Examination of key processes involved in the biochemical cycling of managenese in the ocean.

Heller, Maija, Wuttig, Kathrin and Croot, Peter (2012) Examination of key processes involved in the biochemical cycling of managenese in the ocean. [Talk] In: Ocean Sciences Meeting 2012. , 20.-24.02.2012, Salt Lake City, USA .

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Abstract

Mn is biologically important for phytoplankton as it is critical for many redox enyzmes required for photosynthesis, in particular in Photosystem II where it converts water to oxygen. Many marine organisms also utilize Mn as the metal centre in superoxide dismutase (SOD). SODs are essential for intracellular defences against reactive oxygen species (ROS) like superoxide. In oxygenated seawater soluble Mn(II) is slowly oxidized (biotic or chemically) to insoluble MnO2 which precipitates out of the water column. In the sunlit ocean, ROS can reduce MnO2 back to Mn(II) introducing a redox cycle. Recent work suggests that Mn(III), which is a transient intermediate between Mn(II) and MnO2 may play an important role in both, the Mn and Fe biogeochemical cycles, however until now it is unidentified how and if this species is stabilised in the ocean. Here we will present data for Mn concentrations, speciation and its kinetic reactivity with ROS from two research cruises (M83-1 and MSM17-04) in the Tropical Atlantic. In this presentation we examine the current evidence for Mn(III) in the euphotic zone of the open ocean.

Document Type: Conference or Workshop Item (Talk)
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Date Deposited: 14 Dec 2012 09:32
Last Modified: 14 Dec 2012 09:32
URI: http://oceanrep.geomar.de/id/eprint/19789

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