A5010059066- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Marine and coastal ecosystems
- Arctic and Antarctic ice dynamics
- Vehicle emissions and performance
- Maritime Transport Emissions and Efficiency
- Ocean Acidification Effects and Responses
- Meteorological Phenomena and Simulations
- Aeolian processes and effects
- Climate variability and models
- Oceanographic and Atmospheric Processes
- Climate change and permafrost
- Cryospheric studies and observations
- Oil Spill Detection and Mitigation
- Methane Hydrates and Related Phenomena
- Spectroscopy and Laser Applications
- Groundwater and Isotope Geochemistry
- Toxic Organic Pollutants Impact
- Arctic and Russian Policy Studies
- Advanced Chemical Sensor Technologies
- Isotope Analysis in Ecology
NOAA Pacific Marine Environmental Laboratory
2016-2025
National Oceanic and Atmospheric Administration
2016-2025
NOAA Oceanic and Atmospheric Research
2022
Scripps Institution of Oceanography
2020
Teradata (United Kingdom)
2020
Diamond Light Source
2012
Seattle University
1988-2009
University of Washington
1992-2008
University of Hawaii System
2000-2003
Sunset Laboratory (United States)
2003
Abstract Black carbon aerosol plays a unique and important role in Earth's climate system. is type of carbonaceous material with combination physical properties. This assessment provides an evaluation black‐carbon forcing that comprehensive its inclusion all known relevant processes quantitative providing best estimates uncertainties the main terms: direct solar absorption; influence on liquid, mixed phase, ice clouds; deposition snow ice. These effects are calculated models, but when...
Every year, from December to April, anthropogenic haze spreads over most of the North Indian Ocean, and South Southeast Asia. The Ocean Experiment (INDOEX) documented this Indo‐Asian at scales ranging individual particles its contribution regional climate forcing. This study integrates multiplatform observations (satellites, aircraft, ships, surface stations, balloons) with one‐ four‐dimensional models derive aerosol forcing resulting direct, semidirect two indirect effects. consisted...
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...
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,...
Abstract. We have determined the solar spectral absorption optical depth of atmospheric aerosols for specific case studies during several field programs (three cases been reported previously; two are new results). combined airborne measurements net radiant flux density and aerosol with a detailed radiative transfer model all but one cases. The (SAFARI 2000, ACE Asia, PRIDE, TARFOX, INTEX-A) contained representing major absorbing types: pollution, biomass burning, desert dust mixtures. In...
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...
Oceans cover over two-thirds of the Earth’s surface, and particles emitted to atmosphere by waves breaking on sea surfaces provide an important contribution planetary albedo. During International Chemistry Experiment in Arctic LOwer Troposphere (ICEALOT) cruise R/V Knorr March April 2008, organic mass accounted for 15–47% submicron particle air masses sampled North Atlantic Oceans. A majority this component (0.1 - 0.4 μ m -3 ) consisted hydroxyl (including polyol other alcohol) groups...
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...
Trend analyses were performed on several indicators of Arctic haze using data from sites located in the North American, Norwegian, Finnish and Russian for spring months March April. Concentrations nonseasalt (nss) SO4 = Canadian, Norwegian found to have decreased by 30–70% early 1990s present. The magnitude decrease depended location. trend nss at Barrow, Alaska 1997 present, is unclear. Measurements Barrow light scattering aerosols show a about 50% between 1980s mid-1990s both Restricting...
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...
The paper presents the current status of Maritime Aerosol Network (MAN), which has been developed as a component Robotic (AERONET). MAN deploys Microtops handheld Sun photometers and utilizes calibration procedure data processing (Version 2) traceable to AERONET. A web site dedicated activity is described. brief historical perspective given aerosol optical depth (AOD) measurements over oceans. short summary existing data, collected on board ships opportunity during NASA Sensor...
Trend analyses were performed on several indicators of Arctic haze using data from sites located in the North American, Norwegian, Finnish and Russian for spring months March April. Concentrations nonseasalt (nss) SO 4 = Canadian, Norwegian found to have decreased by 30–70% early 1990s present. The magnitude decrease depended location. trend nss at Barrow, Alaska 1997 present, is unclear. Measurements Barrow light scattering aerosols show a about 50% between 1980s mid-1990s both Restricting...
Abstract. Aerosol variations and trends over different land ocean regions from 1980 to 2009 are analyzed with the Goddard Chemistry Radiation Transport (GOCART) model observations multiple satellite sensors available ground-based networks. Excluding time periods large volcanic influence, aerosol optical depth (AOD) surface concentration polluted generally vary anthropogenic emissions, but magnitude of this association can be dampened by presence natural aerosols, especially dust. Over...
Abstract. We present an overview of the background, scientific goals, and execution Aerosol, Radiation, Cloud Processes affecting Arctic Climate (ARCPAC) project April 2008. then summarize airborne measurements, made in troposphere Alaskan Arctic, aerosol particle size distributions, composition, optical properties discuss sources transport aerosols. The data were grouped into four categories based on gas-phase composition. First, background contained a relatively diffuse, sulfate-rich...
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,...