Program and Agenda

Abstract

DISTRIBUTION OF TRANSPARENT EXOPOLYMER PARTICLES IN THE EASTERN TROPICAL SOUTH PACIFIC

Important for the carbon export to the Deep Sea, Transparent Exopolymer Particles (TEP) also serve as nutritional substrate and attachment surfaces for bacteria, supporting biological oxygen consumption. Spatial distribution of TEP in the Eastern South Pacific Ocean (ESP), an area influenced by a highly productive upwelling system and underlying extensive Oxygen Minimum Zone (OMZ), is largely unknown. In attempt to recognize how TEP stocks are affected by complex biogeochemistry of ESP and vice versa, we determined TEP distribution in the ESP (12°-14°S, 76°-79°W) during the Meteor 93 cruise (February - March 2013). Highest TEP concentrations (>1900µgXeq/l) were observed close to the coast, coinciding with upwelling of nutrient-rich waters. Generally TEP accumulated in the oxygenated photic layer and correlated significantly with chlorophyll-a-fluorescence (r=0.7, n=323, P<0.05). At the upper boundary the OMZ (70 m), TEP concentrations were moderate (<80µgXeq/l), slightly attenuating toward its lower border (<60µgXeq/l; 500m depth). The role of TEP for organic matter cycling in the ESP and their potential influence on oxygen and carbon fluxes in the OMZ are discussed.

ePoster: http://www.eposters.net/pdfs/distribution-of-transparent-exopolymer-particles-in-the-eastern-tropical-south-pacific.pdf

Authors

Loginova, A. N., Geomar, Germany, aloginova@geomar.de

Roa, J., Geomar, Germany, jroa@geomar.de

Kanzow, T., Geomar, Germany, tkanzow@geomar.de

Engel, A., Geomar, Germany, aengel@geomar.de

Details

Poster presentation

Session #:084
Date: 2/25/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: Yes

PosterID: 125