Journal article
Evaluating Summer-Time Ozone Enhancement Events in the Southeast United States
Atmosphere, Vol.7(8), p.108
08/19/2016
DOI: 10.3390/atmos7080108
Abstract
This study evaluates source attribution of ozone (O-3) in the southeast United States (US) within O-3 lamina observed by the University of Alabama in Huntsville (UAH) Tropospheric Ozone Lidar Network (TOLNet) system during June 2013. This research applies surface-level and airborne in situ data and chemical transport model simulations (GEOS-Chem) in order to quantify the impact of North American anthropogenic emissions, wildfires, lightning NOx, and long-range/stratospheric transport on the observed O-3 lamina. During the summer of 2013, two anomalous O-3 layers were observed: (1) a nocturnal near-surface enhancement and (2) a late evening elevated (3-6 km above ground level) O-3 lamina. A "brute force" zeroing method was applied to quantify the impact of individual emission sources and transport pathways on the vertical distribution of O-3 during the two observed lamina. Results show that the nocturnal O-3 enhancement on 12 June 2013 below 3 km was primarily due to wildfire emissions and the fact that daily maximum anthropogenic emission contributions occurred during these night-time hours. During the second case study it was predicted that above average contributions from long-range/stratospheric transport was largely contributing to the O-3 lamina observed between 3 and 6 km on 29 June 2013. Other models, remote-sensing observations, and ground-based/airborne in situ data agree with the source attribution predicted by GEOS-Chem simulations. Overall, this study demonstrates the dynamic atmospheric chemistry occurring in the southeast US and displays the various emission sources and transport processes impacting O-3 enhancements at different vertical levels of the troposphere.
Details
- Title: Subtitle
- Evaluating Summer-Time Ozone Enhancement Events in the Southeast United States
- Creators
- Matthew S. Johnson - Ames Research CenterShi Kuang - University of Alabama in HuntsvilleLihua Wang - University of Alabama in HuntsvilleM. J. Newchurch - University of Alabama in Huntsville
- Resource Type
- Journal article
- Publication Details
- Atmosphere, Vol.7(8), p.108
- Publisher
- Mdpi
- DOI
- 10.3390/atmos7080108
- ISSN
- 2073-4433
- eISSN
- 2073-4433
- Number of pages
- 19
- Grant note
- TOLNet program
- Language
- English
- Date published
- 08/19/2016
- Academic Unit
- Iowa Technology Institute
- Record Identifier
- 9984721217202771
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