The Nevada rural ozone initiative (NVROI)

insights to understanding air pollution in complex terrain

Mae Sexauer Gustin*, Rebekka Fine, Matthieu Miller, Dan Jaffe, Joel Burley

*Corresponding author for this work

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The Nevada Rural Ozone Initiative (NVROI) was established to better understand O3 concentrations in the Western United States (US). The major working hypothesis for development of the sampling network was that the sources of O3 to Nevada are regional and global. Within the framework of this overarching hypothesis, we specifically address two conceptual meteorological hypotheses: (1) The high elevation, complex terrain, and deep convective mixing that characterize Nevada, make this state ideally located to intercept polluted parcels of air transported into the US from the free troposphere; and (2) site specific terrain features will influence O3 concentrations observed at surface sites. Here, the impact of complex terrain and site location on observations are discussed. Data collected in Nevada at 6 sites (1385 to 2082m above sea level (asl)) are compared with that collected at high elevation sites in Yosemite National Park and the White Mountains, California. Average daily maximum 1-hour concentrations of O3 during the first year of the NVROI ranged from 58 to 69ppbv (spring), 53 to 62ppbv (summer), 44 to 49ppbv (fall), and 37 to 45ppbv (winter). These were similar to those measured at 3 sites in Yosemite National Park (2022 to 3031m asl), and at 4 sites in the White Mountains (1237 to 4342m asl) (58 to 67ppbv (summer) and 47 to 58ppbv (fall)). Results show, that in complex terrain, collection of data should occur at high and low elevation sites to capture surface impacts, and site location with respect to topography should be considered. Additionally, concentrations measured are above the threshold reported for causing a reduction in growth and visible injury for plants (40ppbv), and sustained exposure at high elevation locations in the Western USA may be detrimental for ecosystems.

Original languageEnglish
Pages (from-to)455-470
Number of pages16
JournalScience of the Total Environment
Volume530-531
DOIs
Publication statusPublished - 15 Oct 2015
Externally publishedYes

Keywords

  • Asian pollution
  • long range transport
  • national parks
  • regional air pollution

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