Interannual Variability in Baseline Ozone and Its Relationship to Surface Ozone in the Western U.S

Environmental Science & Technology
Pao M BaylonMae S Gustin

Abstract

Baseline ozone refers to observed concentrations of tropospheric ozone at sites that have a negligible influence from local emissions. The Mount Bachelor Observatory (MBO) was established in 2004 to examine baseline air masses as they arrive to North America from the west. In May 2012, we observed an O3 increase of 2.0-8.5 ppbv in monthly average maximum daily 8-hour average O3 mixing ratio (MDA8 O3) at MBO and numerous other sites in the western U.S. compared to previous years. This shift in the O3 distribution had an impact on the number of exceedance days. We also observed a good correlation between daily MDA8 variations at MBO and at downwind sites. This suggests that under specific meteorological conditions, synoptic variation in O3 at MBO can be observed at other surface sites in the western U.S. At MBO, the elevated O3 concentrations in May 2012 are associated with low CO values and low water vapor values, consistent with transport from the upper troposphere/lower stratosphere (UT/LS). Furthermore, the Real-time Air Quality Modeling System (RAQMS) analyses indicate that a large flux of O3 from the UT/LS in May 2012 contributed to the observed enhanced O3 across the western U.S. Our results suggest that a network of mount...Continue Reading

References

Jul 30, 2004·American Journal of Respiratory and Critical Care Medicine·Alexandros GryparisZeynep Dörtbudak
Apr 4, 2006·Environmental Health Perspectives·Michelle L BellFrancesca Dominici
Sep 5, 2008·Environmental Science & Technology·Dan JaffeDominick Spracklen
Dec 15, 2010·Environmental Science & Technology·Dan Jaffe
Oct 12, 2011·Environmental Science & Technology·Elena C McDonald-BullerLin Zhang
Apr 5, 2015·The Science of the Total Environment·Mae Sexauer GustinJoel Burley

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Citations

Sep 23, 2016·Proceedings of the National Academy of Sciences of the United States of America·Mang LinMark H Thiemens
Oct 27, 2018·Elementa : Science of the Anthropocene·Daniel A JaffTom Moore

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