Abstract

Recently, two air quality campaigns were conducted in the southwestern United States to study the impact of transported ozone, stratospheric intrusions, and fire emissions on ground-level ozone concentrations. The California Baseline Ozone Transport Study (CABOTS) took place in May – August 2016 covering the central California coast and San Joaquin Valley, and the Fires, Asian, and Stratospheric Transport Las Vegas Ozone Study (FAST-LVOS) was conducted in the greater Las Vegas, Nevada area in May – June 2017. During these studies, nearly 1000 hours of ozone and aerosol profile data were collected with the NOAA TOPAZ lidar. A Doppler wind lidar and a radar wind profiler provided continuous observations of atmospheric turbulence, horizontal winds, and mixed layer height. These measurements allowed us to directly observe the degree to which ozone transport layers aloft were entrained into the boundary layer and to quantify the resulting impact on surface ozone levels. Mixed layer heights in the San Joaquin Valley during CABOTS were generally below 1 km above ground level (AGL), while boundary layer heights in Las Vegas during FAST-LVOS routinely exceeded 3 km AGL and occasionally reached up to 4.5 km AGL. Consequently, boundary layer entrainment was more often observed during FAST-LVOS, while most elevated ozone layers passed untapped over the San Joaquin Valley during CABOTS.

Highlights

  • METHODOLOGY 7KH 12$$ (65/ &KHPLFDO 6FLHQFHV 'LYLVLRQ &6' WUXFNEDVHG 7XQDEOH 2SWLFDO 3URILOHU IRU $HURVROVDQGR=RQH 723$= OLGDU>@ )LJXUH ZDV D NH\ FRPSRQHQW RI ERWK VWXGLHV DQG ZDV GHSOR\HGDWWKH9LVDOLD0XQLFLSDO$LUSRUW 90$

  • )LJXUH 'LVWULEXWLRQ RI REVHUYHG DIWHUQRRQ PL[HG OD\HUKHLJKWVDW90$GXULQJ&$%276 IURP6-9$3&' UDGDU5$66GDUNEOXHIURP0LFUR'RSSOHUOLGDUOLJKW EOXH DQG GXULQJ )$67/926 IURP 0LFUR'RSSOHUOLGDUUHG

  • )LJXUH 723$=R]RQHSURILOHV REVHUYHGRQ-XO\ GXULQJ&$%2765DGDU5$66PL[HGOD\HUKHLJKWV EODFN OLQH DQG ZLQG DUURZV DUH RYHUODLG ERWWRP SDQHO

Read more

Summary

Introduction

METHODOLOGY 7KH 12$$ (65/ &KHPLFDO 6FLHQFHV 'LYLVLRQ &6' WUXFNEDVHG 7XQDEOH 2SWLFDO 3URILOHU IRU $HURVROVDQGR=RQH 723$= OLGDU>@ )LJXUH ZDV D NH\ FRPSRQHQW RI ERWK VWXGLHV DQG ZDV GHSOR\HGDWWKH9LVDOLD0XQLFLSDO$LUSRUW 90$

Results
Conclusion

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.