| Title: | Microlayer source of oxygenated volatile organic compounds in the summertime marine Arctic boundary layer |
| Author(s): | Mungall EL; Abbatt JPD; Wentzell JJB; Lee AKY; Thomas JL; Blais M; Gosselin M; Miller LA; Papakyriakou T; Willis MD; Liggio J; |
| Address: | "Department of Chemistry, University of Toronto, Toronto, ON, Canada ON M5S 3H6. Department of Chemistry, University of Toronto, Toronto, ON, Canada ON M5S 3H6; jabbatt@chem.utoronto.ca. Air Quality Processes Research Section, Environment Canada, Toronto, ON, Canada M3H 5T4. Department of Civil and Environmental Engineering, National University of Singapore, Singapore 117576. Sorbonne Universites, Pierre and Marie Curie University, Universite Versailles St-Quentin, CNRS, Institut National des Sciences de l'Univers, Laboratoire Atmospheres, Milieux, Observations Spatiales, Institut Pierre Simon Laplace, 75252 Paris, France. Institut des Sciences de la Mer de Rimouski (Quebec-Ocean), Universite du Quebec a Rimouski, Rimouski, QC, Canada G5L 3A1. Institute of Ocean Sciences, Fisheries and Oceans Canada, Sidney, BC, Canada V8L 4B2. Centre for Earth Observation Science, Faculty of Environment, Earth and Resources, University of Manitoba, Winnipeg, MB, Canada R3T 2N2" |
| ISSN/ISBN: | 1091-6490 (Electronic) 0027-8424 (Print) 0027-8424 (Linking) |
| Abstract: | "Summertime Arctic shipboard observations of oxygenated volatile organic compounds (OVOCs) such as organic acids, key precursors of climatically active secondary organic aerosol (SOA), are consistent with a novel source of OVOCs to the marine boundary layer via chemistry at the sea surface microlayer. Although this source has been studied in a laboratory setting, organic acid emissions from the sea surface microlayer have not previously been observed in ambient marine environments. Correlations between measurements of OVOCs, including high levels of formic acid, in the atmosphere (measured by an online high-resolution time-of-flight mass spectrometer) and dissolved organic matter in the ocean point to a marine source for the measured OVOCs. That this source is photomediated is indicated by correlations between the diurnal cycles of the OVOC measurements and solar radiation. In contrast, the OVOCs do not correlate with levels of isoprene, monoterpenes, or dimethyl sulfide. Results from box model calculations are consistent with heterogeneous chemistry as the source of the measured OVOCs. As sea ice retreats and dissolved organic carbon inputs to the Arctic increase, the impact of this source on the summer Arctic atmosphere is likely to increase. Globally, this source should be assessed in other marine environments to quantify its impact on OVOC and SOA burdens in the atmosphere, and ultimately on climate" |
| Keywords: | Arctic chemical ionization mass spectrometry marine boundary layer oxygenated volatile organic compounds sea surface microlayer; |
| Notes: | "PubMed-not-MEDLINEMungall, Emma L Abbatt, Jonathan P D Wentzell, Jeremy J B Lee, Alex K Y Thomas, Jennie L Blais, Marjolaine Gosselin, Michel Miller, Lisa A Papakyriakou, Tim Willis, Megan D Liggio, John eng Research Support, Non-U.S. Gov't 2017/06/01 Proc Natl Acad Sci U S A. 2017 Jun 13; 114(24):6203-6208. doi: 10.1073/pnas.1620571114. Epub 2017 May 30" |
