Rebecca S. Hornbrook
A5039498699- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Fire effects on ecosystems
- Atmospheric aerosols and clouds
- Vehicle emissions and performance
- Mercury impact and mitigation studies
- Ocean Acidification Effects and Responses
- Water Quality Monitoring and Analysis
- Toxic Organic Pollutants Impact
- Ionosphere and magnetosphere dynamics
- Advanced Chemical Sensor Technologies
- Marine and coastal ecosystems
- Odor and Emission Control Technologies
- Isotope Analysis in Ecology
- Climate variability and models
- Fire dynamics and safety research
- Meteorological Phenomena and Simulations
- Plant responses to elevated CO2
- Indoor Air Quality and Microbial Exposure
- Astro and Planetary Science
- Industrial Gas Emission Control
- Methane Hydrates and Related Phenomena
NSF National Center for Atmospheric Research
2016-2025
Atmospheric Chemistry Observations & Modeling
2016-2024
University of Michigan
2019
Dimethyl sulfide (DMS), emitted from the oceans, is most abundant biological source of sulfur to marine atmosphere. Atmospheric DMS oxidized condensable products that form secondary aerosols affect Earth's radiative balance by scattering solar radiation and serving as cloud condensation nuclei. We report atmospheric discovery a previously unquantified oxidation product, hydroperoxymethyl thioformate (HPMTF, HOOCH2SCHO), identified through global-scale airborne observations demonstrate it be...
Abstract The Deep Convective Clouds and Chemistry (DC3) field experiment produced an exceptional dataset on thunderstorms, including their dynamical, physical, electrical structures impact the chemical composition of troposphere. gathered detailed information inflow outflow regions midlatitude thunderstorms in northeast Colorado, west Texas to central Oklahoma, northern Alabama. A unique aspect DC3 strategy was locate sample convective a day after active convection order measure...
Abstract Nocturnal dinitrogen pentoxide (N 2 O 5 ) heterogeneous chemistry impacts regional air quality and the distribution lifetime of tropospheric oxidants. Formed from oxidation nitrogen oxides, N is heterogeneously lost to aerosol with a highly variable reaction probability, γ ), dependent on composition ambient conditions. Reaction products include soluble nitrate (HNO 3 or NO − nitryl chloride (ClNO ). We report first‐ever derivations wintertime aircraft measurements in critically...
Wildfires have a significant adverse impact on air quality in the United States (US). To understand potential health impacts of wildfire smoke, many epidemiology studies rely concentrations fine particulate matter (PM) as smoke tracer. However, there are gas-phase hazardous pollutants (HAPs) identified by Environmental Protection Agency (EPA) that also present plumes. Using observations from Western Wildfire Experiment for Cloud Chemistry, Aerosol Absorption, and Nitrogen (WE-CAN), 2018...
Significance Understanding the sources of tropospheric ozone is important for effective air quality management and accurate radiative forcing attribution. Biomass burning emits large quantities precursors to lower atmosphere. This source can drive regional-scale production, but its impact on global poorly constrained. Here, we present unique in situ aircraft observations continental pollution tracers. Ozone enhancements attributable biomass equal or exceed those from urban emissions, a...
Abstract We present emission measurements of volatile organic compounds (VOCs) for western U.S. wildland fires made on the NSF/NCAR C‐130 research aircraft during Western Wildfire Experiment Cloud Chemistry, Aerosol Absorption, and Nitrogen (WE‐CAN) field campaign in summer 2018. VOCs were measured with complementary instruments onboard C‐130, including a proton‐transfer‐reaction time‐of‐flight mass spectrometer (PTR‐ToF‐MS) two gas chromatography (GC)‐based methods. Agreement within...
Abstract This article provides an overview of the NASA Atmospheric Tomography (ATom) mission and a summary selected scientific findings to date. ATom was airborne measurements modeling campaign aimed at characterizing composition chemistry troposphere over most remote regions Pacific, Southern, Atlantic, Arctic Oceans, examining impact anthropogenic natural emissions on global scale. These dominate chemical reactivity are exceptionally important for air quality climate. data provide in situ...
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...
A new configuration of the Community Earth System Model (CESM)/Community Atmosphere with full chemistry (CAM-chem) supporting capability horizontal mesh refinement through use spectral element (SE) dynamical core is developed and called CESM/CAM-chem-SE. Horizontal in CESM/CAM-chem-SE unique novel that pollutants such as ozone are accurately represented at human exposure relevant scales while also directly including global feedbacks. down to ∼14 km over conterminous US (CONUS) beginning...
Abstract. Proton-transfer-reaction time-of-flight mass spectrometry (PTR-ToF-MS) is a technique commonly used to measure ambient volatile organic compounds (VOCs) in urban, rural, and remote environments. PTR-ToF-MS known produce artifacts from ion fragmentation, which complicates the interpretation quantification of key atmospheric VOCs. This study evaluates extent fragmentation other ionization processes impact urban measurements ions typically assigned isoprene (m/z 69, C5H8H+),...
Abstract. Extensive airborne measurements of non-methane organic gases (NMOGs), methane, nitrogen oxides, reduced species, and aerosol emissions from US wild prescribed fires were conducted during the 2019 NOAA/NASA Fire Influence on Regional to Global Environments Air Quality campaign (FIREX-AQ). Here, we report atmospheric enhancement ratios (ERs) inferred emission factors (EFs) for compounds measured board NASA DC-8 research aircraft nine wildfires one fire, which encompass a range...
Abstract Most intensive field studies investigating aerosols have been conducted in summer, and thus, wintertime aerosol sources chemistry are comparatively poorly understood. An mass spectrometer was flown on the National Science Foundation/National Center for Atmospheric Research C‐130 during Wintertime INvestigation of Transport, Emissions, Reactivity (WINTER) 2015 campaign northeast United States. The fraction boundary layer submicron that organic (OA) about a factor 2 smaller than 2011...
Significance Our measurements show that tropospheric halogen chemistry has a larger capacity to destroy O 3 and oxidize atmospheric mercury than previously recognized. Halogen is currently missing in most global climate models, effective at removing altitudes where intercontinental transport occurs. It further helps explain the low levels preindustrial times. Public health concerns arise from bioaccumulation of neurotoxin fish. results emphasize bromine free troposphere oxidizes faster rate,...
Abstract High time resolution measurements of volatile organic compounds (VOCs) were collected using a proton‐transfer‐reaction quadrupole mass spectrometry (PTR‐QMS) instrument at the Platteville Atmospheric Observatory (PAO) in Colorado to investigate how oil and natural gas (O&NG) development impacts air quality within Wattenburg Gas Field (WGF) Denver‐Julesburg Basin. The carried out July August 2014 as part NASA's “Deriving Information on Surface Conditions from Column Vertically...
Wildfires are an important source of nitrous acid (HONO), a photolabile radical precursor, yet in situ measurements and quantification primary HONO emissions from open wildfires have been scarce. We present airborne observations within wildfire plumes sampled during the Western Wildfire Experiment for Cloud chemistry, Aerosol absorption Nitrogen (WE-CAN) campaign. ΔHONO/ΔCO close to fire locations ranged 0.7 17 pptv ppbv–1 using maximum enhancement method, with median similar previous...
Abstract As part of the Deep Convective Cloud and Chemistry (DC3) experiment, National Science Foundation/National Center for Atmospheric Research (NCAR) Gulfstream‐V (GV) NASA DC‐8 research aircraft probed chemical composition inflow outflow two convective storms (north storm, NS, south SS) originating in Colorado region on 22 June 2012, a time when High Park wildfire was active area. A wide range trace species were measured board both including biomass burning (BB) tracers hydrogen cyanide...
Abstract The Convective Transport of Active Species in the Tropics (CONTRAST) experiment was conducted from Guam (13.5°N, 144.8°E) during January–February 2014. Using NSF/NCAR Gulfstream V research aircraft, investigated photochemical environment over tropical western Pacific (TWP) warm pool, a region massive deep convection and major pathway for air to enter stratosphere Northern Hemisphere (NH) winter. new observations provide wealth information quantifying influence on vertical...
Abstract The Western Wildfire Experiment for Cloud Chemistry, Aerosol Absorption, and Nitrogen (WE‐CAN) deployed the NSF/NCAR C‐130 aircraft in summer 2018 across western U.S. to sample wildfire smoke during its first days of atmospheric evolution. We present a summary subset reactive oxidized nitrogen species (NO y ) plumes sampled pseudo‐Lagrangian fashion. Emissions oxides x = NO + 2 nitrous acid (HONO) are rapidly converted more forms. Within 4 h, ∼86% ΣNO is form peroxy acyl nitrates...
Abstract We report airborne measurements of acetaldehyde (CH 3 CHO) during the first and second deployments National Aeronautics Space Administration Atmospheric Tomography Mission (ATom). The budget CH CHO is examined using Community Model with chemistry (CAM‐chem), a newly developed online air‐sea exchange module. upper limit global ocean net emission estimated to be 34 Tg/a (42 if considering bubble‐mediated transfer), impacts on tropospheric are mostly confined marine boundary layer. Our...
Abstract Emissions of methane (CH 4 ) and volatile organic compounds (VOCs) from oil gas production may have large impacts on air quality climate change. Methane VOCs were measured over the Haynesville Marcellus shale plays board National Center for Atmospheric Research C‐130 NOAA WP‐3D research aircraft in June–July 2013. We used an eddy covariance technique to measure situ fluxes CH benzene both flights with high‐resolution data (10 Hz) low‐resolution (1 Hz). Correlation ( R = 0.65)...
Abstract Methanol is the second‐most abundant organic gas in remote atmosphere after methane, but its sources are poorly understood. Here, we report a global budget of methanol constrained by observations from ATom aircraft campaign as implemented GEOS‐Chem atmospheric chemistry model. under background marine conditions can be fit model with surface ocean concentration 61 nM and yield 13% newly CH 3 O 2 + OH reaction. While terrestrial biogenic emissions dominate budget, secondary production...