Weakening of the weekend ozone effect over California's South Coast Air Basin

Details

• Journal Title:
  Geophysical Research Letters
• Personal Author:
  Baidar, S. ; Hardesty, R. M. ; Kim, S.-W. ; Langford, A. O. ; Oetjen, H. ; Senff, C. J. ; Trainer, M. ; Volkamer, R.
• NOAA Program & Office:
  OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CSL (Chemical Sciences Laboratory)
• Description:
  We have observed lower nitrogen dioxide (NO2) and ozone (O-3) during a hot weekend (summer 2010) from aircraft over the entire South Coast Air Basin (SoCAB). Surface concentrations of NO2, O-3, and temperature from 1996 to 2014 corroborate that this lower O-3 on weekends is increasingly likely in recent years. While higher surface O-3 on the weekends (weekend ozone effect, WO3E) remains widespread, the spatial extent and the trend in the probability of WO3E occurrences (P-WO3E) have decreased significantly compared to a decade ago. This decrease is mostly the result of lower O-3 on hot weekends in recent years. P-WO3E is lowest in the eastern SoCAB. The major decrease happened during the 2008 economic recession, after which P-WO3E has stabilized at a 15-25% lower level throughout most of the basin. Future NOx reductions are likely to be increasingly effective at reducing O-3 pollution initially under hot conditions in the coming decade.
• Source:
  Geophysical Research Letters, 42(21), 9457-9464.
• DOI:
  https://doi.org/10.1002/2015gl066419
• Document Type:
  Journal Article
• Rights Information:
  Other
• Compliance:
  Submitted
• Main Document Checksum:
  urn:sha256:2c659e14e971cd578859b84bfc634fc9632cf28a7d566414ded51312f3c59dd7
• Download URL:
  https://repository.library.noaa.gov/view/noaa/21473/noaa_21473_DS1.pdf
• File Type:
  [PDF - 936.36 KB ]