Estimates of tidal mixing in the Indonesian archipelago from multidisciplinary INDOMIX in-situ data

Koch-Larrouy, Ariane; Atmadipoera, Agus S.; Beek, Pietervan; Madec, Gurvan; Aucan, Jérôme; Lyard, Florent; Grelet, Jacques; Souhaut, Marc

doi:10.1016/j.dsr.2015.09.007

Cited by 72 publications

(90 citation statements)

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“…The INDOMIX cruise (July 2010, Koch-Larrouy et al, 2015 recovers in situ measurements in one of the most energetic section for internal tides through the Halmahera Sea and the Ombaï Strait. Classical fine-scale CTD/LADCP measurements have been performed together with micro-structure measurements at five locations, two at the entrance of the Halmahera Sea (S0, S1), two in the Halmahera Sea (S2, S3), one in the Banda Sea (S4) and two (S5a/S5b) in the Ombaï Strait (Fig.…”

Section: Comparisons With Ctd From Indomix Campaignmentioning

confidence: 65%

“…However, the exact location of water mass transformations remains unclear (Koch-Larrouy et al, 2007). Different measurements of turbulent dissipation rates made during the INDOMIX 2010 cruise (Koch-Larrouy et al, 2015) could certainly help to increase our knowledge and understanding of vertical eddy diffusivity values for use in numerical models.…”

Section: Introductionmentioning

confidence: 99%

“…We compare model volume transport with transport estimates from the INSTANT campaign. Regarding the water mass transformation in the Indonesian seas, we compare T -S (temperaturesalinity) diagrams of the INDO12 simulation to the parent and to observational data such as climatology, the recent IN-DOMIX 2010 cruise (Koch-Larrouy et al, 2015) and instantaneous data in 2013. Finally, Sect.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of an operational ocean model configuration at 1/12° spatial resolution for the Indonesian seas (NEMO2.3/INDO12) – Part 1: Ocean physics

et al. 2016

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Abstract. INDO12 is a 1/12 • regional version of the NEMO physical ocean model covering the whole Indonesian EEZ (Exclusive Economic Zone). It has been developed and is now running every week in the framework of the IN-DESO (Infrastructure Development of Space Oceanography) project implemented by the Indonesian Ministry of Marine Affairs and Fisheries.The initial hydrographic conditions as well as openboundary conditions are derived from the operational global ocean forecasting system at 1/4 • operated by Mercator Océan. Atmospheric forcing fields (3-hourly ECMWF (European Centre for Medium-Range Weather Forecast) analyses) are used to force the regional model. INDO12 is also forced by tidal currents and elevations, and by the inverse barometer effect. The turbulent mixing induced by internal tides is taken into account through a specific parameterisation. In this study we evaluate the model skill through comparisons with various data sets including outputs of the parent model, climatologies, in situ temperature and salinity measurements, and satellite data. The biogeochemical model results assessment is presented in a companion paper (Gutknecht et al., 2015).The simulated and altimeter-derived Eddy Kinetic Energy fields display similar patterns and confirm that tides are a dominant forcing in the area. The volume transport of the Indonesian throughflow (ITF) is in good agreement with the INSTANT estimates while the transport through Luzon Strait is, on average, westward but probably too weak. Compared to satellite data, surface salinity and temperature fields display marked biases in the South China Sea. Significant water mass transformation occurs along the main routes of the ITF and compares well with observations. Vertical mixing is able to modify the South and North Pacific subtropical water-salinity maximum as seen in T -S diagrams.In spite of a few weaknesses, INDO12 proves to be able to provide a very realistic simulation of the ocean circulation and water mass transformation through the Indonesian Archipelago. Work is ongoing to reduce or eliminate the remaining problems in the second INDO12 version.

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Section: Comparisons With Ctd From Indomix Campaignmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of an operational ocean model configuration at 1/12° spatial resolution for the Indonesian seas (NEMO2.3/INDO12) – Part 1: Ocean physics

et al. 2016

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“…But there have been earlier intimations that that must be the case [e.g., Ffield and Robertson, 2005;Nagai and Hibiya, 2015;Koch-Larrouy et al, 2015]. Aside from the broad region surrounding the Seram Sea, where the SST signature is enhanced marginally above the general noise background, the strongest SST signatures are all very localized to narrow straits and sills where semidiurnal tidal currents are very large.…”

Section: Discussionmentioning

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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“…The ITF waters experience intensive mixing in the Indonesian Seas due to tidal mixing and air-sea exchanges before exit into the Indonesia-Australian Basin of the Indian Ocean (Ffield and Gordon 1996;Koch-Larrouy et al 2015). The ITF transport joins the South Equatorial Current in the southeast Indian Ocean.…”

Section: Sources and Pathways Of The Itf Watermentioning

confidence: 99%

The Indonesian throughflow, its variability and centennial change

et al. 2018

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The Indonesian Throughflow (ITF) is an important component of the upper cell of the global overturning circulation that provides a low-latitude pathway for warm, fresh waters from the Pacific to enter the Indian Ocean. Variability and changes of the ITF have significant impacts on Indo-Pacific oceanography and global climate. In this paper, the observed features of the ITF and its interannual to decadal variability are reviewed, and processes that influence the centennial change of the ITF under the influence of the global warming are discussed. The ITF flows across a region that comprises the intersection of two ocean waveguides-those of the equatorial Pacific and equatorial Indian Ocean. The ITF geostrophic transport is stronger during La Niñas and weaker during El Niños due to the influences through the Pacific waveguide. The Indian Ocean wind variability associated with the Indian Ocean Dipole (IOD) in many years offsets the Pacific ENSO influences on the ITF geostrophic transport during the developing and mature phases of El Niño and La Niña through the Indian Ocean waveguide, due to the co-varying IOD variability with ENSO. Decadal and multi-decadal changes of the geostrophic ITF transport have been revealed: there was a weakening change from the mid-1970s climate regime shift followed by a strengthening trend of about 1Sv every 10 year during 1984-2013. These decadal changes are mostly due to the ITF responses to decadal variations of the trade winds in the Pacific. Thus, Godfrey's Island Rule, as well as other ITF proxies, appears to be able to quantify decadal variations of the ITF. Climate models project a weakening trend of the ITF under the global warming. Both climate models and downscaled ocean model show that this ITF weakening is not directly associated with the changes of the trade winds in the Pacific into the future, and the reduction of deep upwelling in the Pacific basin is mainly responsible for the ITF weakening. There is a need to amend the Island Rule to take into account the contributions from the overturning circulation which the current ITF proxies fail to capture. The implication of a weakened ITF on the Indo-Pacific Ocean circulation still needs to be assessed.

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Estimates of tidal mixing in the Indonesian archipelago from multidisciplinary INDOMIX in-situ data

Cited by 72 publications

References 65 publications

Evaluation of an operational ocean model configuration at 1/12° spatial resolution for the Indonesian seas (NEMO2.3/INDO12) – Part 1: Ocean physics

Evaluation of an operational ocean model configuration at 1/12° spatial resolution for the Indonesian seas (NEMO2.3/INDO12) – Part 1: Ocean physics

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

The Indonesian throughflow, its variability and centennial change

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