An overview of the Fires, Asian, and Stratospheric Transport - Las - PowerPoint PPT Presentation

An overview of the Fires, Asian, and Stratospheric Transport - Las Vegas Ozone Study 2017 ( FAST -LVOS) 2013 Where does the high springtime ozone in the Southwest come from? Angel Peak Andrew O. Langford NOAA/ESRL Chemical Sciences Division NOAA ESRL Global Monitoring Annual Conference 2018 CSD: Ken Aikin, Raul Alvarez, Tim Bonin, Alan Brewer, Steve Brown, Zach Decker, Bill Dubé, Dorothy Fibiger, Guillaume Kirgis, Richard Marchbanks, Jeff Peischl, Tom Ryerson, Scott Sandberg, Christoph Senff, Ann Weickmann, Michael Zucker GMD : Patrick Cullis, Bryan Johnson, Chance Sterling, Irina Petropavlovskikh SciAv : Steve Conley , Zaheer Kamal, Justin Pifer, Dani Caputi CCDAQ : Paul Fransioli, Rodney Langston, Zheng Li, Mick Turner GFDL : Meiyun Lin and Alex Zhang

Surface ozone often exceeds the NAAQS in parts of the rural West during late spring and early summer Las Vegas MDA8 O 3 Jean May 23, 2013 Mojave Desert Airnowtech.org Jean O 3 monitor May-June 35 km SW of Las Vegas 300 km NE of Los Angeles 70 ppbv Jean, Clark County, NV Daily max 8-h ozone (MDA8) GMAC 2018 AOL 2 of 9

L as V egas O zone S tudy ( LVOS ) May 19 - June 29, 2013 TOPAZ lidar and in situ CO and O 3 on Angel Peak 45 km NW of Las Vegas at 2.7 km asl (8680 ft) Las Vegas TOPAZ Angel Peak Clark County Death Valley NAAQS exceeded in the Las Vegas Valley after high O 3 layers pass over Angel Peak GMAC 2018 AOL 3 of 9

Fires, Asian, and Stratospheric Transport - Las Vegas Ozone Study ( FAST -LVOS) May 17 - June 30, 2017 *Joe Neal NOAA/ESRL/GMD ozonesondes D. Caputi (O 3 , Angel Peak T, RH, NOAA/ESRL/CSD winds) mobile lab R. Langston (O 3 , CO, CO 2 , *IOPs only June 18, 2016 CH 4 , NO, NO 2 , NLVA NO y , N 2 O, H 2 O) NOAA/ESRL/CSD TOPAZ lidar Doppler lidar CCDAQ profiler G. Kirgis A. Langford *NLVA-Jean-Barstow-Big Bear Scientific Aviation Mooney (O 3 , NO 2 , CH 4 , C 2 H 6 , H 2 O) GMAC 2018 AOL 4 of 9

FAST -LVOS Measurements (May 17 - June 30, 2017) TOPAZ (523 hours on 45 days) µ-Doppler lidar (45 days) Scientific Aviation CSD ML up to 5 km! CSD (90 hours/14 days) G. Kirgis June 18, 2016 Ozonesondes (30 sondes/14 days) SA Angel Peak in situ (41 days, 6 mobile) CSD GMD 270 ppbv! 6 hour flight plan GMAC 2018 AOL 5 of 9

Example 1: Entrainment of Holcomb Fire plume June 22, 2017 Angel Peak TOPAZ AirNow NOAA HYSPLIT -24 h 70-80 ppbv Ozone 1000 PDT AP Holcomb Fire 1800 PDT AP No visible Aerosol smoke! Holcomb Fire 2.7 ± 0.5 km ASL 1503 acres near Big Bear: June 19 - July 13, 2017 GMAC 2018 AOL 6 of 9

Example 2: Entrainment of Asian pollution plume June 28, 2017 GMAC 2018 AOL 07 of 9 O 3 sondes Ozone O 3 CH 4 RH CH 4 and O 3 in plume Convective mixing Wind shift Aircraft Aerosol No smoke MLH (Doppler) Mixed layer captures O 3 /CH 4 -rich pollution plume transported over Sierra Nevada

Example 3: Entrainment of deep Stratospheric intrusion June 11-12, 2017 (24 of 60 hours shown) GMAC 2018 AOL 08 of 9 O 3 sondes GMD ozonesondes Wind-driven mixing Ozonesondes have greater range and also measure T, RH, and winds In situ measurements Scientific Aviation flight track (flight cut short because of winds) Entrainment of UTLS air increased surface ozone to ≈60 -65 ppbv in the Las Vegas Valley

Summary Entrainment of transported O 3 (fires, Asian, CA, STT) directly observed. • Deep mixed mixed layers entrain transport layers and vent locally produced O 3. • Stratospheric intrusions can indirectly cause high surface O 3 by capping ML. • GMAC 2018 AOL 9 of 9