A5037663515- Groundwater and Isotope Geochemistry
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Marine and coastal ecosystems
- Arctic and Antarctic ice dynamics
- Isotope Analysis in Ecology
- Radioactive contamination and transfer
- Oceanographic and Atmospheric Processes
- Marine Biology and Ecology Research
- Atmospheric and Environmental Gas Dynamics
- Geochemistry and Elemental Analysis
- Radioactivity and Radon Measurements
- Groundwater flow and contamination studies
- Climate change and permafrost
- Karst Systems and Hydrogeology
- Cryospheric studies and observations
- Geochemistry and Geologic Mapping
- Radioactive element chemistry and processing
- Microbial Community Ecology and Physiology
- Hydrocarbon exploration and reservoir analysis
- Marine and environmental studies
- Geological Studies and Exploration
- Heavy metals in environment
- Mercury impact and mitigation studies
- Ocean Acidification Effects and Responses
Woods Hole Oceanographic Institution
2016-2025
University of South Carolina
2017
Scripps Institution of Oceanography
2013
City University of New York
2009
The Graduate Center, CUNY
2009
Lamont-Doherty Earth Observatory
2009
International University of Monaco
2008
East Carolina University
2006
Wake Research
2006
University of Rhode Island
1997-1999
The GEOTRACES Intermediate Data Product 2017 (IDP2017) is the second publicly available data product of international programme, and contains measured quality controlled before end 2016. IDP2017 includes from Atlantic, Pacific, Arctic, Southern Indian oceans, with about twice volume previous IDP2014. For first time, for a large suite biogeochemical parameters as well aerosol rain characterising atmospheric trace element isotope (TEI) sources. TEI in are by careful assessment intercalibration...
Abstract Along the continental margins, rivers and submarine groundwater supply nutrients, trace elements, radionuclides to coastal ocean, supporting ecosystems and, increasingly, causing harmful algal blooms eutrophication. While global magnitude of gauged riverine water discharge is well known, (SGD) poorly constrained. Using an inverse model combined with a compilation 228 Ra observations, we show that SGD integrated over Atlantic Indo‐Pacific Oceans between 60°S 70°N (12 ± 3) × 10 13 m 3...
Abstract. The element silicon (Si) is required for the growth of silicified organisms in marine environments, such as diatoms. These consume vast amounts Si together with N, P, and C, connecting biogeochemical cycles these elements. Thus, understanding cycle ocean critical wider issues carbon sequestration by ocean's biological pump. In this review, we show that recent advances process studies indicate total inputs outputs, to from world ocean, are 57 % 37 higher, respectively, than previous...
Abstract A major surface circulation feature of the Arctic Ocean is Transpolar Drift (TPD), a current that transports river‐influenced shelf water from Laptev and East Siberian Seas toward center basin Fram Strait. In 2015, international GEOTRACES program included high‐resolution pan‐Arctic survey carbon, nutrients, suite trace elements isotopes (TEIs). The cruises bisected TPD at two locations in central basin, which were defined by maxima meteoric dissolved organic carbon concentrations...
Submarine groundwater discharge (SGD) is now recognized as an important process of the hydrological cycle worldwide and plays a major role conveyor dissolved compounds to ocean. Naturally occurring radium isotopes (223Ra, 224Ra, 226Ra 228Ra) are widely employed geochemical tracers in marine environments. Whilst Ra were initially predominantly applied study open ocean processes fluxes across continental margins, their most common application environment has undoubtedly become identification...
Sediment cores from the intertidal zone of Waquoit Bay (Cape Cod, Massachusetts) yielded iron oxide‐coated sands in subterranean estuary, which underlies head bay. The oxides were dark red, yellow and orange colors are formed by oxidation ferrous iron‐rich groundwater near groundwater‐seawater interface. Within these oxide‐rich sediments, concentration combined amorphous crystalline forms ranged between 2500 4100 ppm Fe. These concentrations 4–6 times greater than surface sands, 10–15 more...
Because of rapid increases in population, anthropogenic sources nitrogen have adversely impacted the water quality coastal ponds on Cape Cod. A major source "new" to these estuaries is groundwater, which intercepts septic tank fields its flow path coastline. Many attempts been made quantify this process; however, groundwater discharge often patchy nature and therefore difficult study by use traditional techniques such as seepage meters. In Waquoit Bay, MA, we tested an approach based radium,...
An unresolved issue in ocean and climate sciences is whether changes to the surface input of micronutrient iron can alter flux carbon deep ocean. During Southern Ocean Iron Experiment, we measured an increase particulate from mixed layer, as well particle cycling below iron-fertilized patch. The was similar magnitude that natural blooms thus small relative global budgets proposed geoengineering plans sequester atmospheric dioxide sea.
To investigate the role of seepage zone in transport, chemical speciation, and attenuation nitrogen loads carried by submarine groundwater discharge, we collected nearshore samples (n = 328) examined distribution isotopic signature (δ 15 N) nitrate ammonium. In addition, estimated nutrient fluxes from terrestrial marine sources. We discuss our results context three aquifer zones: a fresh zone, shallow salinity transition (STZ), deep STZ. Groundwater plumes containing ammonium occurred...
Author Posting. © Oceanography Society, 2010. This article is posted here by permission of Society for personal use, not redistribution. The definitive version was published in 23, no. 2 (2010): 112-114.