Related Topics: Climate Change Research

Climate Change Research Products in the Science Inventory

Records 1 to 25 of 344

Integrating multimedia models to assess nitrogen losses from the Mississippi River basin to the Gulf of Mexico (JOURNAL)
This study describes and implements an integrated, multimedia, process-based system-level approach to estimating nitrogen (N) fate and transport in large river basins. The modeling system includes: 1) Community Multi-Scale Air Quality (CMAQ); 2) Water Research and Forecasting (WR...
Experimental and model estimates of the contributions from biogenic monoterpenes and sesquiterpenes to secondary organic aerosol in the southeastern United States (JOURNAL)
Atmospheric organic aerosol (OA) has important impacts on climate and human health but its sources remain poorly understood. Biogenic monoterpenes and sesquiterpenes are important precursors of secondary organic aerosol (SOA), but the amounts and pathways of SOA generation from t...
Examining WRF’s Sensitivity to Contemporary Land-Use Datasets across the Contiguous United States Using Dynamical Downscaling (JOURNAL)
Land use (LU) representation plays a critical role in simulating air-surface interactions that affect meteorology and regional climate. In the Noah LSM within the WRF model, LU categories are used to set the radiative properties of the surface and to influence exchanges of heat, ...
The potential effects of climate change on air quality across the conterminous US at 2030 under three Representative Concentration Pathways (JOURNAL)
The potential impacts of climate change on regional ozone (O3) and fine particulate (PM2.5) air quality in the United States are investigated by downscaling Community Earth System Model (CESM) global climate simulations with the Weather Research and Forecasting (WRF) model, then ...
Occupancy modeling species–environment relationships with non‐ignorable survey designs (JOURNAL)
Statistical models supporting inferences about species occurrence patterns in relation to environmental gradients are fundamental to ecology and conservation biology. A common implicit assumption is that the sampling design is ignorable and does not need to be formally accounted ...
Improved soil temperature modeling using spatially explicit solar energy drivers (JOURNAL)
Modeling the spatial and temporal dynamics of soil temperature is deterministically complex due to the wide variability of several influential environmental variables, including soil column composition, soil moisture, air temperature, and solar energy. Landscape incident solar ra...
Developing a Model-based Drinking Water Decision Support System Featuring Remote Sensing and Fast Learning Techniques (JOURNAL)
Timely adjustment of operating strategies in drinking water treatment in response to water quality variations of both natural and anthropogenic causes is a grand technical challenge. One essential approach is to develop and apply integrated sensing, monitoring, and modeling techn...
Nitrogen inputs drive nitrogen concentrations in U.S. streams and rivers during summer low flow conditions (JOURNAL)
Ecological and human health impairments related to excess nitrogen (N) remain widespread in U.S. streams and rivers despite recent efforts to reduce N loading. Many studies have quantified the relationship between N inputs to watersheds and stream N export in terms of mass loads....
A Maieutic Exploration of Nudging Strategies for Regional Climate Applications Using the WRF Model (JOURNAL)
The use of nudging in the Weather Research and Forecasting (WRF) Model to constrain regional climate downscaling simulations is gaining in popularity because it can reduce error and improve consistency with the driving data. While some attention has been paid to whether nudging i...
Adding to the Toolbox for Tidal-Inundation Mapping in Estuarine Areas (JOURNAL)
In estuaries, land-surface and tidal elevation conspire to influence the amount of salt-water inundation in a specific location, ultimately affecting the distribution of estuary vegetation. Plants vary in their tolerances to salinity and inundation. Understanding even small chang...
Isoprene Emission Response to Drought and the Impact on Global Atmospheric Chemistry (JOURNAL)
Biogenic isoprene emissions play a very important role in atmospheric chemistry. They are strongly dependent on various environmental conditions, such as temperature, solar radiation, plant water stress, ambient ozone and CO2 concentrations, and soil moisture. Current biogenic ...
Connectivity of streams and wetlands to downstream waters: an integrated systems framework (JOURNAL)
Interest in connectivity has increased in the aquatic sciences, partly because of its relevance to the Clean Water Act. This paper has two objectives: (1) Provide a framework to understand hydrological, chemical, and biological connectivity, focusing on how headwater streams and ...
Modeling and Validation of 48V Mild Hybrid Lithium-ion Battery Pack (JOURNAL)
As part of the Midterm Evaluation of the 2017-2025 Light-duty Vehicle Greenhouse Gas (GHG) Standards, the U.S. Environmental Protection Agency (EPA) developed simulation models for studying the effectiveness of 48V mild hybrid technology for reducing CO2 emissions from light-duty...
Predictive GT-Power Simulation for VNT Matching on a 1.6 L Turbocharged GDI Engine (JOURNAL)
The thermal efficiency benefits of low-pressure (LP) exhaust gas recirculation (EGR) in spark-ignition engine combustion are well known. One of the greatest barriers facing adoption of LP-EGR for high power-density applications is the challenge of boosting. Variable nozzle turbin...
Modeling and Controls Development of 48V Mild Hybrid Electric Vehicles (JOURNAL)
The Advanced Light-Duty Powertrain and Hybrid Analysis tool (ALPHA) was created by EPA to evaluate the Greenhouse Gas (GHG) emissions of Light-Duty (LD) vehicles. It is a physics-based, forward-looking, full vehicle computer simulator capable of analyzing various vehicle types c...
Key Issues for Seamless Integrated Chemistry–Meteorology Modeling (JOURNAL)
Online coupled meteorology–atmospheric chemistry models have greatly evolved in recent years. Although mainly developed by the air quality modeling community, these integrated models are also of interest for numerical weather prediction and climate modeling, as they can con...
A framework for expanding aqueous chemistry in the Community Multiscale Air Quality (CMAQ) model version 5.1 (JOURNAL)
This paper describes the development and implementation of an extendable aqueous-phase chemistry option (AQCHEM − KMT(I)) for the Community Multiscale Air Quality (CMAQ) modeling system, version 5.1. Here, the Kinetic PreProcessor (KPP), version 2.2.3, is used to generate a Rosen...
Characterizing the impact of projected changes in climate and air quality on human exposures to ozone (JOURNAL)
The impact of climate change on human and environmental health is of critical concern. Population exposures to air pollutants both indoors and outdoors are influenced by a wide range of air quality, meteorological, behavioral, and housing-related factors, many of which are also i...
The effectiveness of Light Rail transit in achieving regional CO2 emissions targets is linked to building energy use: insights from system dynamics modeling (JOURNAL)
Cities worldwide face the challenges of accommodating a growing population, while reducing emissions to meet climate mitigation targets. Public transit investments are often proposed as a way to curb emissions while maintaining healthy urban economies. However, cities face a syst...
Comparison of Five Modeling Approaches to Quantify and Estimate the Effect of Clouds on the Radiation Amplification Factor (RAF) for Solar Ultraviolet Radiation (JOURNAL)
A generally accepted value for the Radiation Amplification Factor (RAF), with respect to the erythemal action spectrum for sunburn of human skin, is −1.1, indicating that a 1.0% increase in stratospheric ozone leads to a 1.1% decrease in the biologically damaging UV radiation in ...
Nitrate radicals and biogenic volatile organic compounds: oxidation, mechanisms, and organic aerosol (JOURNAL)
Oxidation of biogenic volatile organic compounds (BVOC) by the nitrate radical (NO3) represents one of the important interactions between anthropogenic emissions related to combustion and natural emissions from the biosphere. This interaction has been recognized for more than 3 d...
Chemical transport model simulations of organic aerosol in southern California: model evaluation and gasoline and diesel source contributions (JOURNAL)
Gasoline- and diesel-fueled engines are ubiquitous sources of air pollution in urban environments. They emit both primary particulate matter and precursor gases that react to form secondary particulate matter in the atmosphere. In this work, we updated the organic aerosol module ...
Semivolatile POA and parameterized total combustion SOA in CMAQv5.2: impacts on source strength and partitioning (JOURNAL)
Mounting evidence from field and laboratory observations coupled with atmospheric model analyses shows that primary combustion emissions of organic compounds dynamically partition between the vapor and particulate phases, especially as near-source emissions dilute and cool to amb...
The Lake-Catchment (LakeCat) Dataset: Characterizing landscape features for lake basins within the conterminous USA (JOURNAL)
Natural and human-related landscape features influence the ecology and water quality within lakes. It is critical, therefore, to quantify landscape features in a hydrologically meaningful way to effectively manage these important ecosystems. Such summaries of the landscape are of...
Light absorption of secondary organic aerosol: Composition and contribution of nitro-aromatic compounds (JOURNAL)
Secondary organic aerosol (SOA) might affect the atmospheric radiation balance through absorbing light at shorter visible and UV wavelengths. However, the composition and optical properties of light-absorbing SOA is poorly understood. In this work, SOA filter samples were collect...