Summary of Abstract Submission

Abstract Submission No. IO50-04-0009PresentationPoster

POTENTIAL IMPACT OF SUB-MESOSCALE UPWELLING ON PHYTOPLANKTON PRODUCTION ALONG AN OLIGOTROPHIC BOUNDARY CURRENT

James Greenwood*1, Chaojiao Sun1, Richard Matear1, James McLaughlin1

1 CSIRO, Australia

ABSTRACT :

Using a high resolution numerical model, this work explores the role of sub-mesoscale physics on the production of phytoplankton along the course of the Leeuwin Current in the southeast Indian Ocean. Large vertical velocity is frequently observed in the model in the upper 300 m around the perimeter of current meanders and eddies. It is estimated that the upward vertical motions contribute to phytoplankton production in Leeuwin Current waters by bringing sub-surface nutrients into the euphotic zone, and also explain the patchiness of recent in-situ productivity estimates. Upwelling is stronger during the austral winter suggesting a link between biological productivity and Leeuwin Current strength.