Diapycnal mixing in the Banda Sea: Results of the first microstructure measurements in the Indonesian throughflow

Details Diapycnal mixing in the Banda Sea: Results of the first microstructure measurements in the Indonesian throughflow Diapycnal mixing in the Banda Sea: Results of the first microstructure measurements in the Indonesian throughflow

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2741a&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 17, p. 2741-2744

Physics

9

Oceanography: Physical: Upper Ocean Processes, Oceanography: General: Water Masses, Oceanography: General: Marginal And Semienclosed Seas

Scientific paper

Models involving basin-averaged T/S properties [Ffield and Gordon, 1992; Hautala et al., 1996] and barotropic/baroclinic tidal energy conversion [Sjöberg and Stigebrandt, 1992] suggest that the Indonesia archipelago is a site of active mixing. This paper describes the first microstructure measurements made in the region. Aboard the R/V Baruna Jaya IV, we repeated 18 km legs centered on (6.5°S, 128°E), in the central Banda Sea, for two weeks during Oct/Nov 1998. With the Modular Microstructure Profiler, we gathered 519 profiles of potential temperature, salinity, potential density, pressure and kinetic energy dissipation rate. The cruisemean diapycnal diffusivity from 20-300 m is Kρ=(9.2+/-0.55)×10-6m2s-1, similar to ``open ocean'' [Garrett and Munk, 1975] values (Kρ=5.1×10-6m2s-1), and an order of magnitue below basin- and time-averaged values obtained from the Ffield and Gordon [1992] and Hautala et al. [1996] models (Kρ>=1×10-4m2s-1). Sea-surface temperature displays some evidence of a fortnightly modulation, interpreted by Ffield and Gordon [1996] as evidence for tidal mixing, but is uncorrelated with the dissipation rate just below the mixed layer.

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