Hyperstratification following glacial overturning events in the northern Arabian Sea
[1] Correlations between Arabian Sea organic carbon and GISP2 d18O records indicate a pronounced oxygen minimum zone (OMZ) during interstadials, whereas well-oxygenated conditions prevailed during stadials. Local deep winter mixing ventilated intermediate water during the coldest stadials, correspon...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/31626 2023-07-23T04:20:39+02:00 Hyperstratification following glacial overturning events in the northern Arabian Sea Reichart, G.-J. Brinkhuis, H. Huiskamp, F. Zachariasse, W.J. 2004 image/pdf https://dspace.library.uu.nl/handle/1874/31626 en eng 0883-8305 https://dspace.library.uu.nl/handle/1874/31626 info:eu-repo/semantics/OpenAccess Aardwetenschappen Biologie Arabian Sea dinoflagelates cysts oxygen minimum zone Article 2004 ftunivutrecht 2023-07-01T23:32:04Z [1] Correlations between Arabian Sea organic carbon and GISP2 d18O records indicate a pronounced oxygen minimum zone (OMZ) during interstadials, whereas well-oxygenated conditions prevailed during stadials. Local deep winter mixing ventilated intermediate water during the coldest stadials, corresponding to North Atlantic Heinrich events. Here we show that in the Arabian Sea periods of climatic warming following Heinrich events H6–H4 and the Younger Dryas (YD) are characterized by dominant Polysphaeridium zoharyi (dinoflagellate) cysts. The finding of assemblages dominated by P. zoharyi in the open ocean is unusual because today similar assemblages are restricted to lagoonal settings. It is postulated that the highly saline mixed layer and the strong density gradient which characterized Arabian Sea hydrography after H6–H4 and the YD simulated a shallow seafloor, thereby enabling germination of cysts prior to sinking. The strong density gradient following cold stadials should have facilitated the rapid reestablishment of a pronounced OMZ during interstadials. Article in Journal/Newspaper North Atlantic Utrecht University Repository |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Aardwetenschappen Biologie Arabian Sea dinoflagelates cysts oxygen minimum zone |
spellingShingle |
Aardwetenschappen Biologie Arabian Sea dinoflagelates cysts oxygen minimum zone Reichart, G.-J. Brinkhuis, H. Huiskamp, F. Zachariasse, W.J. Hyperstratification following glacial overturning events in the northern Arabian Sea |
topic_facet |
Aardwetenschappen Biologie Arabian Sea dinoflagelates cysts oxygen minimum zone |
description |
[1] Correlations between Arabian Sea organic carbon and GISP2 d18O records indicate a pronounced oxygen minimum zone (OMZ) during interstadials, whereas well-oxygenated conditions prevailed during stadials. Local deep winter mixing ventilated intermediate water during the coldest stadials, corresponding to North Atlantic Heinrich events. Here we show that in the Arabian Sea periods of climatic warming following Heinrich events H6–H4 and the Younger Dryas (YD) are characterized by dominant Polysphaeridium zoharyi (dinoflagellate) cysts. The finding of assemblages dominated by P. zoharyi in the open ocean is unusual because today similar assemblages are restricted to lagoonal settings. It is postulated that the highly saline mixed layer and the strong density gradient which characterized Arabian Sea hydrography after H6–H4 and the YD simulated a shallow seafloor, thereby enabling germination of cysts prior to sinking. The strong density gradient following cold stadials should have facilitated the rapid reestablishment of a pronounced OMZ during interstadials. |
format |
Article in Journal/Newspaper |
author |
Reichart, G.-J. Brinkhuis, H. Huiskamp, F. Zachariasse, W.J. |
author_facet |
Reichart, G.-J. Brinkhuis, H. Huiskamp, F. Zachariasse, W.J. |
author_sort |
Reichart, G.-J. |
title |
Hyperstratification following glacial overturning events in the northern Arabian Sea |
title_short |
Hyperstratification following glacial overturning events in the northern Arabian Sea |
title_full |
Hyperstratification following glacial overturning events in the northern Arabian Sea |
title_fullStr |
Hyperstratification following glacial overturning events in the northern Arabian Sea |
title_full_unstemmed |
Hyperstratification following glacial overturning events in the northern Arabian Sea |
title_sort |
hyperstratification following glacial overturning events in the northern arabian sea |
publishDate |
2004 |
url |
https://dspace.library.uu.nl/handle/1874/31626 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
0883-8305 https://dspace.library.uu.nl/handle/1874/31626 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772185218115960832 |