Remotely sensed spatial and temporal variability of the Leeuwin Current using MODIS data

Huang, Zhi; Feng, Ming

doi:10.1016/j.rse.2015.05.028

Cited by 30 publications

(34 citation statements)

References 59 publications

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“…It shows a clear, annual period, with the strongest (weakest) LC during May (October). The LC also tends to be wider when it is stronger (not shown), consistent with Huang and Feng's (2015) finding from satellite sea surface temperature (SST) data that the high SST region associated with the LC is wider when the LC is stronger. The vertical extent of the LC does not vary much in time and does not seem to have a systematic annual cycle (not shown).…”

Section: ) Vertical Structuresupporting

confidence: 85%

On the Leeuwin Current System and Its Linkage to Zonal Flows in the South Indian Ocean as Inferred from a Gridded Hydrography

Furue

Guerreiro

Phillips

et al. 2017

Journal of Physical Oceanography

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The Leeuwin Current System (LCS) along the coast of Western Australia consists of the poleward-flowing Leeuwin Current (LC), the equatorward-flowing Leeuwin Undercurrent (LUC), and neighboring flows in the south Indian Ocean (SIO). Using geostrophic currents obtained from a highly resolved ( 1 /88) hydrographic climatology [CSIRO Atlas of Regional Seas (CARS)], this study describes the spatial structure and annual variability of the LC, LUC, and SIO zonal currents, estimates their transports, and identifies linkages among them. In CARS, the LC is supplied partly by water from the tropics (an annual mean of 0.3 Sv; 1 Sv [ 10 6 m 3 s 21 ) but mostly by shallow (&200 m) eastward flows in the SIO (4.7 Sv), and it loses water by downwelling across the bottom of this layer (3.4 Sv). The downwelling is so strong that, despite the large SIO inflow, the horizontal transport of the LC does not much increase to the south (from 0.3 Sv at 228S to 1.5 Sv at 348S). This LC transport is significantly smaller than previously reported. The LUC is supplied by water from south of Australia (0.2 Sv), by eastward inflow from the SIO south of 288S (1.6 Sv), and by the downwelling from the LC (1.6 Sv) and in response strengthens northward, reaching a maximum near 288S (3.4 Sv). North of 288S it loses water by outflow into subsurface westward flow (23.6 Sv between 288 and 228S) and despite an additional downwelling from the LC (1.9 Sv), it decreases to the north (1.7 Sv at 228S). The seasonality of the LUC is described for the first time.

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Section: ) Vertical Structuresupporting

confidence: 85%

On the Leeuwin Current System and Its Linkage to Zonal Flows in the South Indian Ocean as Inferred from a Gridded Hydrography

Furue

Guerreiro

Phillips

et al. 2017

Journal of Physical Oceanography

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“…More details can be found for instance in Feng et al (). The maximum core velocity of the LC is estimated to be ∼1 m/s (Meuleners et al, ) and the inshore edge's mean distance to the coastline of the LC varies seasonally and inter‐annually between ∼21 and 86 km (Huang & Feng, ). Cresswell and Golding () reported eddies that originated from the LC propagating with velocities about 7 km/day.…”

Section: Discussionmentioning

confidence: 99%

“…The LWEs used in this study are hereafter referred to as LWE1 (18–27 May 2014) and LWE2 (1 November to 10 November 2014). Similarly, two LC scenarios (LC1 and LC2 respectively) that were representative of the fully developed LC system as described in the literature (Huang & Feng, ; Meuleners et al, ; Pearce & Griffiths, ; Waite et al, ), were identified from the ROMS simulations.…”

Section: Methodsmentioning

confidence: 99%

The Effect of the Leeuwin Current on Offshore Surface Gravity Waves in Southwest Western Australia

et al. 2017

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The knowledge of regional wave regimes is critical for coastal zone planning, protection, and management. In this study, the influence of the offshore current regime on surface gravity waves on the southwest Western Australian (SWWA) continental shelf was examined. This was achieved by coupling the three dimensional, free surface, terrain‐following hydrodynamic Regional Ocean Modelling System (ROMS) and the third generation wave model Simulating WAves Nearshore (SWAN) using the Coupled Ocean‐Atmosphere‐WaveSediment Transport (COAWST) model. Different representative states of the Leeuwin Current (LC), a strong pole‐ward flowing boundary current with a persistent eddy field along the SWWA shelf edge were simulated and used to investigate their influence on different large wave events. The coupled wave‐current simulations were compared to wave only simulations, which represented scenarios in the absence of a background current field. Results showed that the LC and the eddy field significantly impact SWWA waves. Significant wave heights increased (decreased) when currents were opposing (aligning with) the incoming wave directions. During a fully developed LC system significant wave heights were altered by up to ±25% and wave directions by up to ±20°. The change in wave direction indicates that the LC may modify nearshore wave dynamics and consequently alter sediment patterns. Operational regional wave forecasts and hindcasts may give flawed predictions if wave‐current interaction is not properly accounted for.

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“…The more productive regions of Australia's EEZ include the northern continental shelves along the Gulf of Carpentaria and around to the Kimberley (Rothlisberg et al 1994). However, chlorophylla (Chl-a) concentrations estimated from satellites can be locally increased due to the migration of eddies, and these concentrations are generally higher than surrounding waters in autumn and winter (Huang and Feng 2015). In the regions of relatively high surface Chl-a, nitrate levels are typically zero (Thompson et al 2011b).…”

Section: Oceanographymentioning

confidence: 99%

Baseline biogeochemical data from Australia's continental margin links seabed sediments to water column characteristics

Radke

Nicholas

Thompson

et al. 2017

Mar. Freshwater Res.

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Abstract. Surficial marine sediments are an important source of nutrients for productivity and biodiversity, yet the biogeochemistry of these sediments is poorly known in Australia. Seabed samples were collected at .350 locations in Australia's western, northern and eastern continental margins during Federal Government surveys . Parameters analysed included measures of organic matter (OM) source (d 13 C, d 15 N and C : N ratios), concentration (percentage total organic carbon, %TOC, and surface area-normalised TOC, OC : SA) and bioavailability (chlorin indices, total reactive chlorins, total oxygen uptake, total sediment metabolism (TSM), sediment oxygen demand (SOD) and SOD and TSM normalised against TOC). The aim of the present study was to summarise these biogeochemical 'baseline' data and make contextualised inferences about processes that govern the observed concentrations. The OM was primarily from marine sources and the OC : SA broadly reflected water column productivity (based on Moderate Resolution Imaging Spectroradiometer, MODIS). Approximately 40% of sediments were organic poor by global standards, reflecting seawater oligotrophy; ,12% were organic rich due to benthic production, high water column productivity and pockmark formation. OM freshness varied due to pigment degradation in water columns and dilution with refractory OM in reworked sediments. d 15 N values confirmed the importance of N 2 fixation to Timor Sea productivity, and point to recycling of fixed nitrogen within food chains in Western Australia.

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Remotely sensed spatial and temporal variability of the Leeuwin Current using MODIS data

Cited by 30 publications

References 59 publications

On the Leeuwin Current System and Its Linkage to Zonal Flows in the South Indian Ocean as Inferred from a Gridded Hydrography

On the Leeuwin Current System and Its Linkage to Zonal Flows in the South Indian Ocean as Inferred from a Gridded Hydrography

The Effect of the Leeuwin Current on Offshore Surface Gravity Waves in Southwest Western Australia

Baseline biogeochemical data from Australia's continental margin links seabed sediments to water column characteristics

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