Stratospheric contribution to surface ozone in the desert Southwest during the 2013 Las Vegas Ozone Study

Monday, 15 December 2014: 4:15 PM
Andrew O'Neil Langford1, Christoph J Senff2, Raul J Alvarez II1, Jerome F Brioude2, Owen Roger Cooper2, John S Holloway2, Meiyun Lin3, Richard Marchbanks2, R. Bradley Pierce4, Patrick J Reddy5, Scott Sandberg1, Ann M Weickmann2, Eric J Williams1, Mae Sexauer Gustin6, Laura T Iraci7, Thierry Leblanc8 and Emma L Yates7, (1)NOAA ESRL, Boulder, CO, United States, (2)CIRES/NOAA Earth Systems Lab, Boulder, CO, United States, (3)Princeton University, Program in Atmospheric and Oceanic Sciences, Princeton, NJ, United States, (4)NOAA/NESDIS, Center for Satellite Application and Research, Madison, WI, United States, (5)APCD-TSP-B1, Denver, CO, United States, (6)University of Nevada-Reno, Reno, NV, United States, (7)NASA Ames Research Center, Moffett Field, CA, United States, (8)NASA Jet Propulsion Laboratory, Table Mountain Facility, Pasadena, CA, United States
The 2013 Las Vegas Ozone Study (LVOS) was designed to investigate the potential impact of stratosphere-troposphere transport (STT) and long-range transport of pollution from Asia on surface O3 concentrations in Clark County, NV. This measurement campaign, which took place in May and June of 2013, was conducted at Angel Peak, NV, a high elevation site about 2.8 km above mean sea level and 45 km west of Las Vegas. The study was organized around the NOAA ESRL truck-based TOPAZ scanning ozone lidar with collocated in situ sampling of O3, CO, and meteorological parameters. These measurements were supported by the NOAA/NESDIS real time modelling system (RAQMS), FLEXPART particle dispersion model, and the NOAA GFDL AM3 model. In this talk, I will describe one of several STT events that occurred during the LVOS campaign. This intrusion, which was profiled by TOPAZ on the night of May 24-25, was also sampled by the NASA Alpha Jet, the Table Mountain ozone lidar, and by an ozonesonde flying above southern California. This event also led to significant ozone increases at surface monitors operated by Clark County, the California Air Resources Board, the U.S. National Park Service, and the Nevada Rural Ozone Initiative (NRVOI), and resulted in exceedances of the 2008 75 ppbv O3 NAAQS both in Clark County and in surrounding areas of Nevada and southern California. The potential implications of this and similar events for air quality compliance in the western U.S. will be discussed.