Extensive field evidence for the release of HONO from the photolysis of nitrate aerosols.
Simone T Andersen, Lucy J Carpenter, Chris Reed, James D Lee, Rosie Chance, Tomás Sherwen, Adam R Vaughan, Jordan Stewart, Pete M Edwards, William J Bloss, Roberto Sommariva, Leigh R Crilley, Graeme J Nott, Luis Neves, Katie Read, Dwayne E Heard, Paul W Seakins, Lisa K Whalley, Graham A Boustead, Lauren T Fleming, Daniel Stone, Khanneh Wadinga Fomba
Author Information
Simone T Andersen: Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK. ORCID
Lucy J Carpenter: Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK. ORCID
Chris Reed: FAAM Airborne Laboratory, Cranfield, UK. ORCID
James D Lee: Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK. ORCID
Rosie Chance: Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK. ORCID
Tomás Sherwen: Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK. ORCID
Adam R Vaughan: Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK. ORCID
Jordan Stewart: Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK.
Pete M Edwards: Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UK. ORCID
William J Bloss: School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, UK. ORCID
Roberto Sommariva: School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, UK. ORCID
Leigh R Crilley: School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, UK. ORCID
Particulate nitrate ([Formula: see text]) has long been considered a permanent sink for NO (NO and NO), removing a gaseous pollutant that is central to air quality and that influences the global self-cleansing capacity of the atmosphere. Evidence is emerging that photolysis of [Formula: see text] can recycle HONO and NO back to the gas phase with potentially important implications for tropospheric ozone and OH budgets; however, there are substantial discrepancies in "renoxification" photolysis rate constants. Using aircraft and ground-based HONO observations in the remote Atlantic troposphere, we show evidence for renoxification occurring on mixed marine aerosols with an efficiency that increases with relative humidity and decreases with the concentration of [Formula: see text], thus largely reconciling the very large discrepancies in renoxification photolysis rate constants found across multiple laboratory and field studies. Active release of HONO from aerosol has important implications for atmospheric oxidants such as OH and O in both polluted and clean environments.
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