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DTSTAMP:20250509T194438Z
DESCRIPTION:Atmospheric and Oceanic Sciences Departmental Seminar Series\n
 \npresents\n\nAmmonia’s Impact on Air Quality and Climate in Agricultural 
 Regions and the Arctic\n\na talk by\n\nJennifer Murphy\n	Professor\,\n	Depar
 tment of Chemistry\, University of Toronto \n\nAtmospheric ammonia (NH3) i
 s an important precursor of particulate formation in atmosphere\, and can 
 impact air quality\, climate and biodiversity. I will discuss field measur
 ements made by my research group over the last five years that we are usin
 g the understand the impact of ammonia on atmospheric composition across a
  range of environments. In the Arctic atmosphere during summer\, we identi
 fied an important role for migratory seabird colonies as a source of ammon
 ia. Due to the relatively pristine atmosphere\, this ammonia was found to 
 exert a large influence on the number of cloud condensation nuclei\, and u
 ltimately on the regional climate forcing. Agricultural activities\, inclu
 ding animal husbandry and fertilizer application\, are the most important 
 sources of ammonia on a global scale. Our aircraft and ground-based measur
 ements in the Utah Winter Fine Particle Study in 2017 indicate that ammoni
 a plays an important role in regulating mass loading of fine particles dur
 ing air quality exceedance events. We find that current emission inventori
 es are biased low\, especially in regions where animal husbandry is the do
 minant source. Our eddy covariance flux measurements of ammonia above fert
 ilized corn fields in the 2017 and 2018 growing seasons indicate that mana
 gement practices and environmental conditions can control the magnitude\, 
 and even direction\, of ecosystem-atmosphere ammonia flux.\n\nMonday Feb 2
 4/ 3:30 PM/ Burnside Hall/ Room 934\n
DTSTART:20200224T203000Z
DTEND:20200224T220000Z
LOCATION:Room 934
SUMMARY:Ammonia’s Impact on Air Quality and Climate in Agricultural Regions
  and the Arctic
URL:/meteo/channels/event/ammonias-impact-air-quality-
 and-climate-agricultural-regions-and-arctic-319648
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