Methane emissions from residential natural gas meter set assemblies.

Residential natural gas meter set assemblies (MSAs) emit methane (CH), but reported emissions factors vary. To test existing emissions factors, we quantified CH emissions from 37 residential MSAs in Calgary, Alberta, Canada. A notable difference with previous studies is the targeted measurement of regulator vents in this study, which were measured with a static chamber, while fugitives were measured with a modified hi-flow sampler.

Global observational coverage of onshore oil and gas methane sources with TROPOMI.

Satellite observations have been used to measure methane (CH) emissions from the oil and gas (O&G) industry, particularly by revealing previously undocumented, very large emission events and basin-level emission estimates. However, most satellite systems use passive remote sensing to retrieve CH mixing ratios, which is sensitive to sunlight, earth surface properties, and atmospheric conditions. Accordingly, the reliability of satellites for routine CH emissions monitoring varies across the globe.

A Comparison of Multiple Odor Source Localization Algorithms.

There are two primary algorithms for autonomous multiple odor source localization (MOSL) in an environment with turbulent fluid flow: Independent Posteriors (IP) and Dempster-Shafer (DS) theory algorithms. Both of these algorithms use a form of occupancy grid mapping to map the probability that a given location is a source. They have potential applications to assist in locating emitting sources using mobile point sensors.

Weather constraints on global drone flyability.

Small aerial drones are used in a growing number of commercial applications. However, drones cannot fly in all weather, which impacts their reliability for time-sensitive operations. The magnitude and global variability of weather impact is poorly understood.