A5056589610- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Air Quality and Health Impacts
- Fire effects on ecosystems
- Atmospheric Ozone and Climate
- Atmospheric aerosols and clouds
- Vehicle emissions and performance
- Energy and Environment Impacts
- Air Quality Monitoring and Forecasting
- Plant responses to elevated CO2
- Fire dynamics and safety research
- Climate Change and Health Impacts
- Methane Hydrates and Related Phenomena
- Indoor Air Quality and Microbial Exposure
- Energy, Environment, and Transportation Policies
- Hybrid Renewable Energy Systems
- Career Development and Diversity
- Climate variability and models
- Social Acceptance of Renewable Energy
- COVID-19 epidemiological studies
- Interdisciplinary Research and Collaboration
- Health and Medical Research Impacts
- Toxic Organic Pollutants Impact
- Oil, Gas, and Environmental Issues
- Spacecraft and Cryogenic Technologies
University of Colorado Boulder
2007-2025
Cooperative Institute for Research in Environmental Sciences
2015-2025
University of Colorado System
2019-2023
NSF National Center for Atmospheric Research
2012-2021
Colorado School of Public Health
2019
Atmospheric Chemistry Observations & Modeling
2016-2017
Research Applications (United States)
2014
University of Michigan
2014
University Corporation for Atmospheric Research
2012
Northern Arizona University
2010
Abstract. Reactive gases and aerosols are produced by terrestrial ecosystems, processed within plant canopies, can then be emitted into the above-canopy atmosphere. Estimates of fluxes needed for quantitative earth system studies assessments past, present future air quality climate. The Model Emissions Gases Aerosols from Nature (MEGAN) is described used to quantify net biosphere emission isoprene MEGAN designed both global regional modeling has coverage with ~1 km2 spatial resolution. Field...
The Model for Ozone and Related chemical Tracers, version 4 (MOZART-4) is an offline global transport model particularly suited studies of the troposphere. updates from its previous MOZART-2 are described, including expansion mechanism to include more detailed hydrocarbon chemistry bulk aerosols. Online calculations a number processes, such as dry deposition, emissions isoprene monoterpenes photolysis frequencies, now included. Results eight-year simulation (2000–2007) presented evaluated....
Abstract. Biomass burning (BB) is the second largest source of trace gases and primary fine carbonaceous particles in global troposphere. Many recent BB studies have provided new emission factor (EF) measurements. This especially true for non-methane organic compounds (NMOC), which influence secondary aerosol (SOA) ozone formation. New EF should improve regional to emissions estimates therefore, input atmospheric models. In this work we present an up-to-date, comprehensive tabulation known...
Abstract. The Fire INventory from NCAR version 1.0 (FINNv1) provides daily, 1 km resolution, global estimates of the trace gas and particle emissions open burning biomass, which includes wildfire, agricultural fires, prescribed does not include biofuel use trash burning. Emission factors used in calculations have been updated with recent data, particularly for non-methane organic compounds (NMOC). resulting annual NMOC emission are as much a factor 5 greater than some prior estimates....
Abstract. The global methane (CH4) budget is becoming an increasingly important component for managing realistic pathways to mitigate climate change. This relevance, due a shorter atmospheric lifetime and stronger warming potential than carbon dioxide, challenged by the still unexplained changes of CH4 over past decade. Emissions concentrations are continuing increase, making second most human-induced greenhouse gas after dioxide. Two major difficulties in reducing uncertainties come from...
Abstract. In March 2006 two instrumented aircraft made the first detailed field measurements of biomass burning (BB) emissions in Northern Hemisphere tropics as part MILAGRO project. The were National Center for Atmospheric Research C-130 and a University Montana/US Forest Service Twin Otter. initial up to 49 trace gas or particle species measured from 20 deforestation crop residue fires on Yucatan peninsula. This included gases useful indicators BB (HCN acetonitrile) several rarely, never...
The open burning of waste, whether at individual residences, businesses, or dump sites, is a large source air pollutants. These emissions, however, are not included in many current emission inventories used for chemistry and climate modeling applications. This paper presents the first comprehensive consistent estimates global emissions greenhouse gases, particulate matter, reactive trace toxic compounds from waste burning. Global CO2 relatively small compared to total anthropogenic CO2;...
Bacteria and fungi are ubiquitous throughout the Earth's lower atmosphere where they often represent an important component of atmospheric aerosols with potential to impact human health dynamics. However, diversity, composition, spatiotemporal dynamics these airborne microbes remain poorly understood. We performed a comprehensive analysis across two aerosol size fractions at urban rural sites in Colorado Front Range over 14-month period. Coarse (PM10–2.5) fine (PM2.5) particulate matter...
Quantifying isoprene emissions using satellite observations of the formaldehyde (HCHO) columns is subject to errors involving column retrieval and assumed relationship between HCHO emissions, taken here from GEOS‐CHEM chemical transport model. Here we use a 6‐year (1996–2001) data set Global Ozone Monitoring Experiment (GOME) instrument (1) quantify these errors, (2) evaluate GOME‐derived with in situ flux measurements process‐based emission inventory (Model Emissions Gases Aerosols Nature,...
ADVERTISEMENT RETURN TO ISSUEPREVFeatureNEXT"What We Breathe Impacts Our Health: Improving Understanding of the Link between Air Pollution and Health"J. Jason West*†, Aaron Cohen*‡, Frank Dentener*§, Bert Brunekreef∥, Tong Zhu*⊥, Ben Armstrong#, Michelle L. Bell∇, Michael Brauer○, Gregory Carmichael◆, Dan Costa¶, Douglas W. Dockery★, Kleeman⊗, Michal Krzyzanowski⧓, Nino Künzli☼◑, Catherine Liousse◊, Shih-Chun Candice Lung@, Randall V. Martin¢$, Ulrich Pöschl⧳, C. Arden Pope, III¥, James M....
Bacteria and fungi are ubiquitous in the atmosphere. The diversity abundance of airborne microbes may be strongly influenced by atmospheric conditions or even influence themselves acting as ice nucleators. However, few comprehensive studies have described dynamics bacteria based on culture-independent techniques. We document microbial abundance, community composition, nucleation at a high-elevation site northwestern Colorado. used standard small-subunit rRNA gene Sanger sequencing approach...
Many prior studies clearly document episodic Asian pollution in the western U.S. free troposphere. Here, we examine mechanisms involved transport of plumes into surface air through an integrated analysis situ and satellite measurements May–June 2010 with a new global high‐resolution (∼50 × 50 km 2 ) chemistry‐climate model (GFDL AM3). We find that AM3 full stratosphere‐troposphere chemistry nudged to reanalysis winds successfully reproduces observed sharp ozone gradients above California,...
Abstract Vegetation and peatland fires cause poor air quality thousands of premature deaths across densely populated regions in Equatorial Asia. Strong El-Niño positive Indian Ocean Dipole conditions are associated with an increase the frequency intensity wildfires Indonesia Borneo, enhancing population exposure to hazardous concentrations smoke pollutants. Here we investigate impact on Asia during Fall 2015, which were largest over past two decades. We performed high-resolution simulations...
Anthropogenic pollution in Africa is dominated by diffuse and inefficient combustion sources, as electricity access low motorcycles outdated cars proliferate. These sources are missing, out-of-date, or misrepresented state-of-the-science emission inventories. We address these deficiencies with a detailed inventory of Diffuse Inefficient Combustion Emissions (DICE-Africa) for 2006 2013. Fuelwood energy the largest source DICE-Africa, but grows from to 2013 at slower rate than charcoal...
Abstract. We present the Fire Inventory from National Center for Atmospheric Research (NCAR) version 2.5 (FINNv2.5), a fire emissions inventory that provides publicly available of trace gases and aerosols various applications, including use in global regional atmospheric chemistry modeling. FINNv2.5 includes numerous updates to FINN 1 framework better represent burned area, vegetation burned, chemicals emitted. Major changes include active detections Visible Infrared Imaging Radiometer Suite...
Abstract We analyze the effects of diurnal cycle fire emissions (DCFE) and plume rise on U.S. air quality using MUSICAv0 (Multi‐Scale Infrastructure for Chemistry Aerosols Version 0) model during FIREX‐AQ (Fire Influence Regional to Global Environments Air Quality) WE‐CAN (Western wildfire Experiment Cloud chemistry, Aerosol absorption Nitrogen) field campaigns. To include DCFE in model, we employ two approaches: a climatology derived from satellite radiative power product. also implemented...
Petrochemical industrial facilities can emit large amounts of highly reactive hydrocarbons and NO x to the atmosphere; in summertime, such colocated emissions are shown consistently result rapid efficient ozone (O 3 ) formation downwind. Airborne measurements show initial hydrocarbon reactivity petrochemical source plumes Houston, TX, metropolitan area is primarily due routine alkenes propene ethene. Reported these compounds substantially lower than inferred from sources. Net O rates yields...
Abstract. Reactive gases and aerosols are produced by terrestrial ecosystems, processed within plant canopies, can then be emitted into the above-canopy atmosphere. Estimates of fluxes needed for quantitative earth system studies assessments past, present future air quality climate. The Model Emissions Gases Aerosols from Nature (MEGAN) is described used to quantify net biosphere emission isoprene MEGAN designed both global regional modeling has coverage with ~1 km2 spatial resolution. Field...
Abstract. The present study investigates effects of wildfire emissions on air quality in Europe during an intense fire season that occurred summer 2003. A meso-scale chemistry transport model CHIMERE is used, together with ground based and satellite aerosol optical measurements, to assess the dispersion quantify associated radiative effects. has been improved take into account a MODIS-derived daily smoke emission inventory as well injection altitude particles. simulated properties are put...
Biogenic volatile organic compounds (BVOC) contribute significantly to the formation of ozone and secondary aerosol (SOA). The Model Emissions Gases Aerosols from Nature (MEGANv2.02) is used estimate emissions isoprene, monoterpenes (MT), sesquiterpenes (SQT) across United States. Compared Emission Inventory System (BEIS3.0), MEGANv2.02 estimates higher isoprene but lower MT for July 2001 January 2002. A sensitivity study SQT emission factors algorithm parameters was conducted by assigning...
Abstract. We describe the large-scale meteorological conditions that affected atmospheric chemistry over Mexico during March 2006 when several field campaigns were conducted in region. In-situ and remote-sensing instrumentation was deployed to obtain measurements of wind, temperature, humidity profiles boundary layer free atmosphere at four primary sampling sites central Mexico. Several models run operationally campaign provide forecasts local, regional, synoptic meteorology as well...
This paper provides a synthesis of results that have emerged from recent modeling studies the potential sensitivity U.S. regional ozone (O3) concentrations to global climate change (ca. 2050). research has been carried out under auspices an ongoing Environmental Protection Agency (EPA) assessment effort increase scientific understanding multiple complex interactions among climate, emissions, atmospheric chemistry, and air quality. The ultimate goal is enhance ability quality managers...
Biogenic volatile organic compound (BVOC) emissions were studied using vegetation enclosure experiments. Particular emphasis was given to sesquiterpene compounds (SQT), although monoterpenes (MT) also characterized. SQT detected in from seven (out of eight) pine species that examined. Thirteen identified; the most abundant ones beta-caryophyllene, alpha-bergamotene, beta-farnesene, and alpha-farnesene, with emission rates increasing exponentially temperature. Regression analysis yielded...