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Sea surface temperature changes during May and August in the western Arabian Sea over the last 22 kyr: Implications as to shifting of the upwelling season
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
2011 (English)In: Marine Micropaleontology, ISSN 0377-8398, E-ISSN 1872-6186, Vol. 78, no 1-2, 25-29 p.Article in journal (Refereed) Published
Abstract [en]

In the western Arabian Sea (WAS), the highest seasonal sea surface temperature (SST) difference presently occurs between May and August In order to gain an understanding on how monsoonal upwelling modulates the SST difference between these two months, we have computed SST for the months of May and August based on census counts of planktonic foraminifers by using the artificial neural network (ANN) technique. The SST difference between May and August exhibits three distinct phases: i) a moderate SST difference in the late Holocene (0-3.5 ka) is attributable to intense upwelling during August, ii) a minimum SST difference from 4 to 12 ka is due to weak upwelling during the month of August, and iii) the highest SST difference during the last glacial interval (19 to 22 ka) with high Globigerina bulloides % could have been caused by the occurrence of a prolonged upwelling season (from May through July) and maximum difference in the incoming solar radiation between May and August. Overall, variations in the SST difference between May and August show that the timing of intense upwelling in the Western Arabian Sea over the last 22 kyr has been variable over the months of June, July and August.

Place, publisher, year, edition, pages
2011. Vol. 78, no 1-2, 25-29 p.
Keyword [en]
Indian Ocean, Monsoon, Upwelling, Sea surface temperature
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-149005DOI: 10.1016/j.marmicro.2010.09.006ISI: 000287460100003OAI: oai:DiVA.org:uu-149005DiVA: diva2:403612
Available from: 2011-03-14 Created: 2011-03-14 Last updated: 2017-12-11Bibliographically approved

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