Program and Agenda

Abstract

HIGH-RESOLUTION MODEL INDICATES MAJOR ROLE OF EQUATORIAL AND OFF-EQUATORIAL UNDERCURRENTS IN SETTING OXYGEN LEVELS IN THE EASTERN TROPICAL ATLANTIC OCEAN

Observational studies indicate an expansion of the tropical ocean's oxygen minimum zones (OMZs). Understanding the causes and projecting the future evolution is hampered by deficits in the simulation of basic OMZs features in current ocean climate models. Here we assess oxygen supply and consumption in two configurations of a coupled circulation biogeochemical model, focusing on the tropical Atlantic Ocean. While a coarse (0.5°) configuration displays the common bias of too large OMZs, the modeled oxygen distribution in an eddying (0.1°) configuration is more realistic. The improvement is traced back to a stronger oxygen supply by a more realistic equatorial current system in the high-resolution model, whereas the concurrent impact on oxygen consumption is comparatively small. The asymmetric response of supply and consumption suggests that changes in the eastward oxygen transport from the well-oxygenated western boundary region can be a factor for variations in the OMZs extension in the eastern tropical Atlantic.

ePoster:

Authors

Duteil, O., GEOMAR, Germany, oduteil@geomar.de

Schwarzkopf, F., GEOMAR, Germany, fschwarzkopf@geomar.de

Böning, C., GEOMAR, Germany, cboening@geomar.de

Oschlies, A., GEOMAR, Germany, aoschlies@geomar.de

Details

Poster presentation

Session #:058
Date: 2/25/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: 2892