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Dynamics of ocean surface mixed layer variability in the Indian Ocean


Schiller, A and Oke, PR, Dynamics of ocean surface mixed layer variability in the Indian Ocean, Journal of Geophysical Research: Oceans, 120, (6) pp. 4162-4186. ISSN 2169-9275 (2015) [Refereed Article]

DOI: doi:10.1002/2014JC010538


We present a new methodology that allows quantifying the impact of individual terms of the temperature and salinity conservation within the mixed layer on mixed layer depth (MLD). The method is applied to output from an ocean general circulation model in the Indian Ocean to investigate variability and changes in MLD. On seasonal timescales and for most areas of the Indian Ocean variability of MLD is tightly linked to all thermohaline budget terms. In the Indian Ocean at approximately 20S the MLD covaries with surface heat and freshwater fluxes on intraseasonal and interannual timescales. The geography of the region includes the Leeuwin Current, plus the tropical eastern Indian Ocean for interannual surface freshwater fluxes. The range of seasonal amplitudes of MLD variability varies with individual budget terms but is typically within 1m/month to 100m/month. The ocean footprints of an intraseasonal tropical cyclone, tropical and midlatitude seasonal temperature and salinity budgets and interannual variability associated with the Indian Ocean Dipole Mode are analyzed. The results reveal close relationships of the thermohaline budgets within the mixed layer with the variability of the MLD. The associated tendencies of changes in MLD are consistent with Argo and satellite-based observations of tendencies within the mixed layer and sea-surface temperature and salinity.

Item Details

Item Type:Refereed Article
Keywords:Indian Ocean, ocean surface, mixed layer variability, ocean general circulation model
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Oceanic processes (excl. in the Antarctic and Southern Ocean)
UTAS Author:Schiller, A (Dr Andreas Schiller)
UTAS Author:Oke, PR (Dr Peter Oke)
ID Code:118483
Year Published:2015
Web of Science® Times Cited:17
Deposited By:Directorate
Deposited On:2017-07-12
Last Modified:2017-08-09

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