A5075515776- Atmospheric chemistry and aerosols
- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Isotope Analysis in Ecology
- Methane Hydrates and Related Phenomena
- Toxic Organic Pollutants Impact
- Oil Spill Detection and Mitigation
- Coastal wetland ecosystem dynamics
- Microbial Community Ecology and Physiology
- Atmospheric aerosols and clouds
- Geology and Paleoclimatology Research
- Air Quality and Health Impacts
- Ocean Acidification Effects and Responses
- Thermal and Kinetic Analysis
- Botany and Plant Ecology Studies
- Marine and fisheries research
- Marine Biology and Ecology Research
- Soil and Water Nutrient Dynamics
- Air Quality Monitoring and Forecasting
- Fish Ecology and Management Studies
- Mercury impact and mitigation studies
- Advanced Chemical Sensor Technologies
- Medicinal Plant Pharmacodynamics Research
- Graphite, nuclear technology, radiation studies
University of Delaware
2018-2024
College of Marin
2024
DuPont (United States)
2023
Old Dominion University
2011-2021
William & Mary
2008-2015
Virginia Institute of Marine Science
2008-2011
University of Rhode Island
2006
Abstract. Despite the acknowledged relevance of aerosol-derived water-soluble organic carbon (WSOC) to climate and biogeochemical cycling, characterization aerosol WSOC has been limited. Electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS) was utilized in this study provide detailed molecular level high weight (HMW; m/z>223) component collected from rural sites Virginia New York, USA. More than 3000 peaks were detected by ESI MS within a m/z...
This study describes a method for evaluating the reproducibility of replicate mass spectra acquired complex natural organic matter (NOM) samples analyzed by electrospray ionization Fourier transform ion cyclotron resonance spectrometry, with regard to both peak detection and magnitude. Because studies NOM characterization utilize not only emergence disappearance peaks but also changes in relative magnitude, it is important establish that differences between are significantly larger than...
Though pyrogenic carbon (pyC) has been assumed to be predominantly stable, degradation and transfers of pyC between various pools have found influence its cycling longevity in the environment. Dissolution via leaching may main control on loss processes such as microbial or abiotic oxidation, mineral sorption, export aquatic systems. Yet, little is known controls dissolved organic matter (pyDOM) generation composition. Here, yield composition pyDOM generated through batch a thermal series oak...
Abstract Pyrogenic dissolved organic matter (pyDOM) is known to be an important biogeochemical constituent of aquatic ecosystems and the carbon cycle. While recent studies have examined how pyDOM production, composition, photolability varies with parent pyrogenic solid material type, we lack understanding potential microbial mineralization transformation in biogeosphere. Thus, leachates oak, charred at 400 °C 650 °C, as well their photodegraded counterparts were incubated a soil‐extracted...
Abstract. The chemical composition of organic aerosols in the atmosphere is strongly influenced by human emissions. effect these have on environment, health, and climate change determined molecular nature species. complexity aerosol samples limits ability to study composition, therefore associated properties impacts they have. Many studies addressed water-soluble fraction had much success identifying specific formulas for thousands compounds present. However, little attention given...
Abstract. The molecular characteristics of aerosol organic matter (OM) determines to a large extent its impacts on the atmospheric radiative budget and ecosystem function in terrestrial aquatic environments, yet OM details aerosols from different sources are not well established. Aerosol particulate samples with North American-influenced, African-influenced, marine (minimal recent continental influence) air mass back trajectories were collected as part 2011 trans-North Atlantic US GEOTRACES...
The impact of sea spray aerosols on global climate remains one the most uncertain components aerosol–radiation–climate problem, but has received less attention than impacts terrestrial and anthropogenic aerosols. last decade produced a large body information regarding sources composition marine aerosols, resulting in reassessment complex role that particles play various geophysical phenomena. As aerosol contributes substantially to preindustrial, natural background which provides baseline...
Abstract Many challenges remain before we can fully understand the multifaceted role that natural organic matter (NOM) plays in soil and aquatic systems. These despite considerable progress has been made understanding NOM’s properties reactivity using latest analytical techniques. For nearly 4 decades, International Humic Substances Society (IHSS, which is a non-profit scientific society) distributed standard substances adhere to strict isolation protocols reference materials are collected...
Carbon isotopic signatures ( δ 13 C, Δ 14 C) of aerosol particulate matter total organic carbon (TOC) and operationally defined (OC) components were measured in samples from two background sites the eastern U.S. TOC water‐soluble OC (WSOC) C values (−27 to −24‰) indicated predominantly terrestrial 3 plant fossil derived sources. Total solvent extracts (TSE) their aliphatic, aromatic, polar depleted (−30 −26‰) relative WSOC. TSE (−476 +25‰) suggest variable contributions (∼5–50%) these...
Abstract. With the increased occurrence of wildfires around world, interest in chemistry pyrogenic organic matter (pyOM) and its fate environment has increased. Upon leaching from soils by rain events, significant amounts dissolved pyOM (pyDOM) enter aquatic interact with microbial communities that are essential for cycling within different biogeochemical cycles. To evaluate biodegradability pyDOM, aqueous extracts laboratory-produced biochars were incubated soil microbes, molecular changes...
Abstract Tidal salt marshes produce and emit CH 4 . Therefore, it is critical to understand the biogeochemical controls that regulate spatial temporal dynamics in wetlands. The prevailing paradigm assumes acetoclastic methanogenesis dominant pathway for production, higher salinity concentrations inhibit production marshes. Recent evidence shows produced within via methylotrophic methanogenesis, a process not inhibited by sulfate reduction. To further explore this conundrum, we performed...
Organic aerosols (OA) are universally regarded as an important component of the atmosphere that have far-ranging impacts on climate forcing and human health. Many these related to OA molecular characteristics. Despite acknowledged importance, current uncertainties source apportionment properties environmental make it difficult confidently predict net OA. Here we evaluate specific compounds well bulk structural total suspended particulates in ambient collected from key emission sources...