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Seasonal and Interannual Variability of Tidal Mixing Signatures in Indonesian Seas from High-Resolution Sea Surface TemperatureWith their complex narrow passages and vigorous mixing, the Indonesian seas provide the only low-latitude pathway between the Pacific and Indian Oceans and thus play an essential role in regulating Pacific-Indian Ocean exchange, regional air-sea interaction, and ultimately, global climate phenomena. While previous investigations using remote sensing and numerical simulations strongly suggest that this mixing is tidally driven, the impacts of monsoon and El Niño Southern Oscillation (ENSO) on tidal mixing in the Indonesian seas must play an important role. Here we use high-resolution sea surface temperature from June 2002 to June 2021 to reveal monsoon and ENSO modulations of mixing. The largest spring-neap (fortnightly) signals are found to be localized in the narrow passages/straits and sills, with more vigorous tidal mixing during the southeast (boreal summer) monsoon and El Niño than that during the northwest (boreal winter monsoon) and La Niña. Therefore, tidal mixing, which necessarily responds to seasonal and interannual changes in stratification, must also play a feedback role in regulating seasonal and interannual variability of water mass transformations and Indonesian throughflow. The findings have implications for longer-term variations and changes of Pacific–Indian ocean water mass transformation, circulation, and climate.
Document ID
20220013832
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Raden Dwi Susanto ORCID
(University of Maryland, College Park College Park, Maryland, United States)
Richard D Ray
(Goddard Space Flight Center Greenbelt, Maryland, United States)
Date Acquired
September 9, 2022
Publication Date
April 16, 2022
Publication Information
Publication: Remote Sensing
Publisher: MDPI
Volume: 14
Issue: 8
Issue Publication Date: April 2, 2022
e-ISSN: 2072-4292
Subject Category
Meteorology and Climatology
Funding Number(s)
WBS: 833099.04.01.01.03
CONTRACT_GRANT: 80NSSC18K0777
Distribution Limits
Public
Copyright
Portions of document may include copyright protected material.
Technical Review
External Peer Committee
Keywords
Indonesian seas
Tidal mixing
Spring-neap tide
Fortnightly
Indonesian throughflow
Monsoon
ENSO
Indian Ocean Dipole
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