| Literature DB >> 32606484 |
Siyuan Wang1,2, Eric C Apel2, Rebecca S Hornbrook2, Alan Hills2, Louisa K Emmons2, Simone Tilmes2,3, Jean-François Lamarque2,3, Jose L Jimenez4,5, Pedro Campuzano-Jost4,5, Benjamin A Nault4,5, John D Crounse6, Paul O Wennberg6, Thomas B Ryerson7, Chelsea R Thompson5,7, Jeff Peischl5,7, Fred Moore7, David Nance7, Brad Hall7, James Elkins7, David Tanner8, L Gregory Huey8, Samuel R Hall2, Kirk Ullmann2, John J Orlando2, Geoff S Tyndall2, Frank M Flocke2, Eric Ray7, Thomas F Hanisco9, Glenn M Wolfe9,10, Jason St Clair9,10, Róisín Commane11,12, Bruce Daube11, Barbara Barletta13, Donald R Blake13, Bernadett Weinzierl14, Maximilian Dollner14, Andrew Conley2, Francis Vitt2, Steven C Wofsy11, Daniel D Riemer15.
Abstract
We report airborne measurements of acetaldehyde (CH3CHO) during the first and second deployments of the National Aeronautics and Space Administration (NASA) Atmospheric Tomography Mission (ATom). The budget of CH3CHO is examined using the Community Atmospheric Model with chemistry (CAM-chem), with a newly-developed online air-sea exchange module. The upper limit of the global ocean net emission of CH3CHO is estimated to be 34 Tg a-1 (42 Tg a-1 if considering bubble-mediated transfer), and the ocean impacts on tropospheric CH3CHO are mostly confined to the marine boundary layer. Our analysis suggests that there is an unaccounted CH3CHO source in the remote troposphere and that organic aerosols can only provide a fraction of this missing source. We propose that peroxyacetic acid (PAA) is an ideal indicator of the rapid CH3CHO production in the remote troposphere. The higher-than-expected CH3CHO measurements represent a missing sink of hydroxyl radicals (and halogen radical) in current chemistry-climate models.Entities:
Year: 2019 PMID： 32606484 PMCID： PMC7325730 DOI： 10.1029/2019GL082034
Source DB: PubMed Journal: Geophys Res Lett ISSN： 0094-8276 Impact factor: 4.720