2018
DOI: 10.20944/preprints201803.0175.v1
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Exchange Flow Variability between Hypersaline Shark Bay and the Ocean

Abstract: Abstract:In Shark Bay, a large hypersaline bay in Western Australia, longitudinal density gradients force gravitational circulation that is important for Bay-ocean exchange. Observations of vertical stratification and velocity are presented, confirming a steady nearbed dense water outflow from Shark Bay's northern Geographe Channel that persisted through all stages of the tide. Outflow velocities were 2-3 times stronger than the outflows recorded previously in Naturaliste Channel (in the west) and were more re… Show more

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Cited by 5 publications
(4 citation statements)
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“…The size and spatial boundaries of the three snapper stocks are probably largely shaped by spawning timing and location, as well as oceanography and coastal topography. The mid‐west stock is likely the larger of the two purely WA stocks because spawning grounds in the Shark Bay region are exposed to the Shark Bay Outflow (see Figure 1 ; Hetzel et al, 2018 ) and a strong Leeuwin Current (LC; Cresswell & Golding, 1980 , Godfrey & Ridgway, 1985 ), facilitating the southward transport of pelagic life stages over potentially several hundreds of kilometres (Feng et al, 2010 ). In contrast, in the south‐west, the magnitude of dispersal of PLS snapper from Cockburn Sound is probably limited because it is largely protected from shelf currents like the LC and Capes Current (see Figure 1 ; Pearce & Pattiaratchi, 1999 ).…”
Section: Discussionmentioning
confidence: 99%
“…The size and spatial boundaries of the three snapper stocks are probably largely shaped by spawning timing and location, as well as oceanography and coastal topography. The mid‐west stock is likely the larger of the two purely WA stocks because spawning grounds in the Shark Bay region are exposed to the Shark Bay Outflow (see Figure 1 ; Hetzel et al, 2018 ) and a strong Leeuwin Current (LC; Cresswell & Golding, 1980 , Godfrey & Ridgway, 1985 ), facilitating the southward transport of pelagic life stages over potentially several hundreds of kilometres (Feng et al, 2010 ). In contrast, in the south‐west, the magnitude of dispersal of PLS snapper from Cockburn Sound is probably limited because it is largely protected from shelf currents like the LC and Capes Current (see Figure 1 ; Pearce & Pattiaratchi, 1999 ).…”
Section: Discussionmentioning
confidence: 99%
“…2000 mm) which exceeds precipitation (approx. 200 mm) [37,45] maintains a steep gradient in the eastern gulf. The clear, shallow waters across most of the Bay mean that seagrass meadows are exposed to saturated light levels (greater than 3000 µmol m s −1 ), experience a large annual range in temperature, typically 17–26°C although temperatures can exceed 30°C in summer [42], and a salinity range between 35 (oceanic) and 64 psu [43].…”
Section: Methodsmentioning
confidence: 99%
“…Ocean glider data, collected during the same period, indicated the continuation of this cooler water along the seabed extending further offshore. Higher salinity water is derived from evaporation (2) Shark Bay 6,7,16 ;…”
Section: Resultsmentioning
confidence: 99%