Regional NO3- events in the northeastern United States related to seasonal climate anomalies

Details Regional NO3- events in the northeastern United States related to seasonal climate anomalies Regional NO3- events in the northeastern United States related to seasonal climate anomalies

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3216804f&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 16, CiteID L16804

Physics

6

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Pollution: Urban And Regional (0305, 0478, 4251), Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Processes: Synoptic-Scale Meteorology

Scientific paper

We demonstrate a direct connection between anomalously high levels of NO3- in aerosols over the northeastern U.S. with transport of air masses from south of the Great Lakes during periods of unseasonably warm climatic conditions in that area. Previous studies document the predominant and pervasive role of SO42- and organic matter in regional aerosol composition over the Northeast. Here we characterize multi-day episodic events where NO3- exceeded SO42- by up to 3-fold at Mount Washington and increased from the seasonal median of about 1 nmol m-3 to 60-100 nmol m-3. These events take place in the colder seasons, with the three most significant ones in the last 6 years occurring in November 2001, January 2002, and March 2004. We propose that large amounts of NH3 are volatilized in the Midwest under these conditions, which exceeds available SO42- and allows high levels of NH4NO3 aerosol to form. The occurrence of these events, which completely changes the character of aerosols over the Northeast and may lead to enhanced NO3- deposition to ecosystems, could increase with continued warming over North America.

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