A5060370307- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Atmospheric and Environmental Gas Dynamics
- Air Quality Monitoring and Forecasting
- Marine and coastal ecosystems
- Ocean Acidification Effects and Responses
- Vehicle emissions and performance
- Maritime Transport Emissions and Efficiency
- Aeolian processes and effects
- Odor and Emission Control Technologies
- Oil Spill Detection and Mitigation
- Oceanographic and Atmospheric Processes
- Toxic Organic Pollutants Impact
- Methane Hydrates and Related Phenomena
- Climate variability and models
- Arctic and Antarctic ice dynamics
- Meteorological Phenomena and Simulations
- Water Quality and Resources Studies
- Spectroscopy and Laser Applications
- Groundwater and Isotope Geochemistry
- Lung Cancer Treatments and Mutations
- Mercury impact and mitigation studies
- Isotope Analysis in Ecology
University of Washington
2014-2024
Cooperative Institute for Research in Environmental Sciences
2020-2024
Virginia Tech
2024
Carilion Clinic
2024
NOAA Pacific Marine Environmental Laboratory
2014-2023
Oregon Health & Science University
2022
National Oceanic and Atmospheric Administration
2009-2021
Seattle University
2000-2021
Scripps Institution of Oceanography
2010
University of New Hampshire
2010
An extensive set of volatile organic compounds (VOCs) and particulate matter (POM) was measured in polluted air during the New England Air Quality Study 2002. Using VOC ratios, photochemical age sampled masses estimated. This approach validated (1) by comparing observed rates at which VOCs were removed from atmosphere with expected OH oxidation, (2) emission ratios inferred data average composition urban air, (3) ability to describe increase an alkyl nitrate time terms chemical kinetics. A...
The International Global Atmospheric Chemistry Program (IGAC) has conducted a series of Aerosol Characterization Experiments (ACE) that integrate in situ measurements, satellite observations, and models to reduce the uncertainty calculations climate forcing due aerosol particles. ACE‐Asia, fourth this experiments, consisted two focused components: (1) An intensive field study sought quantify spatial vertical distribution concentrations properties, processes controlling their formation,...
Atmospheric black carbon (BC) warms Earth's climate, and its reduction has been targeted for near-term climate change mitigation. Models that include forcing by BC assume internal mixing with non-BC aerosol components enhance absorption, often a factor of ~2; such model estimates have yet to be clearly validated through atmospheric observations. Here, direct in situ measurements absorption enhancements (E(abs)) state are reported two California regions. The observed E(abs) is small-6% on...
A database of 15,617 point measurements dimethylsulfide (DMS) in surface waters along with lesser amounts data for aqueous and particulate dimethylsulfoniopropionate concentration, chlorophyll sea salinity temperature, wind speed has been assembled. The was processed to create a series climatological annual monthly 1°×1° latitude‐longitude squares data. results were compared published fields geophysical biological parameters. No significant correlation found between DMS these parameters, no...
Abstract. We combine in situ measurements of sea salt aerosols (SS) from open ocean cruises and ground-based stations together with aerosol optical depth (AOD) observations MODIS AERONET, the GEOS-Chem global chemical transport model to provide new constraints on SS emissions over world's oceans. find that using Gong (2003) source function overestimates cruise coarse mode mass concentrations by factors 2–3 at high wind speeds cold waters Southern, North Pacific Atlantic Oceans. Furthermore,...
A laboratory intercomparison of organic carbon (OC) and elemental (EC) measurements atmospheric particulate matter samples collected on quartz filters was conducted among eight participants the ACE-Asia field experiment. The took place in two stages: first round when filter during experiment were being analyzed for OC EC, second after included selected from Each participant operated ECOC analyzers same manufacturer utilized analysis protocol their measurements. precision fiber a function...
Dimethylsulfide (DMS) concentrations have been measured in over 1000 Pacific surface seawater samples during the past 4 years. The data tabulated to take into account both regional and seasonal variations concentration. area‐weighted summer winter of DMS North Ocean are 2.2 1.3 nmol/L, respectively. Wind speed, temperature, diffusivities used calculate air‐sea exchange coefficients. piston velocities 2.3 2.7 m/d, These coefficients combined with concentration yield a net ocean atmosphere...
Abstract. Several short-lived pollutants known to impact Arctic climate may be contributing the accelerated rates of warming observed in this region relative global annually averaged temperature increase. Here, we present a summary that including methane, tropospheric ozone, and aerosols. For each pollutant, provide description major sources mechanism forcing. We also first seasonally forcing corresponding response estimates focused specifically on Arctic. The calculations indicate forcings...
The southern hemisphere marine Aerosol Characterization Experiment (ACE 1) was the first of a series experiments that will quantify chemical and physical processes controlling evolution properties atmospheric aerosol relevant to radiative forcing climate. goals this process studies are reduce overall uncertainty in calculation climate by aerosols understand multiphase system sufficiently be able provide prognostic analysis future response. ACE 1, which conducted from November 15 December 14,...
Although continental-scale plumes of Asian dust and pollution reduce the amount solar radiation reaching earth's surface perturb chemistry atmosphere, our ability to quantify these effects has been limited by a lack critical observations, particularly layers above surface. Comprehensive surface, airborne, shipboard, satellite measurements aerosol chemical composition, size, optical properties, radiative impacts were performed during Pacific Regional Aerosol Characterization Experiment...
Abstract. The VAMOS1 Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx) was an international field program designed to make observations of poorly understood but critical components the coupled climate system southeast Pacific. This region is characterized by strong coastal upwelling, coolest SSTs in tropical belt, and home largest subtropical stratocumulus deck on Earth. intensive phase VOCALS-REx took place during October November 2008 constitutes a part broader CLIVAR...
During the 2006 Texas Air Quality Study/Gulf of Mexico Atmospheric Composition and Climate Study (TexAQS/GoMACCS 2006) a filter-based (Particle Soot Absorption Photometer, or PSAP) photoacoustic-based aerosol light absorption technique were deployed here data are compared. The level agreement between two techniques with ambient depended on abundance organic (OA), ratio OA to absorbing carbon (LAC) mass (R OA−LAC ) particular importance. When concentration was low methods within instrumental...
Abstract The California Research at the Nexus of Air Quality and Climate Change (CalNex) field study was conducted throughout in May, June, July 2010. organized to address issues simultaneously relevant atmospheric pollution climate change, including (1) emission inventory assessment, (2) transport dispersion, (3) chemical processing, (4) cloud‐aerosol interactions aerosol radiative effects. Measurements from networks ground sites, a research ship, tall towers, balloon‐borne ozonesondes,...
Biogenic sources contribute to cloud condensation nuclei (CCN) in the clean marine atmosphere, but few measurements exist constrain climate model simulations of their importance. The chemical composition individual atmospheric aerosol particles showed two types sulfate-containing air masses addition mass-based Estimated Salt particles. Both sulfate lack combustion tracers and correlate, for some conditions, or seawater dimethyl sulfide (DMS) concentrations, which means source was largely...
The North Atlantic Aerosols and Marine Ecosystems Study (NAAMES) is an interdisciplinary investigation to improve understanding of Earth's ocean ecosystem-aerosol-cloud system. Specific overarching science objectives for NAAMES are (1) characterize plankton ecosystem properties during primary phases the annual cycle their dependence on environmental forcings, (2) determine how these interact recreate each year conditions bloom, (3) resolve remote marine aerosols boundary layer clouds...
Abstract. Aerosol indirect radiative forcing (IRF), which characterizes how aerosols alter cloud formation and properties, is very sensitive to the preindustrial (PI) aerosol burden. Dimethyl sulfide (DMS), emitted from ocean, a dominant natural precursor of non-sea-salt sulfate in PI pristine present-day (PD) atmospheres. Here we revisit atmospheric oxidation chemistry DMS, particularly under conditions, its impact on IRF. Based previous laboratory studies, expand simplified DMS scheme used...
Results are presented from 3 years of simultaneous measurements aerosol chemical composition and light scattering absorption at Barrow, Alaska. All results reported the measurement relative humidity ≤ 40%. Reported annual cycles concentration mass, sea salt, non‐sea‐salt (nss) sulfate, methanesulfonate or MSA − , NH 4 + nss K Mg +2 Ca for submicron supermicron size ranges. Submicron SO = peak in winter early spring corresponding to arrival persistence Arctic Haze. salt displays a similar...