A5017922347- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Vehicle emissions and performance
- Atmospheric and Environmental Gas Dynamics
- Air Quality Monitoring and Forecasting
- Soil and Water Nutrient Dynamics
- Radioactive contamination and transfer
- Diverse Educational Innovations Studies
- Industrial Gas Emission Control
- Plant Water Relations and Carbon Dynamics
- Radioactive element chemistry and processing
- Mercury impact and mitigation studies
- Isotope Analysis in Ecology
- Groundwater and Isotope Geochemistry
- Plant responses to elevated CO2
- Toxic Organic Pollutants Impact
Environmental Protection Agency
2009-2019
Colorado State University
1997
United States Geological Survey
1997
Commonwealth of Virginia
1997
National Park Service
1997
Wisconsin Department of Natural Resources
1997
In support of the first Tropospheric Ozone Assessment Report (TOAR) a relational database global surface ozone observations has been developed and populated with hourly measurement data enhanced metadata. A comprehensive suite products including standard statistics, health vegetation impact metrics, trend information, are made available through common portal web interface. These form basis TOAR analyses focusing on human health, vegetation, climate relevant issues, which part this special...
Dry deposition is a major component of total atmospheric nitrogen and thus an important source bioavailable to ecosystems. However, relative wet deposition, less known regarding the sources spatial variability dry deposition. This in part due difficulty measuring associated velocities. Passive sampling techniques offer potential for improving our understanding distribution gaseous aerosol N species, referred here as We report dual nitrate isotopic composition ( δ 15 18 O) actively collected...
Abstract. Ambient air monitoring as part of the US Environmental Protection Agency's (US EPA's) Clean Air Status and Trends Network (CASTNet) currently uses filter packs to measure weekly integrated concentrations. The EPA is interested in supplementing CASTNet with semi-continuous systems at select sites characterize atmospheric chemistry deposition nitrogen sulfur compounds higher time resolution than pack. Monitor for AeRosols GAses ambient (MARGA) measures water-soluble gases aerosols an...
Abstract. Ambient air monitoring as part of the US Environmental Protection Agency's (US EPA's) Clean Air Status and Trends Network (CASTNet) currently uses filter packs to measure weekly integrated concentrations. The EPA is interested in supplementing CASTNet with semi-continuous systems at select sites characterize atmospheric chemistry deposition nitrogen sulfur compounds higher time resolution than pack. Monitor for AeRosols GAses ambient (MARGA) measures water-soluble gases aerosols...
Total atmospheric deposition of nitrogen (N) and sulfur (S) pollutants leads to deleterious impacts on ecosystems that can include acidification, increases in harmful algal blooms (HAB), decreases forest growth, loss species diversity. Accurate long-term datasets describe spatiotemporal variations trends N S are needed support ecosystem management advance research ecological from deposition. To address this need, the total measurement-model fusion application (TDep MMF) was developed under...
The U.S. Geological Survey (USGS) is the lead agency for monitoring of atmospheric deposition in United States.The USGS supports 77 191 sites National Atmospheric Deposition Program/National Trends Network (NADP/NTN) and provides nearly one-half network operating budget.In late 1995, NADP