Related Topics: Climate Change Research

Climate Change Research Products in the Science Inventory

Records 1 to 25 of 154

Seasonality of nitrogen balances in a Mediterranean climate watershed, Oregon, US (JOURNAL)
We constructed a seasonal nitrogen (N) budget for the year 2008 in the Calapooia River Watershed (CRW), an agriculturally dominated tributary of the Willamette River (Oregon, U.S.) under Mediterranean climate. Synthetic fertilizer application to agricultural land (dominated by gr...
Polyploidy influences plant–environment interactions in quaking aspen (Populus tremuloides Michx.) (JOURNAL)
Quaking aspen (Populus tremuloides Michx.), a widespread and keystone tree species in North America, experienced heat and drought stress in the years 2002 and 2003 in the southwestern United States. This led to widespread aspen mortality that has altered the composition of forest...
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...
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....
Use of Functional Gene Expression and Respirometry to Study Wastewater Nitrification Activity after Exposure to Low Doses of Copper (JOURNAL)
Biological nitrogen removal (BNR) is performed by autotrophic nitrification, which has been shown to be sensitive to the presence of heavy metals in wastewater treatment plants (WWTPs). In this research, the effect of copper on the relative expression of functional genes involved...
Microbial ecoenzyme stoichiometry, nutrient limitation, and organic matter decomposition in wetlands of the conterminous United States (JOURNAL)
We analyzed microbial respiration and ecoenzyme activities related to microbial carbon, nitrogen, phosphorus, and sulfur acquisition in more than 900 freshwater and estuarine wetlands across the continental US as part of the US EPA Office of Water’s 2011 National Wetland Conditio...
13C isotopic signature and C concentration of soil density fractions illustrate reduced C allocation to subalpine grassland soil under high atmospheric N deposition (JOURNAL)
We followed soil C fluxes in a subalpine grassland system exposed to experimentally increased atmospheric N deposition for 7 years. Earlier we found that, different from the plant productivity response, the bulk soil C stock increase was highest at the medium, not the high N inpu...
Long-term evaluation of air sensor technology under ambient conditions in Denver, Colorado (JOURNAL)
Air pollution sensors are quickly proliferating for use in a wide variety of applications, with a low price point that supports use in high-density networks, citizen science, and individual consumer use. This emerging technology motivates the assessment under real-world condition...
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 ...
Application of Climate Assessment Tool (CAT) to Estimate Climate Variability Impacts on Nutrient Loading from Local Watersheds (JOURNAL)
A vast amount of future climate scenario datasets, created by climate models such as general circulation models (GCMs), have been used in conjunction with watershed models to project future climate variability impact on hydrological processes and water quality. However, these low...
Tale of two storms: Impact of extreme rain events on the biogeochemistry of Lake Superior (JOURNAL)
Climate change is expected to profoundly affect the Great Lakes region of North America. An increase in intensity and frequency of rain events is anticipated to deliver more runoff and to increase riverine inputs to Lake Superior's ecosystem. The effects of these changes on key b...
pH dependent octanol–water partitioning coefficients of microcystin congeners (JOURNAL)
Hazardous algal blooms can generate toxic compounds with significant health impacts for exposed communities. The ubiquitous class of algal toxins known as microcystins exhibits significant heterogeneity in its peptide structure, which has been minimally studied, given the signifi...
The Southeast Atmosphere Studies (SAS): coordinated investigation and discovery to answer critical questions about fundamental atmospheric processes (JOURNAL)
The Southeast Atmosphere Studies (SAS), encompassing the Southern Oxidant and Aerosol Study (SOAS), the Southeast Nexus of Air Quality and Climate (SENEX) study, the Nitrogen, Oxidants, Mercury and Aerosols: Distributions, Sources and Sinks (NOMADSS) study deployed in the field f...
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...
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...
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...
Influence of infrastructure on water quality and greenhouse gasdynamics in urban streams (JOURNAL)
Streams and rivers are significant sources of nitrous oxide (N2O), carbon dioxide (CO2), and methane (CH4), and watershed management can alter greenhouse gas emissions from streams. GHG emissions from streams in agricultural watersheds have been investigated in numerous studies,...
Global Water Clarity: Continuing a Century-Long Monitoring (JOURNAL)
Aquatic systems worldwide are changing due to increasing climate variability and human activities, yet it is difficult to capture such temporal changes without standardized long-term observations [Boyce et al. 2015, Barton et al. 2016]. Unlike the well-established Keeling curve t...
Seasonal Oxygen Dynamics in a Warm Temperate Estuary: Effects of Hydrologic Variability on Measurements of Primary Production, Respiration, and Net Metabolism (JOURNAL)
Seasonal responses in estuarine metabolism (primary production, respiration, and net metabolism) were examined using two complementary approaches. Total ecosystem metabolism rates were calculated from dissolved oxygen time series using Odum’s open water method. Water column rates...
Monoterpenes are the largest source of summertime organic aerosol in the southeastern United States (JOURNAL)
The chemical complexity of atmospheric organic aerosol (OA) has caused substantial uncertainties in understanding its origins and environmental impacts. Here, we provide constraints on OA origins through compositional characterization with molecular-level details. Our results sug...
Examining the impacts of increased corn production on groundwater quality using a coupled modeling system (JOURNAL)
This study demonstrates the value of a coupled chemical transport modeling system for investigating groundwater nitrate contamination responses associated with nitrogen (N) fertilizer application and increased corn production. The coupled Community Multiscale Air Quality Bidirect...
Land use, climate, and water resources – global stages of interaction (JOURNAL)
Land use and climate change can accelerate the depletion of freshwater resources that support humans and ecosystem services on a global scale. Here, we briefly review studies from around the world, including those in this special issue. We identify stages, which characterize i...
Universal industrial sectors integrated solutions modulefor the pulp and paper industry (JOURNAL)
The U.S. is the world’s second-leading producer of pulp and paper products after China. While the pulp and paper industry has reduced its environmental impacts, concerns remain regarding the emissions of oxides of nitrogen (NOX) and sulfur dioxide (SO2) from the sector. Boilers, ...
Mutagenicity and Oxidative Damage Induced by an Organic Extract of the Particulate Emissions from a Simulation of the Deepwater Horizon Surface Oil Burns (JOURNAL)
Emissions from oil fires associated with the “Deepwater Horizon” explosion and oil discharge that began on April 20, 2010 in the Gulf of Mexico were analyzed chemically to only a limited extent at the time but were shown to induce oxidative damage in vitro and in mice. To extend ...
Evaluation of an Air Quality Health Index for Predicting the Mutagenicity of Simulated Atmospheres (JOURNAL)
No study has evaluated the mutagenicity of atmospheres with a calculated air quality health index (AQHI). Thus, we generated in a UV-light-containing reaction chamber two simulated atmospheres (SAs) with similar AQHIs but different proportions of criteria pollutants and evaluated...