A5085656949- Marine and coastal ecosystems
- Ocean Acidification Effects and Responses
- Coral and Marine Ecosystems Studies
- Atmospheric chemistry and aerosols
- Marine Biology and Ecology Research
- Water Quality Monitoring and Analysis
- Atmospheric and Environmental Gas Dynamics
- Mercury impact and mitigation studies
- Air Quality Monitoring and Forecasting
- Heavy metals in environment
- Advanced oxidation water treatment
- Polar Research and Ecology
- Atmospheric Ozone and Climate
- Analytical Chemistry and Sensors
- Marine and fisheries research
- Microplastics and Plastic Pollution
- Cryospheric studies and observations
- Marine Bivalve and Aquaculture Studies
- Marine and coastal plant biology
- Coastal and Marine Dynamics
- Atomic and Subatomic Physics Research
- Groundwater and Isotope Geochemistry
- Intravenous Infusion Technology and Safety
- Soil and Water Nutrient Dynamics
- Radioactive contamination and transfer
University of North Carolina Wilmington
2003-2024
University of Miami
2007
University of California, Irvine
2007
Université du Québec à Rimouski
2000
University of Auckland
1991-1994
Bradford Royal Infirmary
1992-1993
Abstract Physiological data and models of coral calcification indicate that corals utilize a combination seawater bicarbonate (mainly) respiratory CO 2 for calcification, not carbonate. However, number investigators are attributing observed negative effects experimental acidification by or hydrochloric acid additions to reduction in carbonate ion concentration thus aragonite saturation state. Thus, there is discrepancy between the physiological geochemical views biomineralization....
A natural planktonic assemblage from the St. Lawrence Estuary was isolated in eight 1,500‐liter outdoor meso‐cosms and subjected to combinations of fast or slow mixing regimes with solar radiation artificially enhanced ultraviolet‐B (UVB, 280–320 nm) radiation. The interdependent evolution dissolved organic carbon (DOC), absorption by chromophoric matter (CDOM), chlorophyll a (Chl ), particulate (POC), bacterial abundance mesocosms followed over 10‐d period. There net increase Chl , POC, DOC...
A series of controlled photolysis experiments using simulated sunlight was conducted in the presence and absence estuarine bottom sediments to address role sediment resuspension on dissolved organic carbon (DOC) cycling coastal waters. In 0.2-µm-filtered water samples with no added sediment, DOC concentrations decreased from 0.4 3 µmol L-1 h-1 as a result photooxidation. When addition 1-2 grams per liter were irradiated, produced at rates 150 gram dry sediment. Photoproduction resuspended...
This study presents the first comparison of riverine and rainwater dissolved organic carbon (DOC) flux to a coastal region, examination DOC bioavailability. The bioavailability from these two sources was determined because its impact on waters depends whether is labile or refractory. site, Long Bay, off North Carolina South coasts in southeastern United States, receives external Cape Fear River system rainwater. Conservative mixing estuarine DOC, consistent value for river entering Estuary...
The transport and discharge of ship ballast water has been recognized as a major vector for the introduction invasive species. Chemical oxidants, long used in drinking wastewater treatment, are alternative treatment methods control species currently being tested use on ships. One concern when ballasted vessel arrives port is adverse effects residual oxidant treated water. most common oxidants include chlorine (HOCl/OCl-), bromine (HOBr/OBr-), ozone (O3), hydrogen peroxide (H2O2), dioxide...
Significant concentrations of Fe(II) were produced upon irradiation authentic rainwater with simulated sunlight. The magnitude photoproduction was dependent on initial Fe(II), Fe(III), and hydrogen ion concentrations, more when Fe(III) H+ high low. An equation developed that accurately predicts in based Fe speciation values pH. quantum yield photochemical production rain decreased dramatically increasing wavelength decreasing energy incoming radiation the average at 265 nm approximately an...
The hurricane flux of rain and river water dissolved organic carbon (DOC) to Long Bay located on the southeastern coast United States was determined for four hurricanes that made landfall in Cape Fear region North Carolina. Riverine DOC following Fran (1996) Floyd (1999) represented one third half entire annual Bay, respectively. majority this recalcitrant not available biological consumption. high from resulted extremely precipitation amounts (in excess 50 cm) associated with subsequent...
Exposure to solar radiation substantially decreased the strong copper-complexing capacity of samples collected from organic-rich Cape Fear estuary, North Carolina. Samples exposed natural sunlight for 1-2 d experienced a loss Cu ligand (modeled at fixed K'CuL = 1013.5) ranging 15-33%, and >90% using long-term exposures under controlled conditions with Xe arc simulator light (14 summer sunlight). Pseudo firstorder rate constants photodegradation averaged 0.28 d-1 two separate simulated...
Abstract Global and local anthropogenic stressors such as climate change, acidification, overfishing, pollution are expected to shift the benthic community composition of coral reefs from dominance by calcifying organisms non‐calcifying algae. These changes could reduce ability reef ecosystems maintain positive net calcium carbonate accretion. However, relationships between calcification rates remain unclear. We performed field experiments quantify metabolic two most dominant substrate...
Melt waters cover c. 20% of the McMurdo Ice Shelf during austral summer. The streams, ponds, and lakes up to 10 4 m 2 in area occur two types terrain systems with differing morphological, chemical, biological characteristics: pinnacled ice (PI) areas sparse sediment cover, low relief, little biomass; ice-cored moraine (ICM) 10–20 cm hummocky topography 20 occasional mirabilite deposits, dense benthic cyanobacterial mats. Pond water composition is markedly different. PI melt have salinities,...
Photochemically produced Fe(II) is oxidized within hours under environmentally realistic conditions in rainwater. The diurnal variation between photochemical production and re-oxidation of observed our laboratory accurately mimics the behavior ferrous iron field studies where highest concentrations dissolved occur afternoon rain during period maximum sunlight intensity followed by gradually decreasing eventually returning to early morning pre-light values. experimental work presented here,...
By removing herbivores and promoting increases in macroalgae, overfishing is thought to indirectly cause coral disease mortality. We performed three field manipulations test the general hypothesis that subsequent alteration of reef trophic dynamics are a epizootics. Specifically, we asked whether presence macroalgae can influence within- among-colony spread rates Caribbean Yellow Band Disease Montastraea faveolata. Macroalgae were placed next infected healthy, adult small colonies measure...