Evidence of a large seasonal coastal upwelling system along the southern shelf of Australia

Details Evidence of a large seasonal coastal upwelling system along the southern shelf of Australia Evidence of a large seasonal coastal upwelling system along the southern shelf of Australia

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3109310k&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 9, CiteID L09310

Mathematics

Logic

7

Oceanography: Physical: Upper Ocean Processes, Oceanography: Physical: Fronts And Jets, Oceanography: Physical: Air/Sea Interactions (0312), Oceanography: Biological And Chemical: Ecosystems, Structure And Dynamics, Oceanography: Physical: General Or Miscellaneous

Scientific paper

We report observational existence of a large seasonal coastal upwelling system that establishes in austral summer (December-April) along Australian southern shelves. Wind-driven upwelling events occur simultaneously in three upwelling centres spanning a distance of ~800 km. During each summer period there are ~2-3 major upwelling events, each lasting ~1 week. The simultaneous, rapid response of SST to wind forcing in the upwelling centres, which display vastly different shelf widths, points to the existence of a larger-scale process that carries cold water onto the shelf prior to the upwelling season. Exploration of a major upwelling event in March 1998 shows the evolution of peak surface chlorophyll-a concentrations of >4 μg/L lagging the onset of upwelling by ~1 week. The associated (exponential) growth rate can be estimated at 0.4 d-1. Another week later we found a distinct sub-surface chlorophyll-a maximum at a depth of 50 m centred along the upwelling front. Reasons for the formation of this maximum are not fully understood.

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