Serveur d'exploration sur les relations entre la France et l'Australie

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

Identifieur interne : 008726 ( Main/Exploration ); précédent : 008725; suivant : 008727

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

Auteurs : J. Anthony Koslow [États-Unis, Australie] ; Stephane Pesant [Australie, France] ; Ming Feng [Australie] ; Alan Pearce [Australie] ; Peter Fearns [Australie] ; Thomas Moore [Australie] ; Richard Matear [Australie] ; Anya Waite [Australie]

Source :

RBID : ISTEX:3F1820552EFC18E09228A009BC2977984F5FFA6D

Descripteurs français

English descriptors

Abstract

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.

Url:
DOI: 10.1029/2007JC004102


Affiliations:


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Le document en format XML

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<term>Biomass</term>
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<term>Field program</term>
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<term>Geophys</term>
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<term>Time series</term>
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<term>April</term>
<term>Atmospheric research</term>
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<term>Biomass</term>
<term>Boundary currents</term>
<term>Cape leeuwin</term>
<term>Carbon uptake</term>
<term>Chlorophyll</term>
<term>Chlorophyll concentration</term>
<term>Chlorophyll concentrations</term>
<term>Chlorophyll layer</term>
<term>Chlorophyll levels</term>
<term>Coastal lagoon</term>
<term>Continental shelf</term>
<term>Continental slope</term>
<term>Cruise</term>
<term>Csiro marine</term>
<term>Cyclonic meander</term>
<term>Deep chlorophyll</term>
<term>Depth interval</term>
<term>Distinct feature</term>
<term>Early winter</term>
<term>Eastern australia</term>
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<term>Integrative oceanography division</term>
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<term>Late april</term>
<term>Late autumn</term>
<term>Late autumn bloom</term>
<term>Late winter bloom</term>
<term>Leeuwin</term>
<term>Level anomalies</term>
<term>Light levels</term>
<term>Lobster</term>
<term>Maritime image shark</term>
<term>Naturaliste</term>
<term>Naturaliste shark</term>
<term>Nearshore station</term>
<term>Nitextm disks</term>
<term>Nitrate nitrite</term>
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<term>Nutrient</term>
<term>Observatoire oceanologique</term>
<term>Ocean color</term>
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<term>Offshore station</term>
<term>Open ocean</term>
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<term>Outer shelf</term>
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<term>Perth</term>
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<term>Primary production</term>
<term>Primary productivity</term>
<term>Principal component analysis</term>
<term>Quarterly cruises</term>
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<term>Regular stations</term>
<term>Rocks transect</term>
<term>Rocks transect stations</term>
<term>Salinity</term>
<term>Satellite data</term>
<term>Satellite observations</term>
<term>Scripps institution</term>
<term>Seasonal cycle</term>
<term>Seawifs</term>
<term>Seawifs data</term>
<term>Seawifs estimate</term>
<term>Seawifs ocean color data</term>
<term>Shark</term>
<term>Shelf</term>
<term>Shelf productivity</term>
<term>Significant trend</term>
<term>Slope stations</term>
<term>Small phytoplankton size fraction</term>
<term>Southwestern</term>
<term>Southwestern australia</term>
<term>Time series</term>
<term>Total phytoplankton biomass</term>
<term>Transect</term>
<term>Tropical source waters</term>
<term>Upper water column</term>
<term>Vertical distribution</term>
<term>Vertical temperature</term>
<term>Water column</term>
<term>Water column stratification</term>
<term>Water samples</term>
<term>West coast</term>
<term>Western australia</term>
<term>Western australia figure</term>
<term>Western boundary currents</term>
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<div type="abstract">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.</div>
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