An Assessment of Ground Level and Free Tropospheric Ozone Over California and Nevada

Yates, E. L.; Johnson, M. S.; Iraci, L. T.; Ryoo, J.-M.; Pierce, R. B.; Cullis, P. D.; Gore, W.; Ives, M. A.; Johnson, B. J.; Leblanc, T.; Marrero, J. E.; Sterling, C. W.; Tanaka, T.

doi:10.1002/2016jd026266

i

An Assessment of Ground Level and Free Tropospheric Ozone Over California and Nevada

2017
By Yates, E. L. ; Johnson, M. S. ; Iraci, L. T. ; ...

Details

Journal Title:

Journal of Geophysical Research: Atmospheres
Personal Author:

Yates, E. L. ; Johnson, M. S. ; Iraci, L. T. ; Ryoo, J.-M. ; Pierce, R. B. ; Cullis, P. D. ; Gore, W. ; Ives, M. A. ; Johnson, B. J. ; Leblanc, T. ; Marrero, J. E. ; Sterling, C. W. ; Tanaka, T.
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; GML (Global Monitoring Laboratory) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; NESDIS (National Environmental Satellite, Data, and Information Service) ; STAR (Center for Satellite Applications and Research)
Description:

Increasing free tropospheric ozone (O-3), combined with the high elevation and often deep boundary layers at western U.S. surface stations, poses challenges in attaining the more stringent 70 ppb O-3 National Ambient Air Quality Standard. As such, use of observational data to identify sources and mechanisms that contribute to surface O-3 is increasingly important. This work analyzes surface and vertical O-3 observations over California and Nevada from 1995 to 2015. Over this period, the number of high O-3 events (95th percentile) at the U.S. Environmental Protection Agency Clean Air Status and Trends Network (CASTNET) sites has decreased during summer, as a result of decreasing U.S. emissions. In contrast, an increase in springtime 5th percentile O-3 indicates a general increase of baseline O-3. During 2012 there was a peak in exceedances and in the average spring-summer O-3 mixing ratios at CASTNET sites. Goddard Earth Observing System-Chem results show that the surface O-3 attributable to transport from the upper troposphere and stratosphere was increased in 2013 compared to 2012, highlighting the importance of measurements aloft. Vertical O-3 measurements from aircraft, ozonesondes, and lidar show distinct seasonal trends, with a high percentage of elevated O-3 laminae (O-3 > 70 ppb, 3-8 km) during spring and summer. Analysis of the timing of high O-3 surface events and correlation between surface and vertical O-3 data is used to discuss varying sources of western U.S. surface O-3.
Source:

Journal of Geophysical Research-Atmospheres, 122(18), 10089-10102.
DOI:

https://doi.org/10.1002/2016jd026266
Document Type:

Journal Article
Rights Information:

Public Domain
Compliance:

Submitted
Main Document Checksum:

urn:sha-512:115ac3d8c10fc80fb17ec2f981d48ecda948443d6c077e4d7b44d984d3ef139a1d3e3ff1c9c3ae6862ed164be77d30a78ee38abf63fcfcf2fa25e1ff1c4e2af2
Download URL:

https://repository.library.noaa.gov/view/noaa/22392/noaa_22392_DS1.pdf
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[PDF - 1.15 MB ]

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