CT34A:
Sources and Sinks of Reactive Oxygen Species in the Ocean: "Is seawater a radical solution?" (Zafiriou, 1987) Revisited Posters
CT34A:
Sources and Sinks of Reactive Oxygen Species in the Ocean: "Is seawater a radical solution?" (Zafiriou, 1987) Revisited Posters
Sources and Sinks of Reactive Oxygen Species in the Ocean: "Is seawater a radical solution?" (Zafiriou, 1987) Revisited Posters
Session ID#: 9594
Session Description:
The formation of reactive oxygen species (ROS; e.g. H2O2, O2−, OH, and 1O2) via photochemical reactions has long been known to be ubiquitous in marine waters. These species help poise the chemical redox state of the ocean and can have mixed impacts on marine macro- and micro-organisms. Surprisingly, good, basic in situ measurements are still lacking for all ROS but H2O2. Recent reports of ROS production by healthy and diverse microbes, particularly superoxide and hydrogen peroxide, create new questions as to the relative role of photochemistry and biology in ROS cycles and complicate assumptions about production pathways. In addition, new studies challenge the assumption that ROS are simply a suite of detrimental metabolic byproducts, and call for a re-examination of the impacts, feedbacks, and physiological role(s) of ROS in living systems. In the end, the magnitude and relative importance of abiotic and biotic ROS sources and sinks in the ocean remain poorly understood. This session seeks contributions covering all ROS sources, sinks, mechanistic processes and distributions in marine systems. Integrative studies that quantify ROS dynamics and impacts are particularly encouraged.
Primary Chair: Leanne Powers, Skidaway Institute of Oceanography, Savannah, GA, United States
Chairs: Colleen M Hansel, Woods Hole Oceanographic Institution, Department of Marine Chemistry and Geochemistry, Woods Hole, MA, United States, William L Miller, National Science Foundation, Arlington, VA, United States; University of Georgia, Marine Science, Athens, GA, United States and Julia M Diaz, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Skidaway Institute of Oceanography, Savannah, GA, United States
Moderators: Leanne Powers, Skidaway Institute of Oceanography, Savannah, GA, United States, William L Miller, National Science Foundation, Arlington, VA, United States; University of Georgia, Marine Science, Athens, GA, United States and Colleen M Hansel, Woods Hole Oceanographic Institution, Department of Marine Chemistry and Geochemistry, Woods Hole, MA, United States
Student Paper Review Liaison: Leanne Powers, Skidaway Institute of Oceanography, Savannah, GA, United States
Index Terms:
4805 Biogeochemical cycles, processes, and modeling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4840 Microbiology and microbial ecology [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4855 Phytoplankton [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4875 Trace elements [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
Co-Sponsor(s):
- MM - Microbiology and Molecular Biology
Abstracts Submitted to this Session:
Paradoxical Effects of Seawater Temperature and Solar Irradiance on the Photo-degradation State of Senescent Phytoplankton. (89589)
Molecular probe measurements of photochemical production of one-electron reducing intermediates from chromophore dissolved organic matter: relation to O2- and H2O2 production (92298)
Relating the Photochemical Production of Superoxide and Hydrogen Peroxide to the Photooxidation of Dissolved Organic Carbon in the Ocean (92317)
Detection of Non-Photochemical Superoxide in Coastal and Open Ocean Seawater: Particulate Versus Dissolved Sources (93636)
See more of: Chemical Tracers, DOM and Trace Metals