Observations of a south-flowing current in the southeastern Indian Ocean

Cresswell, GR; Golding, T. J.

doi:10.1016/0198-0149(80)90055-2

Cited by 311 publications

(141 citation statements)

References 9 publications

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“…The poleward flowing Leeuwin Current along the west coast of Australia is observed in all the months but, it shows seasonal and spatial variations. The strong flow obtained in April and July agrees with the observations by Cresswell and Golding (1980). Pearce and Cresswell (1985) found that the Leeuwin Current is strongest during southern hemisphere autumn and winter (April -August) and it is weakened by November.…”

Section: Southeast Indian Oceansupporting

confidence: 79%

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Mean and Seasonal Circulation of the South Indian Ocean Estimated by Combining Satellite Altimetry and Surface Drifter Observations

Benny¹,

Ambe²,

Mridula³

et al. 2014

Terr. Atmos. Ocean. Sci.

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The mean velocity field of south Indian Ocean has been derived by combining high resolution maps of sea level anomalies and the surface drifter data from the Global Drifter program from 1993 to 2012 with a resolution of 1/3 × 1/3 degrees in latitude and longitude. The estimated mean velocity field exhibits strong western boundary currents, zonal currents and eastern boundary currents. The Agulhas Current shows a velocity of above 1.5 m s -1 at around 35°S. The distribution of energy associated with the fluctuating motion and the mean flow illustrates that mesoscale variability are particularly relevant in the Mozambique Channel, south of Java and around 40°S. Advection of mesoscale features along the western boundary is evident in the distribution of eddy fluxes. The long-term average monthly surface velocity field exhibits large variations in surface currents. The most change is observed in the South Equatorial Current which shows spatial and temporal variations.Key words: South Indian Ocean, Circulation, Currents, Satellite altimetry, Surface drifter Citation: Benny, N. P., D. Ambe, K. R. Mridula, S. Ses, K. M. Omar, and M. R. Mahmud, 2014: Mean and seasonal circulation of the South Indian Ocean estimated by combining satellite altimetry and surface drifter observations. Terr. Atmos. Ocean. Sci., 25, 91-106, doi: 10.3319/TAO.2013.08.05.01(Oc)

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Section: Southeast Indian Oceansupporting

confidence: 79%

“…The southward transport of warm water by the Leeuwin Current is confirmed from satellite tracked drifters (Cresswell and Golding 1980) and from satellite images (Pearce and Cresswell 1985). The Leeuwin Current is embedded with warm core eddies (Morrow et al 2003) and the flow shows seasonal variations (Feng et al 2003;Benny et al 2005).…”

Section: Introductionmentioning

confidence: 82%

Mean and Seasonal Circulation of the South Indian Ocean Estimated by Combining Satellite Altimetry and Surface Drifter Observations

Benny¹,

Ambe²,

Mridula³

et al. 2014

Terr. Atmos. Ocean. Sci.

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“…We suggest that the warm-water Leeuwin Current, which influences the coastal waters of Western Australia (Cresswell & Golding 1980, Legeckis & Cresswell 1981, Maxwell & Cresswell 1981, Caputi et al 1996 from the surface to 150-300 m depth (Thompson 1987), may help to supply Western Australian reefs with symbionts that are commonly found in tropical waters fur- burn 1942, Markina 1976, Marsh 1976, Maxwell & Cresswell 1981, van der Kaars & De Deckker 2003. It has also been identified as contributing to regions of biotic diversity that exhibit characteristics of both tropical and temperate areas (Markina 1976, Maxwell & Cresswell 1981, Caputi et al 1996.…”

Section: Symbiodinium Its-2 Diversity and Novel Types In Western Austmentioning

confidence: 99%

Novel algal symbiont (Symbiodinium spp.) diversity in reef corals of Western Australia

Silverstein

Correa

LaJeunesse³

et al. 2011

Mar. Ecol. Prog. Ser.

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The identity and diversity of algal symbionts (Symbiodinium spp.) in reef corals is thought to influence to the resilience of reef ecosystems to climate change, and varies depending on coral species, environmental conditions, and biogeography. We examined these factors by surveying corals along a latitudinal gradient in Western Australia on reefs connected north to south by the warm-water Leeuwin Current. We used the internal transcribed spacer-2 (ITS-2) region of ribosomal DNA to characterize Symbiodinium communities in 19 species of reef coral (in 16 genera) from tropical Dampier (20.5°S) to temperate Dunsborough (33.5°S). We documented a high number of novel ITS-2 types in Symbiodinium clades B (1 type) and C (14 types) as well as 7 previously reported ITS-2 types in clades B, C, and D. In addition, we compared symbiont distributions with Giovanni's OBIG MODIS-Aqua satellite temperature data set and found that the putatively thermotolerant Symbiodinium ITS-2 type D1a was more frequently detected in 'chronically warm' tropical sites than at 'chronically cool' temperate sites, while clade B symbiont types showed the reverse pattern, being found in certain corals at the southernmost sites. Symbiodinium type D1a was generally most abundant at Dampier, where bleaching had occurred 1 mo prior to sampling, although some variation by host taxa was observed. The diverse and novel Symbiodinium communities documented here may be a result of (1) the variable environmental histories of the study sites, (2) the apparent genetic divergence within this genus resulting from the relative isolation of Western Australian reefs, and/or (3) the frequent transport of symbionts (in hospite or free-living) from Indo-Malay reefs to Western Australia via the Leeuwin Current. These results indicate that understudied reefs in remote and isolated areas may contain Symbiodinium diversity that has not been reported previously.

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“…First described in 1980 [Cresswell and Golding, 1980], the Leeuwin Current is driven by an alongshore pressure gradient set up by the Indonesian Throughflow between the Pacific and Indian Oceans and surface heat loss at higher latitudes [Godfrey and Ridgway, 1985;Cresswell, 1991]. A relatively narrow, shallow but intense current, the Leeuwin is limited to the upper 250 -300 m, with its core over the upper continental slope, between the shelf break and about 100 km offshore.…”

Section: Introductionmentioning

confidence: 99%

The effect of the Leeuwin Current on phytoplankton biomass and production off Southwestern Australia

et al. 2008

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[1] Unlike most eastern boundary currents, the Leeuwin Current off the west coast of Australia flows poleward and is therefore warm, nutrient-poor and suppresses upwelling. As a result, the waters off Western Australia are relatively oligotrophic. Primary productivity and concentrations of chlorophyll are particularly low in summer, when the water column is stratified and most chlorophyll is concentrated in a layer above the nutricline at approximately 100 m depth. The phytoplankton blooms in late autumn and winter, coinciding with the period of strongest Leeuwin flow. The bloom in winter is maintained by cooling and storms, which promote convective mixing of the upper water column and a shoaling of the nutricline and chlorophyll maximum layer. However, the late autumn bloom coincides with the initial intensification of the Leeuwin Current. Eddies and meanders spin up just beyond the shelf break, and Leeuwin Current water was observed at this time to destratify the water column and flood the shelf with relatively nutrient-rich water. Several potential sources for the nutrients are proposed: upwelling by the eddies and meanders as they induce cross-shelf motions; advection from the north, where the nutricline is shallower; and seasonal cooling.

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Observations of a south-flowing current in the southeastern Indian Ocean

Cited by 311 publications

References 9 publications

Mean and Seasonal Circulation of the South Indian Ocean Estimated by Combining Satellite Altimetry and Surface Drifter Observations

Mean and Seasonal Circulation of the South Indian Ocean Estimated by Combining Satellite Altimetry and Surface Drifter Observations

Novel algal symbiont (Symbiodinium spp.) diversity in reef corals of Western Australia

The effect of the Leeuwin Current on phytoplankton biomass and production off Southwestern Australia

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