A5083183267- Marine and coastal ecosystems
- Isotope Analysis in Ecology
- Mercury impact and mitigation studies
- Marine Biology and Ecology Research
- Ocean Acidification Effects and Responses
- Geochemistry and Elemental Analysis
- Geochemistry and Geologic Mapping
- Radioactive element chemistry and processing
- Heavy metals in environment
- Oceanographic and Atmospheric Processes
- Geology and Paleoclimatology Research
University of Southern California
2020-2023
Abstract The distributions of iodate (IO 3 − ), iodide (I nitrite (NO 2 and oxygen (O ) were determined on two zonal transects one meridional transect in the Eastern Tropical North Pacific (ETNP) 2018. Iodine is a useful tracer situ redox transformations inputs within water column from continental margins. In oxygenated waters, iodine predominantly present as oxidized iodate. deficient zone (ODZ) ETNP, substantial fraction reduced to iodide, with highest concentrations coincident secondary...
Abstract The distributions of iodate and iodide were measured along the GEOTRACES GP15 meridional transect at 152°W from shelf Alaska to Papeete, Tahiti. included oxygenated waters near Alaska, full water column in central basin North Pacific Basin, upper spanning across seasonally mixed regimes north, oligotrophic gyre, equatorial upwelling. Iodide concentrations are highest permanently stratified tropical layers, which reflect accumulation due light‐dependent biological processes, decline...
Abstract Oceanic oxygen deficient zones (ODZs) influence global biogeochemical cycles in a variety of ways, most notably by acting as sink for fixed nitrogen (Codispoti et al. 2001). Optimum multiparameter analysis data from two cruises the Eastern Tropical North Pacific (ETNP) was implemented to develop water mass large ODZ this region. This reveals that pronounced conditions are within 13°C (13CW) mass, which is distributed via subsurface mesoscale features such eddies branching California...
Abstract The chemistry of copper (Cu) in seawater is well known to be dominated by complexation with organic ligands. prevailing paradigm that Cu forms strong but labile complexes. Recently, a novel procedure revealed only small fraction dissolved exists as majority present relatively inert on timescales weeks or more and probably does not participate coordination exchange reactions, including biologically mediated processes. Samples collected from the 2018 GEOTRACES GP15 cruise show...
Abstract Oxygen‐deficient zones (ODZs) play an important role in the distribution and cycling of trace metals ocean, as sources including Fe Mn, also possible sinks chalcophile elements such Cd. The Eastern Tropical North Pacific (ETNP) ODZ is one three largest ODZs worldwide. Here, we present results from two sectional surveys through ETNP conducted 2018, providing high‐resolution concentrations several metals, along with complimentary measurements nutrients iodine speciation. We show that...