Distribution of transparent exopolymer particles in the easter tropical south Pacific.

Loginova, Alexandra , Roa, J., Thomsen, Sören , Kanzow, Torsten and Engel, Anja (2014) Distribution of transparent exopolymer particles in the easter tropical south Pacific. [Poster] In: Ocean Sciences Meeting 2014. , 23.-28.02.2014, Honululu, Hawaii, USA .

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Abstract

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.

Document Type: Conference or Workshop Item (Poster)
Research affiliation: OceanRep > SFB 754 > B9
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
OceanRep > SFB 754
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Projects: SFB754
Expeditions/Models/Experiments:
Date Deposited: 10 Mar 2014 13:52
Last Modified: 16 Dec 2014 10:13
URI: http://oceanrep.geomar.de/id/eprint/23738

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