Climate variability modulates western US ozone air quality in spring via deep stratospheric intrusions

Meiyun Lin (), Arlene M. Fiore, Larry W. Horowitz, Andrew O. Langford, Samuel J. Oltmans, David Tarasick and Harald E. Rieder
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Meiyun Lin: Program in Atmospheric and Oceanic Sciences, Princeton University
Arlene M. Fiore: Columbia University
Larry W. Horowitz: NOAA Geophysical Fluid Dynamics Laboratory
Andrew O. Langford: NOAA Earth System Research Laboratory
Samuel J. Oltmans: NOAA Earth System Research Laboratory
David Tarasick: Meteorological Service of Canada, Environment Canada
Harald E. Rieder: Lamont-Doherty Earth-Observatory, Columbia University

Nature Communications, 2015, vol. 6, issue 1, 1-11

Abstract: Abstract Evidence suggests deep stratospheric intrusions can elevate western US surface ozone to unhealthy levels during spring. These intrusions can be classified as ‘exceptional events’, which are not counted towards non-attainment determinations. Understanding the factors driving the year-to-year variability of these intrusions is thus relevant for effective implementation of the US ozone air quality standard. Here we use observations and model simulations to link these events to modes of climate variability. We show more frequent late spring stratospheric intrusions when the polar jet meanders towards the western United States, such as occurs following strong La Niña winters (Niño3.4

Date: 2015
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DOI: 10.1038/ncomms8105

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