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- Title
The Fires, Asian, and Stratospheric Transport –Las Vegas Ozone Study (FAST -LVOS).
- Authors
Langford, Andrew O.; Senff, Christoph J.; Alvarez II, Raul J.; Aikin, Ken C.; Baidar, Sunil; Bonin, Timothy A.; Brewer, W. Alan; Brioude, Jerome; Brown, Steven S.; Burley, Joel D.; Caputi, Dani J.; Conley, Stephen A.; Cullis, Patrick D.; Decker, Zachary C. J.; Evan, Stéphanie; Kirgis, Guillaume; Lin, Meiyun; Pagowski, Mariusz; Peischl, Jeff; Petropavlovskikh, Irina
- Abstract
The Fires, Asian, and Stratospheric Transport–Las Vegas Ozone Study (FAST-LVOS) was conducted in May and June of 2017 to study the transport of ozone (O 3) to Clark County, Nevada, a marginal non-attainment area in the southwestern United States (SWUS). This 6-week (20 May–30 June 2017) field campaign used lidar, ozonesonde, aircraft, and in situ measurements in conjunction with a variety of models to characterize the distribution of O 3 and related species above southern Nevada and neighboring California and to probe the influence of stratospheric intrusions and wildfires as well as local, regional, and Asian pollution on surface O 3 concentrations in the Las Vegas Valley (≈ 900 m above sea level, a.s.l.). In this paper, we describe the FAST-LVOS campaign and present case studies illustrating the influence of different transport processes on background O 3 in Clark County and southern Nevada. The companion paper by Zhang et al. (2020) describes the use of the AM4 and GEOS-Chem global models to simulate the measurements and estimate the impacts of transported O 3 on surface air quality across the greater southwestern US and Intermountain West. The FAST-LVOS measurements found elevated O 3 layers above Las Vegas on more than 75 % (35 of 45) of the sample days and show that entrainment of these layers contributed to mean 8 h average regional background O 3 concentrations of 50–55 parts per billion by volume (ppbv), or about 85–95 µ g m -3. These high background concentrations constitute 70 %–80 % of the current US National Ambient Air Quality Standard (NAAQS) of 70 ppbv (≈ 120 µ g m -3 at 900 m a.s.l.) for the daily maximum 8 h average (MDA8) and will make attainment of the more stringent standards of 60 or 65 ppbv currently being considered extremely difficult in the interior SWUS.
- Subjects
NEVADA; LAS Vegas (Nev.); AIR quality standards; OZONE; SEA level; AIR quality
- Publication
Atmospheric Chemistry & Physics, 2022, Vol 22, Issue 3, p1707
- ISSN
1680-7316
- Publication type
Article
- DOI
10.5194/acp-22-1707-2022