A5041187627- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Spectroscopy and Laser Applications
- Methane Hydrates and Related Phenomena
- Climate variability and models
- Hydrocarbon exploration and reservoir analysis
- Air Quality Monitoring and Forecasting
- Meteorological Phenomena and Simulations
- Air Quality and Health Impacts
- Geochemistry and Geologic Mapping
- CO2 Sequestration and Geologic Interactions
- Vehicle emissions and performance
- Peatlands and Wetlands Ecology
- Groundwater and Isotope Geochemistry
- Groundwater flow and contamination studies
- Forest Management and Policy
- Calibration and Measurement Techniques
- Soil and Water Nutrient Dynamics
- Forest ecology and management
- Agriculture Sustainability and Environmental Impact
- German legal, social, and political studies
- Cryospheric studies and observations
- Reservoir Engineering and Simulation Methods
- Marine and coastal ecosystems
NOAA Earth System Research Laboratory
2017-2025
National Oceanic and Atmospheric Administration
2020-2024
Cooperative Institute for Research in Environmental Sciences
2017-2023
University of Colorado Boulder
2017-2023
University of Colorado System
2020-2021
Pennsylvania State University
2015-2017
Park University
2015
Abstract. The Total Carbon Column Observing Network (TCCON) measures column-average mole fractions of several greenhouse gases (GHGs) beginning in 2004 from over 30 current or past measurement sites around the world, using solar absorption spectroscopy near infrared region. TCCON GHG data have been used extensively for multiple purposes, including studies carbon cycle and anthropogenic emissions as well to validate improve observations made spacebased sensors. Here, we describe an update...
Abstract. The Total Carbon Column Observing Network (TCCON) measures column-average mole fractions of several greenhouse gases (GHGs), beginning in 2004, from over 30 current or past measurement sites around the world using solar absorption spectroscopy near-infrared (near-IR) region. TCCON GHG data have been used extensively for multiple purposes, including studies carbon cycle and anthropogenic emissions, as well to validate improve observations space-based sensors. Here, we describe an...
Ozone pollution affects human health, especially in urban areas on hot sunny days. Its basic photochemistry has been known for decades and yet it is still not possible to correctly predict the high ozone levels that are greatest threat. The CalNex_SJV study Bakersfield CA May/June 2010 provided an opportunity examine area surrounded by agriculture. measurement suite included hydroxyl (OH), hydroperoxyl (HO<sub>2</sub>), OH reactivity, which compared with output of a photochemical box model....
Abstract. In this study, an extension on the previously reported status of COllaborative Carbon Column Observing Network's (COCCON) calibration procedures incorporating refined methods is presented. COCCON a global network portable Bruker EM27/SUN FTIR spectrometers for deriving column-averaged atmospheric abundances greenhouse gases. The original laboratory open-path lamp measurements instrumental line shape (ILS) spectrometer from water vapour lines have been and extended to secondary...
Abstract. The Copernicus Atmosphere Monitoring Service (CAMS) has recently produced a greenhouse gas reanalysis (version egg4) that covers almost 2 decades from 2003 to 2020 and which will be extended in the future. This dataset includes carbon dioxide (CO2) methane (CH4). procedure combines model data with satellite into globally complete consistent using European Centre for Medium-Range Weather Forecasts' Integrated Forecasting System (IFS). been carefully evaluated against independent...
Abstract. Optimal estimation retrievals of trace gas total columns require prior vertical profiles the gases retrieved to drive forward model and ensure retrieval problem is mathematically well posed. For well-mixed gases, it possible derive accurate using an algorithm that accounts for general patterns atmospheric transport coupled with measured time series in questions. Here we describe used generate GGG2020, a new version GGG analyze spectra from solar-viewing Fourier transform...
Abstract We present observations of local enhancements in carbon dioxide (CO 2 ) from emissions sources over three eastern US regions during four deployments the Atmospheric Carbon Transport‐America (ACT‐America) campaign between summer 2016 and spring 2018. Local CO were characterized by monoxide (CO) to enhancement ratios (i.e., ΔCO/ΔCO air mass mixing observed aircraft transects within planetary boundary layer. By analyzing regional‐scale variability as a function ratios, relative...
Abstract. We apply airborne measurements across three seasons (summer, winter and spring 2017–2018) in a multi-inversion framework to quantify methane emissions from the US Corn Belt Upper Midwest, key agricultural wetland source region. Combing our seasonal results with prior fall values we find that wetlands are largest regional (32 %, 20 [16–23] Gg/d), while livestock (enteric/manure; 25 15 [14–17] Gg/d) anthropogenic source. Natural gas/petroleum, waste/landfills, coal mines collectively...
Abstract. Reducing methane (CH4) emissions from the oil and gas (O&amp;G) sector is crucial for mitigating climate change in near term. MethaneSAT an upcoming satellite mission designed to monitor basin-wide O&amp;G globally, providing estimates of emission rates helping identify underlying processes leading release atmosphere. data will support advocacy policy efforts by track reduction commitments targets set countries industries. Here, we introduce a CH4 retrieval algorithm based...
Abstract. Observations of carbon monoxide (CO) from the Measurements Of Pollution In The Troposphere (MOPITT) instrument aboard Terra spacecraft were expected to have an accuracy 10 % prior launch in 1999. Here we evaluate MOPITT Version 7 joint (V7J) thermal-infrared and near-infrared (TIR–NIR) retrieval precision suggest ways further improve observations. We take five steps involving filtering or bias corrections reduce scatter data relative other soundings ground-based measurements. (1)...
Abstract. Tunable laser direct absorption spectroscopy is a widely used technique for the in situ sensing of atmospheric composition. Aircraft deployment poses challenging operating environment instruments measuring climatologically relevant gases Earth's atmosphere. Here, we demonstrate successful adaption commercially available continuous wave quantum cascade (QCL) and interband (ICL) based spectrometer airborne trace gas measurements with local to regional focus. The instrument measures...
Abstract The Atmospheric Carbon and Transport (ACT)-America NASA Earth Venture Suborbital Mission set out to improve regional atmospheric greenhouse gas (GHG) inversions by exploring the intersection of strong GHG fluxes vigorous transport that occurs within midlatitudes. Two research aircraft instrumented with remote in situ sensors measure mole fractions, associated trace gases, state variables collected 1,140.7 flight hours data, distributed across 305 individual sorties, coordinated 121...
Abstract. EM27/SUN devices are portable solar-viewing Fourier transform spectrometers (FTSs) that being widely used to constrain measurements of greenhouse gas emissions and validate satellite trace measurements. On a 6-week-long campaign in the summer 2018, four were taken five Total Carbon Column Observing Network (TCCON) stations North America, measure side by side, better understand their durability, accuracy precision retrievals from measurements, site-to-site bias among TCCON sites. We...
Abstract Diagnosing carbon dioxide (CO 2 ) and methane (CH 4 fluxes at subcontinental scales is complicated by sparse observations, limited knowledge of prior their uncertainties, background transport errors. Multispecies measurements in flasks sampled during the wintertime ACT‐America campaign were used for characterization source apportionment regional anthropogenic CO CH when ecosystem exchange likely to be least active. Continental trace gas mole fractions enhancements are defined using...
Abstract. We present new observations of trace gases in the stratosphere based on a cost-effective sampling technique that can access much higher altitudes than aircraft. The further development this method now provides detection species with abundances parts per trillion (ppt) range and below. obtain mixing ratios for six (CFC-11, CFC-12, HCFC-22, H-1211, H-1301, SF6), all which are important understanding stratospheric ozone depletion circulation. After demonstrating quality data through...
Abstract Sulfuryl fluoride (SO 2 F ) is a synthetic pesticide and potent greenhouse gas that accumulating in the global atmosphere. Rising emissions are concern since SO has relatively long atmospheric lifetime high warming potential. The U.S. thought to contribute substantially emissions, but there paucity of information on how distributed across U.S., currently no inventory for or individual states. Here we provide an measurement-based estimate using high-precision measurements from NOAA...
Abstract. Atmospheric methane (CH4) and nitrous oxide (N2O) are potent greenhouse gases with significant impacts on climate change. Accurate measurement of their atmospheric abundance is essential for understanding sources, sinks, the impact human activities atmosphere. Ground-based high-resolution Fourier Transform Infrared (FTIR) observations, employed by collaborative international initiatives like Working Group (IRWG) within Network Detection Composition Change (NDACC), play a vital role...
Abstract. Inverse model intercomparison projects (MIPs) provide a chance to assess the uncertainties in inversion estimates arising from various sources. However, accurately quantifying ensemble CO2 flux errors remains challenging and often relies on spread. This study proposes method for regional net surface–atmosphere models taken Orbiting Carbon Observatory-2 (OCO-2) v10 MIP by using independent airborne measurements period 2015–2017. We first calculate root mean square error (RMSE)...
The COllaborative Carbon Column Observing Network has become a reliable source of high-quality ground-based remote sensing network data that provide column-averaged dry-air mole fractions carbon dioxide (XCO2), methane (XCH4), and monoxide (XCO). fiducial reference measurements these gases from the COCCON complement TCCON NDACC-IRWG data. This study shows application for validation existing greenhouse gas satellite products. includes XCH4 XCO products European Copernicus Sentinel-5 Precursor...
Abstract. Accurately quantifying regional anthropogenic CO2 fluxes is fundamental to improving our understanding of the carbon cycle and for creating effective mitigation policies, radiocarbon total ratio in atmospheric (Δ14CO2) a robust tracer fossil fuel that can discriminate between biogenic sources. NASA’s ACT-America airborne mission 2016 2019 aimed improve accuracy greenhouse gas flux estimates, through refining characterization uncertainties models. Δ14CO2 observations from 26 flights...
A global network of soundings tracked stratospheric water vapor (H2O) and aerosol enhancements for two years after the explosive eruption submarine Hunga volcano in January 2022. Balloon-borne measurements highlight importance rapid transport from tropics to northern hemisphere (NH) midlatitudes sensitivity H2O entry radiative heating near tropical tropopause. Aerosol plumes separated vertically within four months&#8212;H2O was initially transported along isentropic levels at 20...
This paper provides an overview of the validation National Oceanic and Atmospheric Administration (NOAA) operational retrievals atmospheric carbon trace gas profiles, specifically monoxide (CO), methane (CH4) dioxide (CO2), from NOAA-Unique Combined Processing System (NUCAPS), a NOAA enterprise algorithm that retrieves profile environmental data records (EDRs) under global non-precipitating (clear to partly cloudy) conditions. Vertical information about gases is obtained Cross-track Infrared...