...Nathan Blume; Timothy G. Pernini; Jeremy T. Dobler; T. Scott Zaccheo; Doug McGregor; Clay Bell Path-integrated column measurements with a laser-absorption-based measurement system have been used to detect, locate, and quantify methane emissions from a series of single-blind controlled releases...

...Dana R. Caulton; Priya D. Gurav; Anna M. Robertson; Kristen Pozsonyi; Shane M. Murphy; David R. Lyon There has been increasing interest in quantifying methane (CH 4 ) emissions from a view toward mitigation. Accordingly, ground-based sampling of oil and gas production sites in the Permian Basin...

...Amber M. Yeoman; Alastair C. Lewis Disposable compressed gas aerosols have been a ubiquitous part of life since the mid-1950s. The signing of the Montreal Protocol in 1987 led to aerosol propellants changing from halocarbons to less damaging replacements; around 93% of current aerosol emissions...

... in Australia, highlighting new observational constraints on atmospheric concentrations, emissions, and deposition and, where possible, comparing these to model estimates. We also provide our best estimate of the current Australian atmospheric mercury budget. Ambient mercury observations collected to date show...

... regional anomaly (“hot spot”) in the United States. Over a 3-week period in April 2015, we conducted ground and airborne atmospheric measurements to investigate daily wind regimes and CH 4 emissions in this region of SW Colorado and NW New Mexico. The SJB, similar to other topographical basins with local...

...Clay S. Bell; Timothy Vaughn; Daniel Zimmerle; Detlev Helmig; Brian Lamb Twelve next generation emission measurement (NGEM) technologies completed single-blind testing at the Methane Emissions Technology Evaluation Center in 2018. This is the first series of tests to evaluate a wide variety of NGEM...

...Geoffrey S. Roest; Gunnar W. Schade; Detlev Helmig; Stefan Schwietzke The Eagle Ford Shale in southern Texas remains one of the most productive oil and gas regions in the US. Like the Permian Basin and Bakken Shale, ubiquitous natural gas flaring serves as an uncertain source of trace gas emissions...

...Seth N. Lyman; Trang Tran; Marc L. Mansfield; Arvind P. Ravikumar; Detlev Helmig; Brian Lamb We deployed a helicopter with an infrared optical gas imaging camera to detect hydrocarbon emissions from 3,428 oil and gas facilities (including 3,225 producing oil and gas well pads) in Utah’s Uinta Basin...

...C. S. Foster; E. T. Crosman; J. D. Horel; S. Lyman; B. Fasoli; R. Bares; J. C. Lin; Detlev Helmig; Brian Lamb This study presents a meteorologically-based methodology for quantifying basin-scale methane (CH 4 ) emissions in Utah’s Uintah Basin, which is home to over 9,000 active and producing oil...

... between top-down and bottom-up estimates of regional natural gas (NG) methane (CH 4 ) emissions. In situ mobile downwind measurements are used to document the ethane to methane enhancement ratios (ERs) in emission plumes from NG operations in the region. Enhancement ratios are low (<2% for 87% of NG...

... a “production cluster” infrastructure with extraction, some processing and storage in a single facility. This region is also the site of intensive agriculture and cattle operations. We present results from a multi-scale measurement campaign of methane emissions, including ground and airborne-based estimates...

... factorization (NMF) analysis revealed six consistent source factors, of which two were associated with pre-existing local sources from car traffic and industry, three with regional oil and gas exploration, and one with diesel emissions. The dominant source factors were associated with evaporative and fugitive...

... National Science Foundation grants: OPP-ANT-9813061, OPP-ANT-0423595, and OPP-1115245. The authors have no competing interests to declare. McMurdo Dry Valleys management fossil fuels emissions carbon dynamics nitrogen science activites helicopter Antarctica remains the most...

...Brian Nathan; Thomas Lauvaux; Jocelyn Turnbull; Kevin Gurney; Detlev Helmig; Lori Bruhwiler Current bottom up estimates of CO 2 emission fluxes are based on a mixture of direct and indirect flux estimates relying to varying degrees on regulatory or self-reported data. Hence, it is important to use...

... emissions at 268 gas production facilities in the Fayetteville shale gas play using onsite measurements (261 facilities) and two downwind methods – the dual tracer flux ratio method (Tracer Facility Estimate – TFE, 17 facilities) and the EPA Other Test Method 33a (OTM33A Facility Estimate – OFE, 50...

... measured methane emissions data are available. This study performed leak detection and measurement on 96 km of gathering pipeline and the associated 56 pigging facilities and 39 block valves. The study found one underground leak accounting for 83% (4.0 kg CH 4 /hr) of total measured emissions. Methane...