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General Session 1: Physical oceanic processes: Dynamics and physical-biological-biogeochemical interactions |
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The Indonesian throughflow (ITF) and its impact on the Indian Ocean during the global warming slowdown period.
Tuesday 10th @ 1045-1100
Multi-function Hall
Salvienty Makarim* , College of Ocean & Earth Sciences, State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China
Zhiyu Liu, College of Ocean & Earth Sciences, State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China
Weidong Yu, First Institute of Oceanography (FIO), State Oceanic Administration (SOA), China
Xiaohai Yan, College of Ocean & Earth Sciences, State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China,and College of Earth, Ocean and Environment, University of Delaware, Newark, DE 19716, USA
Janet Sprintall, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, US
Presenter Email: smakarim2013@stu.xmu.edu.cn
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| Although the mechanisms of the global warming slowdown are still under debate, some studies have suggested that a decadal La Nina like-pattern induced decadal cooling in the Pacific Ocean that subsequently generated an increase of the Indonesian Throughflow (ITF) transport in 2004-2010. Yet how the ITF spreads through the interior of the Indian Ocean and the impact of these ITF changes on the Indian Ocean, in particular its water mass transformation and current system, are still largely unknown. To this end, we analyzed the thermohaline structure and current system at different depths in the Indian Ocean both during and just before the global warming slowdown period using the ORAS4 and ARGO dataset. A new edge of the ITF water was discovered off Sumatra, presumably through a northward deflection of ITF from Lombok Strait. The Monsoon Onset Monitoring and Social Ecology Impact (MOMSEI) and Java Upwelling Variation Observation (JUVO) observational data sets support this pathway. Finally, an isopycnal mixing method initially proposed by Du et al. (2013) was adopted to quantify the spreading of ITF water in the Indian Ocean, and determine the impact of ITF changes on the variation of the Agulhas Current, the Leeuwin Current, and the Bay of Bengal water . The technique shows that fresher salinity in the Indian Ocean during the slowdown warming period was not only contributed by stronger transport of the ITF, but also by freshening Arabian Sea water and infiltrating Antarctic Intermediate Water. |
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