ACOM Seminar - Jenny Fisher

Impacts of organic nitrates on the NOx budget:
Insights from aircraft observations and chemical transport modeling

Dr. Jenny Fisher
School of Earth & Environmental Sciences and
Centre for Atmospheric Chemistry (School of Chemistry)
University of Wollongong, NSW, Australia

Formation of organic alkyl nitrates (RONO2) during oxidation of volatile organic compounds (VOC) significantly impacts the atmospheric distribution and lifetime of nitrogen oxide radicals (NOx), key precursors for tropospheric ozone production. RONO2 formed from biogenic VOC precursors tend to have short atmospheric lifetimes against deposition and aerosol uptake, and can therefore serve as an important sink for NOx, particularly in regions where NOx emissions are already low. Meanwhile, short-chain RONO2 derived from anthropogenic VOCs (e.g., methane, ethane, and propane) have lifetimes of weeks to months and are therefore potentially important reservoir species that could serve to export NOx from major source regions to the NOx-limited remote troposphere. However, the chemistry, budgets, and NOx impacts of both anthropogenic- and biogenic-derived RONO2 remain uncertain. In this talk, I will describe implementation of a new RONO2 chemical scheme in the GEOS-Chem global chemical transport model and its evaluation against a range of recent and historic aircraft campaigns across the world. I will use the new simulation combined with newly available measurements to identify the precursors responsible for observed RONO2. Finally, I will use the model to quantify the impacts of RONO2 formation (and resultant NOx removal, export, and/or release) on the NOx budget in diverse environments.

 Monday, April 24, 2017
3:30 p.m.
Refreshments 3:15 p.m.
NCAR Foothills Laboratory, FL2-1022, Large Auditorium
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Announcement Timing: 
April 17, 2017 to April 24, 2017
Calendar Timing: 
Monday, April 24, 2017 - 3:30pm to 5:00pm