wm.edu:vimsarticles-2410 2023-06-11T04:12:17+02:00 Radionuclide and biomarker proxies of past ocean circulation and productivity in the Arabian Sea Pourmand, A Marcantonio, F Bianchi, TS Canuel, Elizabeth A. Waterson, EJ 2005-05-24T07:00:00Z application/pdf https://scholarworks.wm.edu/vimsarticles/1415 doi: 10.1029/2005GL022612 https://scholarworks.wm.edu/context/vimsarticles/article/2410/viewcontent/Pourmand_et_al_2005_Geophysical_Research_Letters.pdf unknown W&M ScholarWorks https://scholarworks.wm.edu/vimsarticles/1415 doi: 10.1029/2005GL022612 https://scholarworks.wm.edu/context/vimsarticles/article/2410/viewcontent/Pourmand_et_al_2005_Geophysical_Research_Letters.pdf VIMS Articles Climate oscillatioins lothogenic clays Greenland ice Southern ocean Biological Sciences Peer-Reviewed Articles Earth Sciences text 2005 ftwilliammarycol https://doi.org/10.1029/2005GL022612 2023-05-04T17:44:32Z We present new excess Pa-231/Th-230 activity ratios and lipid biomarker results from northeastern Arabian Sea sediments (core 93KL) spanning the past 50 ka in an effort to constrain further the relationship between climate at low and high latitudes. Pa-231/Th-230 activity ratios are maintained at values significantly higher than the water-column production ratio of 0.093. Average Pa-231/Th-230 activity ratios are lower during the last glacial period than during the Holocene. The lowest Pa-231/Th-230 activity ratios coincide with the timing of Heinrich Events 1-5. Profiles of lipid biomarker fluxes and Pa-231/Th-230 activity ratios from 32 to 12 ka show similar patterns, suggesting that Pa-231 is more efficiently scavenged relative to Th-230 at times when diatoms make up a proportionally larger part of the primary biomass signal. In the Holocene, high Pa-231/Th-230 activity ratios may indicate enhanced Pa-231 export from the southern to the northern Indian Ocean via intensified thermohaline circulation. Text Greenland Southern Ocean W&M ScholarWorks Southern Ocean Greenland Indian Geophysical Research Letters 32 10 |
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Open Polar |
collection |
W&M ScholarWorks |
op_collection_id |
ftwilliammarycol |
language |
unknown |
topic |
Climate oscillatioins lothogenic clays Greenland ice Southern ocean Biological Sciences Peer-Reviewed Articles Earth Sciences |
spellingShingle |
Climate oscillatioins lothogenic clays Greenland ice Southern ocean Biological Sciences Peer-Reviewed Articles Earth Sciences Pourmand, A Marcantonio, F Bianchi, TS Canuel, Elizabeth A. Waterson, EJ Radionuclide and biomarker proxies of past ocean circulation and productivity in the Arabian Sea |
topic_facet |
Climate oscillatioins lothogenic clays Greenland ice Southern ocean Biological Sciences Peer-Reviewed Articles Earth Sciences |
description |
We present new excess Pa-231/Th-230 activity ratios and lipid biomarker results from northeastern Arabian Sea sediments (core 93KL) spanning the past 50 ka in an effort to constrain further the relationship between climate at low and high latitudes. Pa-231/Th-230 activity ratios are maintained at values significantly higher than the water-column production ratio of 0.093. Average Pa-231/Th-230 activity ratios are lower during the last glacial period than during the Holocene. The lowest Pa-231/Th-230 activity ratios coincide with the timing of Heinrich Events 1-5. Profiles of lipid biomarker fluxes and Pa-231/Th-230 activity ratios from 32 to 12 ka show similar patterns, suggesting that Pa-231 is more efficiently scavenged relative to Th-230 at times when diatoms make up a proportionally larger part of the primary biomass signal. In the Holocene, high Pa-231/Th-230 activity ratios may indicate enhanced Pa-231 export from the southern to the northern Indian Ocean via intensified thermohaline circulation. |
format |
Text |
author |
Pourmand, A Marcantonio, F Bianchi, TS Canuel, Elizabeth A. Waterson, EJ |
author_facet |
Pourmand, A Marcantonio, F Bianchi, TS Canuel, Elizabeth A. Waterson, EJ |
author_sort |
Pourmand, A |
title |
Radionuclide and biomarker proxies of past ocean circulation and productivity in the Arabian Sea |
title_short |
Radionuclide and biomarker proxies of past ocean circulation and productivity in the Arabian Sea |
title_full |
Radionuclide and biomarker proxies of past ocean circulation and productivity in the Arabian Sea |
title_fullStr |
Radionuclide and biomarker proxies of past ocean circulation and productivity in the Arabian Sea |
title_full_unstemmed |
Radionuclide and biomarker proxies of past ocean circulation and productivity in the Arabian Sea |
title_sort |
radionuclide and biomarker proxies of past ocean circulation and productivity in the arabian sea |
publisher |
W&M ScholarWorks |
publishDate |
2005 |
url |
https://scholarworks.wm.edu/vimsarticles/1415 https://scholarworks.wm.edu/context/vimsarticles/article/2410/viewcontent/Pourmand_et_al_2005_Geophysical_Research_Letters.pdf |
geographic |
Southern Ocean Greenland Indian |
geographic_facet |
Southern Ocean Greenland Indian |
genre |
Greenland Southern Ocean |
genre_facet |
Greenland Southern Ocean |
op_source |
VIMS Articles |
op_relation |
https://scholarworks.wm.edu/vimsarticles/1415 doi: 10.1029/2005GL022612 https://scholarworks.wm.edu/context/vimsarticles/article/2410/viewcontent/Pourmand_et_al_2005_Geophysical_Research_Letters.pdf |
op_doi |
https://doi.org/10.1029/2005GL022612 |
container_title |
Geophysical Research Letters |
container_volume |
32 |
container_issue |
10 |
_version_ |
1768388026341261312 |