A5085883480- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Radioactive contamination and transfer
- Ocean Acidification Effects and Responses
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Geology and Paleoclimatology Research
- Oceanographic and Atmospheric Processes
- Radioactivity and Radon Measurements
- Groundwater and Isotope Geochemistry
- Marine and fisheries research
- Geochemistry and Elemental Analysis
- Atmospheric and Environmental Gas Dynamics
- Environmental Toxicology and Ecotoxicology
- Marine Bivalve and Aquaculture Studies
- Arctic and Antarctic ice dynamics
- Microbial Community Ecology and Physiology
- Marine and environmental studies
- Atmospheric chemistry and aerosols
- Geological and Geophysical Studies Worldwide
- Coastal and Marine Management
- Water Quality and Pollution Assessment
- Heavy metals in environment
- Geological Modeling and Analysis
- Geological and Geochemical Analysis
Queens College, CUNY
2010-2019
City University of New York
2017-2019
The Graduate Center, CUNY
2014-2019
Stony Brook University
2003-2009
Surrey County Council
2004
Documented is an intercalibration (IC) exercise for both 210 Po and Pb in seawater aliquots distributed between up to eight international laboratories that followed individual protocols. Dissolved particulate samples were provided by GEOTRACES during two IC cruises at baseline stations the North Atlantic Pacific oceans. Included surface and/or deep dissolved each site, plus complete profiles analyzed laboratory of lead author. An unspecified solid phase standard was also with secular...
Bioaccumulation of polonium‐210 (t 1/2 = 138 d) in marine phytoplankton can introduce this naturally occurring radioisotope into food chains, where it accounts for most the radiation dose to organisms and human consumers seafood. Moreover, isotope could be useful as a tracer flux organic matter ocean surface waters. We performed laboratory experiments with eight algal species representing six divisions quantify uptake, cellular partitioning, retention 210 Po by algae. Biological uptake was...
210 Po, a naturally occurring radioisotope that is ubiquitous in seawater, especially enriched proteinaceous tissues of marine organisms and may therefore be useful as tracer organic carbon flux systems. Due part to its biomagnification food chains, Po provides the largest radiation dose any organism under natural conditions. To better understand extent which zooplankton can influence fluxes serve conduit between phytoplankton, concentrate it greatly from ambient water higher trophic levels,...
Abstract. The contributions of micro-, nano-, and picoplankton to particle export were estimated from measurements size-fractionated particulate 234Th, organic carbon, phytoplankton indicator pigments obtained during five cruises between 2010 2012 along Line P in the subarctic northeast Pacific Ocean. Sinking fluxes carbon (POC) calculated 234Th–238U disequilibria and, two cruises, measured by a sediment trap at Ocean Station Papa. POC 100 m ranged 0.65 7.95 mmol m−2 d−1, similar magnitude...
Abstract. The GEOVIDE cruise, a collaborative project within the framework of international GEOTRACES programme, was conducted along French-led section in North Atlantic Ocean (Section GA01), between 15 May and 30 June 2014. In this special issue (https://www.biogeosciences.net/special_issue900.html), results from GEOVIDE, including physical oceanography trace element isotope cyclings, are presented among 18 articles. Here, scientific context, objectives, strategy provided, with an overview...
Abstract. Vertical distributions of total and particulate polonium-210 (210Po) lead-210 (210Pb) activities in the water column were measured at 11 stations North Atlantic during GEOTRACES GA01 transect: GEOVIDE cruise May–June 2014. Total 210Po activity was on average 24 % lower than 210Pb upper 100 m, it closer to unity mesopelagic (100–1000 m). The partitioning coefficients (Kd) along transect suggest preferential association relative onto particles. prominent role small particles sorption...
Abstract. The disequilibrium between 210Po activity and 210Pb in seawater samples was determined along the GEOTRACES GA01 transect North Atlantic during GEOVIDE cruise (May–June 2014). A steady-state model used to quantify vertical export of particulate 210Po. Vertical advection incorporated into one version using time-averaged velocity, which had substantial variance. This resulted large uncertainties for flux this model, suggesting that those calculations fluxes should be with great care....