Ammonia sources in the California South Coast Air Basin and their impact on ammonium nitrate formation

Details Ammonia sources in the California South Coast Air Basin and their impact on ammonium nitrate formation Ammonia sources in the California South Coast Air Basin and their impact on ammonium nitrate formation

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3907804n&link_type=abstract

Geophysical Research Letters, Volume 39, Issue 7, CiteID L07804

Physics

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, 4325), Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Biogeosciences: Agricultural Systems

Scientific paper

Observations from the NOAA WP-3D aircraft during CalNex in May and June 2010 are used to quantify ammonia (NH3) emissions from automobiles and dairy facilities in the California South Coast Air Basin (SoCAB) and assess their impact on particulate ammonium nitrate (NH4NO3) formation. These airborne measurements in the SoCAB are used to estimate automobile NH3 emissions, 62 ± 24 metric tons day‑1, and dairy facility NH3 emissions, 33 ± 16 to 176 ± 88 metric tons day‑1. Emission inventories agree with the observed automobile NH3:CO emission ratio, but substantially underpredict dairy facility NH3 emissions. Conditions observed downwind of the dairy facilities were always thermodynamically favorable for NH4NO3 formation due to high NH3 mixing ratios from the concentrated sources. Although automobile emissions generated lower NH3 mixing ratios, they also can thermodynamically favor NH4NO3 formation. As an aerosol control strategy, addressing the dairy NH3 source would have the larger impact on reducing SoCAB NH4NO3 formation.

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