Nonlinear Processes in Oceanic and Atmospheric Flows

Presentation

Horizontal dispersal and Southern Ocean blooms

Author: Edward Abraham, Dragonfly.

Names and affiliation of other authors:
Mathieu Mongin,Tom Trull
Antarctic Climate & Ecosystems Cooperative Research Centre (Australia).

Oral or poster: Oral presentation

Abstract:
Production in the Southern Ocean is limited by the availability of iron.
Southern Ocean chlorophyll concentrations are generally low. However
there are persistent blooms associated with islands, such as Kerguelen
in the southern Indian Ocean. While it is assumed that these blooms are
supported by a locally increased iron supply, the origin of the iron is
unclear. It has been suggested that enhanced vertical mixing, driven by
an interaction between the circumpolar current and the bathymetry, is
supplying the iron. In this talk, we present evidence for a contrary
point of view, that the blooms are supported by horizontal advection of
iron from the islands.
This work has been carried out in collaboration with Mathieu Mongin and Tom Trull of the Antarctic Climate & Ecosystems Cooperative Research Centre (Australia).

*Satellite images from NASA and ESA

Nonlinear Processes in Oceanic and Atmospheric Flows. July 2-4, 2008. Castro Urdiales, Cantabria, Spain.