A5023907847- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Spectroscopy and Laser Applications
- Meteorological Phenomena and Simulations
- Climate variability and models
- Soil Geostatistics and Mapping
- COVID-19 impact on air quality
- Geochemistry and Geologic Mapping
- Advanced Chemical Sensor Technologies
- Vehicle emissions and performance
- Advanced Sensor and Control Systems
- Methane Hydrates and Related Phenomena
- Laser Design and Applications
- Fault Detection and Control Systems
- Hydrocarbon exploration and reservoir analysis
- Wind and Air Flow Studies
- Flow Measurement and Analysis
- Gas Sensing Nanomaterials and Sensors
- Atmospheric Ozone and Climate
- Analytical Chemistry and Sensors
- Advanced Computational Techniques and Applications
- Simulation and Modeling Applications
- Groundwater flow and contamination studies
National Institute of Standards and Technology
2015-2023
University of Notre Dame
2021-2023
University of Colorado Boulder
2016
Abstract Responses to COVID‐19 have resulted in unintended reductions of city‐scale carbon dioxide (CO 2 ) emissions. Here, we detect and estimate decreases CO emissions Los Angeles Washington DC/Baltimore during March April 2020. We present three lines evidence using methods that increasing model dependency, including an inverse relative changes 2020 compared 2018 2019. The decrease (25%) is largely supported by a drop natural gas consumption associated with warm spring whereas the (33%)...
Abstract A credible assessment of a city’s greenhouse gas (GHG) mitigation policies requires valid account emissions. However, questions persist as to whether cities’ ‘self-reported inventories’ (SRIs) are accurate, precise, and consistent enough track progress toward city goals. Although useful for broad policy initiatives, SRIs provide annual snapshots that may have limited use managers looking develop targeted overlap with other issues like equity, air quality, human health. An emerging...
Abstract Atmospheric CO 2 measurements from a dense surface network can help to evaluate terrestrial biosphere model (TBM) simulations of Net Ecosystem Exchange (NEE) with two key benefits. First, gridded flux estimates be evaluated over regional scales, not possible using tower observations at discrete locations for evaluation. Second, TBM ability explain atmospheric fluctuations due the directly tested, an important objective anthropogenic emissions monitoring observations. Here, we...
Urban methane emissions estimated using atmospheric observations have been found to exceed estimates derived by traditional inventory methods in several northeastern US cities. In this work, we leveraged a nearly five-year record of from dense tower network coupled with newly developed high-resolution map quantify emission rates Washington, DC, and Baltimore, Maryland. Annual averaged over 2018-2021 were 80.1 [95% CI: 61.2, 98.9] Gg the DC urban area 47.4 35.9, 58.5] Baltimore area,...
Earth and Space Science Open Archive This work has been accepted for publication in Journal of Geophysical Research - Biogeosciences. Version RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v1]A modified Vegetation Photosynthesis Respiration Model (VPRM) eastern USA Canada, evaluated with comparison to atmospheric observations other biospheric...
As city governments take steps towards establishing emissions reduction targets, the atmospheric research community is increasingly able to assist in tracking reductions. Researchers have established systems for observing greenhouse gases urban areas with aim of attributing gas concentration enhancements (and thus, emissions) region question. However, attribute a particular region, one must isolate component observed attributable fluxes inside by removing background, which due outside. In...
We present and discuss the use of a high-dimensional computational method for atmospheric inversions that incorporates space-time structure transport dispersion errors. In urban environments, errors are largely result our inability to capture true underlying greenhouse gas (GHG) emissions observational sites. Motivated by impact model error on estimates fluxes GHGs using in situ tower-based mole-fraction observations, we specifically address need characterize structures high-resolution...
Abstract. Advances in natural gas extraction technology have led to increased activity the production and transport sectors United States and, as a consequence, an need for reliable monitoring of methane leaks atmosphere. We present statistical methodology combination with observing system detection attribution fugitive emissions from distributed potential source location landscapes such sites. measure long (> 500 m), integrated open-path concentrations atmospheric using dual frequency...
Abstract. Advances in natural gas extraction technology have led to increased activity the production and transport sectors United States, and, as a consequence, an need for reliable monitoring of methane leaks atmosphere. We present statistical methodology combination with observing system detection attribution fugitive emissions from distributed potential source location landscapes such sites. measure long (> 500 m), integrated open path concentrations atmospheric using dual frequency...
Considerable uncertainty exists regarding the contribution of oil and gas operations to anthropogenic emissions atmospheric methane.Additionally, new proposed EPA regulations on volatile organic compound (VOC) from production facilities have been expanded include methane, making this a topic growing importance industry as well regulators.In order gain better understanding emissions, reliable techniques that enable long-term monitoring entire are needed.Recent advances in development compact...
Abstract. Several metrics have been proposed and utilized to diagnose the performance of linear Bayesian geostatistical atmospheric inverse problems. These primarily assess reductions in prior uncertainties, compare modeled observations true observations, check distributional assumptions. Although important, these should be augmented with a sensitivity analysis obtain comprehensive understanding inversion improve quality confidence estimates. In this study, we derive closed-form expressions...
Abstract. Multiple metrics have been proposed and utilized to assess the performance of linear Bayesian geostatistical inverse problems. These are mostly related assessing reduction in prior uncertainties, comparing modeled observations true observations, checking distributional assumptions. though important should be augmented with sensitivity analysis obtain a comprehensive understanding inversions critically improve confidence estimated fluxes. With this motivation, we derive analytical...
Abstract. As city governments take steps towards establishing emissions reduction targets, the atmospheric research community is increasingly able to assist in tracking reductions. Researchers have established systems for observing greenhouse gases urban areas with aim of attributing gas concentration enhancements (and thus, emissions) region question. However, attribute a particular region, one must isolate component observed attributable fluxes inside by removing background, which due...
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text G. B. Rieker, S. Coburn, C. Alden, R. Wright, K. Prasad, Ghosh, Truong, Cossel, E. Baumann, I. Coddington, and N. Newbury, "Locating Methane Leaks Across Large Areas Frequency Comb Lasers," in Conference Lasers Electro-Optics, OSA Technical Digest (online) (Optica Publishing Group, 2017), paper ATh1B.5. Export BibTex Endnote (RIS) HTML Plain alert Save article
<p>In the past decade, there has been a scientific focus on improving accuracy and precision of methane (CH4) emission estimates in United States, with much effort targeting oil natural gas producing basins. Yet, regional CH4 emissions their attribution to specific sources continue have significant associated uncertainties. Recent urban work using aircraft observations suggested that are not well characterized major cities along U.S. East Coast; discrepancies attributed an...