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Atmospheric Acetaldehyde: Importance of Air-Sea Exchange and a Missing Source in the Remote Troposphere.


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.

SUBMITTER: Wang S 

PROVIDER: S-EPMC7325730 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature

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Atmospheric Acetaldehyde: Importance of Air-Sea Exchange and a Missing Source in the Remote Troposphere.

Wang Siyuan S   Apel Eric C EC   Hornbrook Rebecca S RS   Hills Alan A   Emmons Louisa K LK   Tilmes Simone S   Lamarque Jean-François JF   Jimenez Jose L JL   Campuzano-Jost Pedro P   Nault Benjamin A BA   Crounse John D JD   Wennberg Paul O PO   Ryerson Thomas B TB   Thompson Chelsea R CR   Peischl Jeff J   Moore Fred F   Nance David D   Hall Brad B   Elkins James J   Tanner David D   Gregory Huey L L   Hall Samuel R SR   Ullmann Kirk K   Orlando John J JJ   Tyndall Geoff S GS   Flocke Frank M FM   Ray Eric E   Hanisco Thomas F TF   Wolfe Glenn M GM   St Clair Jason J   Commane Róisín R   Daube Bruce B   Barletta Barbara B   Blake Donald R DR   Weinzierl Bernadett B   Dollner Maximilian M   Conley Andrew A   Vitt Francis F   Wofsy Steven C SC   Riemer Daniel D DD  

Geophysical research letters 20190429 10


We report airborne measurements of acetaldehyde (CH<sub>3</sub>CHO) during the first and second deployments of the National Aeronautics and Space Administration (NASA) Atmospheric Tomography Mission (ATom). The budget of CH<sub>3</sub>CHO 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 CH<sub>3</sub>CHO is estimated to be 34 Tg a<sup>-1</sup> (42 Tg a<sup>-1</su  ...[more]

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