Tidal Mixing Signatures in the Indonesian Seas

Ffield, Amy; Gordon, Arnold L.

doi:10.1175/1520-0485(1996)026<1924:tmsiti>2.0.co;2

Cited by 193 publications

(143 citation statements)

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“…Tidal analysis of the Indonesian waters has focused on the eastern Indonesian Seas (e.g. Schiller 2004;Hatayama et al 1996;Ffield and Gordon 1996), due to their importance in the global circulation of water. Several modelling studies address the tide in the Singapore Strait (e.g.…”

Section: Earlier Tidal Studiesmentioning

confidence: 99%

Sensitivity analysis of the tidal representation in Singapore Regional Waters in a data assimilation environment

et al. 2011

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The Singapore Regional Waters (SRW) is one of the more complex tidal regions in the world. This complexity is caused by various factors including the interaction of the Indian and Pacific oceans with their mainly semi-diurnal and diurnal tide, respectively, complicated coastline geometry, small islands and sharply varying bottom topography. Tidal data analysis is hampered by the lack of reliable coastal stations with long-term water level records while numerical tidal modelling studies suffer from lack of accurate highresolution bathymetry data and uncertainty in the prescription of the tidal open boundary forcing. The present study combines numerical modelling with available along-track satellite altimetry data and a limited set of reliable coastal stations. It proposes a structured approach to study the sensitivity of tidal propagation and interactions to parameters like the prescription of tidal forcing at the open ocean boundaries, local depth information and seabed roughness. To guide and facilitate this analysis, the open-source software environment OpenDA for sensitivity analysis and simultaneous parameter optimisation is used. In a user-controlled way, the vector difference error in tidal representation could so effectively be reduced by~50%. The results confirm the benefit of using OpenDA in guiding the systematic exploration of the modelled tide and reducing the parameter uncertainties in different parts of the SRW region. OpenDA is also shown to reduce the repetitive nature of simultaneous parameter variation. Finally, the behaviour of the tide in the region and its sensitivities to changes in tidal boundary forcing and to local depth and friction variation in the narrow regions of the Malacca Strait is now much better understood. With most of the systematic errors reduced in the numerical model as a result of the sensitivity analysis, it is expected that the model can be applied to study tide-surge interaction and is much better suited for later application in combination with data assimilation techniques such as Kalman filtering for which systematic model errors should be minimal.

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Section: Earlier Tidal Studiesmentioning

confidence: 99%

Sensitivity analysis of the tidal representation in Singapore Regional Waters in a data assimilation environment

et al. 2011

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“…The characteristic salinity maximum, near 100-150 m, of Pacific water flowing into the Indian Ocean through the Indonesian Archipelago is completely erased by the time it reaches the Banda Sea [Ffield and Gordon, 1992 Since this value is a measure of vertical mixing integrated along the flow path, these models do not resolve the issue of whether the mixing occurs at sills and boundaries, or in basin interiors. Lack of knowledge of the throughflow path (e.g., Godfrey [1996]) introduces additional uncertainty.…”

Section: Introductionmentioning

confidence: 99%

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

Alford¹,

Gregg²,

Ilyas³

1999

Geophysical Research Letters

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“…This is caused not only by monsoonal windinduced upwelling, but also by very strong tidal forces (Ffield and Gordon 1996;Gordon et al 1997;Gordon 2005;Koch-Larrouy et al 2008), especially along some of the narrow straits between several islands. As a consequence, these phenomena induce isohaline profiles as documented by Sprintall et al (2014) which affect seaair interactions and atmospheric convection to very high altitudes (see also Jochum and Potemra 2008).…”

Section: Water Masses Mixing During the Throughflowmentioning

confidence: 99%

The Indo-Pacific Warm Pool: critical to world oceanography and world climate

De Deckker

2016

Geosci. Lett.

126

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The Indo-Pacific Warm Pool holds a unique place on the globe. It is a large area [>30 × 10 6 km 2 ] that is characterised by permanent surface temperature >28 °C and is therefore called the 'heat engine' of the globe. High convective clouds which can reach altitudes up to 15 km generate much latent heat in the process of convection and this area is therefore called the 'steam engine' of the world. Seasonal and contrasting monsoonal activity over the region is the cause for a broad seasonal change of surface salinities, and since the area lies along the path of the Great Ocean Conveyor Belt, it is coined the 'dilution' basin due to the high incidence of tropical rain and, away from the equator, tropical cyclones contribute to a significant drop in sea water salinity. Discussion about what may happen in the future of the Warm Pool under global warming is presented together with a description of the Warm Pool during the past, such as the Last Glacial Maximum when sea levels had dropped by ~125 m. A call for urgent monitoring of the IPWP area is justified on the grounds of the significance of this area for global oceanographic and climatological processes, but also because of the concerned threats to human population living there.

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Tidal Mixing Signatures in the Indonesian Seas

Cited by 193 publications

References 0 publications

Sensitivity analysis of the tidal representation in Singapore Regional Waters in a data assimilation environment

Sensitivity analysis of the tidal representation in Singapore Regional Waters in a data assimilation environment

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

The Indo-Pacific Warm Pool: critical to world oceanography and world climate

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