Interactions between the Indonesian Throughflow and circulations in the Indian and Pacific Oceans

McCreary, Julian P.; Miyama, Toru; Furue, Ryo; Jensen, Tommy G.; Kang, Hyung-Ku; Bang, Bohyun; Qu, Tangdong

doi:10.1016/j.pocean.2007.05.004

Cited by 52 publications

(39 citation statements)

References 71 publications

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“…They suggested that the Leeuwin Current System (LCS) is part of this shallow circulation. A modelintercomparison study of three models of varying complexity supported their conclusions (McCreary et al, 2007), yet both studies were based on coarse-resolution simulations. The response of the narrow SICC and LC could therefore not be addressed.…”

Section: Introductionmentioning

confidence: 74%

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The connection of the Indonesian Throughflow, South Indian Ocean Countercurrent and the Leeuwin Current

2016

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Abstract. East of Madagascar, the shallow "South Indian Ocean Counter Current (SICC)" flows from west to east across the Indian Ocean against the direction of the winddriven circulation. The SICC impinges on west Australia and enhances the sea level slope, strengthening the alongshore coastal jet: the Leeuwin Current (LC), which flows poleward along Australia. An observed transport maximum of the LC around 22 • S can likely be attributed to this impingement of the SICC. The LC is often described as a regional coastal current that is forced by an offshore meridional density gradient or sea surface slope. However, little is known about the controls of these open-ocean gradients. The regional circulation system is embedded in the subtropical "super gyre" that connects the Indo-Pacific via the Tasman Gateway and the Indonesian passages. The Indonesian Throughflow (ITF) circulates through the Indian Ocean back into the Pacific south of Australia. This return pathway appears to be partly trapped in the upper layer north of an outcrop line. It is redirected along this outcrop line and joins the eastward flow of the SICC. To study the connection of the basin-scale and the inter-oceanscale dynamics, we apply both an ocean general circulation model and a conceptual two-layer model. Shutdown of the ITF in the models leads to a large decrease in Leeuwin Current transport. Most of the SICC was found to then reconnect to the internal gyre circulation in the Indian Ocean. ITF, SICC and LC thus appear to be dynamically connected.

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Section: Introductionmentioning

confidence: 74%

“…The viscous regime may be compared to coarse simulations from previous studies (Hirst and Godfrey, 1993;McCreary et al, 2007). Along the lateral boundaries we applied no-slip conditions.…”

Section: Conceptual Model: Hallberg Isopycnal Modelmentioning

confidence: 99%

The connection of the Indonesian Throughflow, South Indian Ocean Countercurrent and the Leeuwin Current

2016

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“…This type of vertical structure is believed to be due to the low-order baroclinic modes, which tend to cancel the barotropic response at depth [42]. The vertical profile of the meridional velocity is well simulated in LICOM2.0 except the slightly larger southward maximum below the surface.…”

Section: Velocitiesmentioning

confidence: 83%

Indonesian Throughflow in an eddy-resolving ocean model

et al. 2013

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The performance of the eddy-resolving LICOM2.0 in simulating the Indonesian Throughflow has been evaluated against the INSTANT data in the present study. The mean vertical structures of the along strait velocities are simulated well in LICOM2.0, but the large velocities at the bottom of the Lifamatola Passage and the Timor Passage cannot be reproduced by LICOM2.0. The causes are considered to be both the errors in the topography and the tidal mixing at the bottom. Despite several biases in the mean velocities, the mean inflow and outflow volume transports in LICOM2.0 are almost identical to the INSTANT data. Compared with the lower resolution LICOM, the most significant improvement is the better simulation of the partitions of the inflow and outflow transports in individual straits. The outflow for low-resolution LICOM is mainly through the Ombai and Lombok Strait, whereas that for LICOM2.0 is mainly through the Timor Passage. The variability of the vertical structure of velocities and the volume transport are also investigated. LICOM2.0 overestimates the magnitude of the upper-layer currents and the amplitude of the variation. We also found that the largest correlation coefficient occurs in the shallowest strait, the Lombok, whereas the lowest occurs in the Timor Passage, especially in the upper layer. The latter may be caused by the unrealistic transport through the Torres Strait in LICOM2.0.

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“…From the perspective of oceanography, this area is also believed to be unique because of the interaction between Indonesian Through Flow (ITF/Arlindo). The presence of four water masses on the western side, north and south of Sumba Island (Northern Pacific Subtropical Water-NPSW, North Pacific Intermediate Water-NPIW, Northern Indian Subtropical Water-NISW and Northern Indian Intermediate Water-NIIW), proves that this area is an outlet of ITF [24][25][26]. A front near the western tip of Sumba Island potentially trigger an eddy and might be influenced by the South Java Current (SJC) [24][25][26].…”

Section: Study Areamentioning

confidence: 99%

Microplastics in Sumba waters, East Nusa Tenggara

Cordova

Hernawan

2018

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. The accumulation of plastic debris in the oceans has been widely recognized as a threat to marine environment. A recent study estimated that Indonesia is one of the biggest sources of plastic wastes in the ocean, but directly-measured abundance data from the seawater in Indonesia is lacking. We documented the abundance and distribution of microplastics (size <5mm) in sub-surface seawaters of Sumba, a pristine region in Indonesia. Water samples were collected from 5 m, 50 m, 100 m, 300 m depth and near the sea bottom. Samples were examined for microplastics using flotation and filtration methods. We found microplastic in all sampling locations, consisting of fibers (45.45%), granules (36.36%) and other plastic form (18.18%). Most of microplastic particles were found at water depths less than 100 m (81.82%), which was the thermocline area. Our finding corroborates the believe that plastics has widely invaded marine environment in different parts of the seas and oceans, including pristine, remote, and unknown areas.

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Interactions between the Indonesian Throughflow and circulations in the Indian and Pacific Oceans

Cited by 52 publications

References 71 publications

The connection of the Indonesian Throughflow, South Indian Ocean Countercurrent and the Leeuwin Current

The connection of the Indonesian Throughflow, South Indian Ocean Countercurrent and the Leeuwin Current

Indonesian Throughflow in an eddy-resolving ocean model

Microplastics in Sumba waters, East Nusa Tenggara

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