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

Alford, Matthew H.; Gregg, Michael C.; Ilyas, Muhammad

doi:10.1029/1999gl002337

Cited by 44 publications

(48 citation statements)

References 14 publications

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“…It has long been unclear why microstructure measurements in the central Banda Sea by Alford et al [1999] were so inconsistent with the idea of significant tidal mixing at that location. It has long been unclear why microstructure measurements in the central Banda Sea by Alford et al [1999] were so inconsistent with the idea of significant tidal mixing at that location.…”

Section: Resultsmentioning

confidence: 99%

Tidal mixing signatures in the Indonesian seas from high‐resolution sea surface temperature data

Ray

Susanto

2016

Geophysical Research Letters

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The presence of significant tidal mixing in the Indonesian seas is well established from both observations and numerical modeling. One indicator is a clear spring‐neap cycle in satellite sea surface temperature (SST) measurements, as first shown by Ffield and Gordon. Their early results are here updated with SST data of considerably higher spatial and temporal resolution. The largest fortnightly signals are found to be localized to relatively small straits, channels, and sills, while the deep basin of the Banda Sea displays little significant signal. A broader region of somewhat enhanced signal surrounds the Seram Sea. The high resolution of the modern SST data is especially critical for mapping the complex fortnightly signals that arise in, and especially south of, the major straits of the Lesser Sunda Island chain.

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Section: Resultsmentioning

confidence: 99%

Tidal mixing signatures in the Indonesian seas from high‐resolution sea surface temperature data

Ray

Susanto

2016

Geophysical Research Letters

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“…Republication, systemmatic reproduction, or collective redistirbution of any portion of this article by photocopy machine, reposting, or other means is permitted only with the approval of Th e Oceanography Society. Send all correspondence to: info@tos.org or Th e Oceanography Society, PO Box 1931, Rockville, MD 20849-1931 mixing inferred from these stratifi cation changes in the water column are high, on the order of 1 x 10 -4 m 2 s -1 Ffi eld and Gordon, 1996). In con El Niño La Niña Indonesian Seas Temperature Figure 2.…”

mentioning

confidence: 99%

Indonesian Seas Finestructure Variability

Ffield¹,

Robertson²

2005

oceanog

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“…However, to attain GM spectral equivalent to the surface spectra level, N would have to be ∼100 cph, which is unrealistically high for the ocean. N values of 20 cph have been observed in the region, but not 100 cph (Alford et al 1999). In regions of internal wave generation, spectra are not expected to follow the GM spectra, since an imbalance exists between energy input and dissipation.…”

Section: Interactions Between the Tidal Frequencies And The High Freqmentioning

confidence: 80%

“…In regions II and IV below the upper ocean, the integrated spectral levels agree with the integrated GM spectra levels. Upper ocean integrated spectral levels are quite high, roughly corresponding to GM spectra for N=20 cph, which has been observed in the region (Alford et al 1999). Inclusion of the tidal bands artificially increases the integrated spectral levels above GM.…”

Section: Interactions Between the Tidal Frequencies And The High Freqmentioning

confidence: 83%

Interactions between tides and other frequencies in the Indonesian seas

Robertson

2010

Ocean Dynamics

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Interactions of tidal constituents and the transfer of energy from the tidal frequencies to other frequencies are investigated using 3-D tidal simulations for the Indonesian seas, focusing on an area of active internal tides. Semidiurnal tides strongly affect diurnal tides; however, semidiurnal tides are essentially unaffected by diurnal tides. The semidiurnal and diurnal constituents interact with each other through non-linear interference, both destructive and constructive. Semidiurnal tides generate harmonics at nearly the diurnal frequency and higher vertical wavenumbers. In Ombai Strait, these harmonics are out of phase with the diurnal tides and interact destructively with the diurnal tides, effectively negating the diurnal response in some locations. However, this is not a general response, and interactions differ between locations. Energy is also transferred from both semidiurnal and diurnal tides to other frequencies across the spectrum, with more energy originating from semidiurnal tides. These energy transfers are not homogeneous, and the spectral responses differ between the Makassar and Ombai Straits, with the region east of Ombai showing a more active surface response compared to a more intense benthic response in Makassar. In deep water away from topography, velocity spectra generally follow the Garrett-Munk (GM) relation. However, in areas of internal tide generation, spectral density levels exceed GM levels, particularly between 4 and 8 cycles per day (cpd), indicating increased non-linear interactions and energy transfer through resonant interactions. The model indicates strong surface trapping of internal tides, with surface velocity spectra having significantly higher energy between 4 and 8 cpd even 100 km away from the prominent sill generating the internal tides.

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

Abstract: [1996] models (Kp _> i x 10 -4 m2s -•). 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.

Cited by 44 publications

References 14 publications

Tidal mixing signatures in the Indonesian seas from high‐resolution sea surface temperature data

Tidal mixing signatures in the Indonesian seas from high‐resolution sea surface temperature data

Indonesian Seas Finestructure Variability

Interactions between tides and other frequencies in the Indonesian seas

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