A5078850526- Marine and coastal ecosystems
- Atmospheric chemistry and aerosols
- Air Quality Monitoring and Forecasting
- Ocean Acidification Effects and Responses
- Oil Spill Detection and Mitigation
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Water Quality Monitoring and Analysis
- Marine Biology and Ecology Research
- Odor and Emission Control Technologies
- Isotope Analysis in Ecology
- Atmospheric aerosols and clouds
- Microbial Community Ecology and Physiology
- Marine Bivalve and Aquaculture Studies
- Coral and Marine Ecosystems Studies
- Industrial Gas Emission Control
- Coastal and Marine Management
- Analytical Chemistry and Chromatography
- Oceanographic and Atmospheric Processes
- Methane Hydrates and Related Phenomena
- Arctic and Antarctic ice dynamics
- Hydrocarbon exploration and reservoir analysis
- Microplastics and Plastic Pollution
- Toxic Organic Pollutants Impact
- Fluid Dynamics and Mixing
SUNY College of Environmental Science and Forestry
2015-2024
State University of New York
2015-2024
York University
2015-2024
Syracuse University
2014
Purchase College
1994-2014
Old Dominion University
2002
Woods Hole Oceanographic Institution
1989-1992
University of Miami
1986-1991
University of Delaware
1983-1985
College of Marin
1983-1985
A new approach for parameterizing dissolved organic matter (DOM) ultraviolet‐visible absorption spectra is presented. Two distinct spectral slope regions (275‐295 nm and 350‐400 nm) within log‐transformed were used to compare DOM from contrasting water types, ranging wetlands (Great Dismal Swamp Suwannee River) photobleached oceanic (Atlantic Ocean). On the basis of size‐fractionation studies (ultrafiltration gel filtration chromatography), 275‐295‐nm region ratio these slopes ( S R ; :...
Breaking waves on the ocean surface produce bubbles that, upon bursting, inject seawater constituents into atmosphere. Nascent aerosols were generated by bubbling zero‐air through flowing within an RH‐controlled chamber deployed at Bermuda and analyzed for major chemical physical characteristics. The composition of feed was representative surrounding ocean. Relative size distributions inorganic aerosol similar to those in ambient air. Ca 2+ significantly enriched relative (median factor =...
Shipboard experiments were conducted in the equatorial Pacific Ocean to ascertain relative importance of atmospheric ventilation, biological consumption, and photolysis removal dimethylsulfide (DMS) from seawater. Comparisons made at a series sampling locations transect 12°N 140°W 12°S 135°W, as part International Global Atmospheric Chemistry project's Marine Aerosol Gas Exchange cruise February–March 1992. Turnover rate constants for DMS used compare different pathways over three depth...
Abstract. A parameterization for the size- and composition-resolved production fluxes of nascent marine aerosol was developed from prior experimental observations extrapolated to ambient conditions based on estimates air entrainment by breaking wind-driven ocean waves. Production particulate organic carbon (OCaer) parameterized Langmuir equilibrium-type association matter bubble plumes in seawater resulting as constrained measurements produced productive oligotrophic seawater. This novel...
ABSTRACT This study addresses how humic substance (HS) chemical composition and photoreactivity affect bacterial growth, respiration, growth efficiency (BGE) in lake water. Aqueous solutions of HSs from diverse aquatic environments representing different dissolved organic matter sources (autochthonous allochthonous) were exposed to artificial solar UV radiation. These added water passed through a 0.7-μm-pore-size filter (containing grazer-free bacteria) followed by dark incubation for 5, 43,...
Apparent quantum yields and rates of dimethylsulfide (DMS) photolysis were determined from Sargasso Sea seawater with the goal assessing extent to which photoreactions affect unusually elevated upper ocean concentrations DMS during summer, so‐called summer paradox. monochromatic radiation decrease exponentially increasing wavelength indicate that is driven by ultraviolet (UV) radiation. The relative spectral partitioning differs between samples collected surface mixed layer (15 m)...
Phytoplankton blooms in the Arctic marginal ice zone (MIZ) can be prolific dimethylsulfide (DMS) producers, thereby influencing regional aerosol formation and cloud radiative forcing. Here we describe distribution of DMS its precursor dimethylsulfoniopropionate (DMSP) across Baffin Bay receding edge early summer 2016. Overall, total DMSP (DMSPt) increased towards warmer waters Atlantic origin concurrently with more advanced ice-melt bloom stages. Relatively high DMSPt (medians 6.3 70 nM,...
Abstract We developed nitrate and nitrite actinometers to determine radiant fluxes from 290 410 nm. These are based on the reaction of photochemically generated OH radical with benzoic acid form salicylic (SA) p‐hydroxybenzoic (pHBA). Actinom‐eter development included determination temperature wavelength dependence quantum yield for formation SA pHBA photolysis in air‐saturated solutions. Quantum yields (at 25°C) production ranged 0.00146 0.00418 between 350 nm, 0.00185 0.00633 405 The were...
Estimates of the DMS sea‐air transfer velocity ( k ) derived from direct flux measurements are poorly modeled by parameterizations based solely on wind speed and Schmidt number. CO 2 show to be a stronger function than . The NOAA/COARE gas parameterization, incorporating bubble‐mediated theory Woolf (1997), appears do better job reproducing observations for both gases, illustrating importance trace solubility in exchange. development physical principles is still its infancy, but recent...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of carbon-centered radicals in aqueous solution by liquid chromatography with fluorescence detectionDavid J. Kieber and Neil V. BloughCite this: Anal. Chem. 1990, 62, 21, 2275–2283Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November 1990https://doi.org/10.1021/ac00220a005RIGHTS & PERMISSIONSArticle Views524Altmetric-Citations84LEARN ABOUT THESE METRICSArticle Views are the...
Dimethylsulfoxide (DMSO) is an abundant but poorly understood methylated sulfur compound in the marine environment. One potentially significant loss pathway for DMSO through its biological reduction to dimethylsulfide (DMS), which has been documented a number of organisms, most notably bacteria. Here we present first detailed study by several phytoplankton axenic cultures. Reduction was observed four algal classes, with vivo rates ranging from 0.006 1.5 µmol [L cell volume] ‐1 s at 1.0 mmol...