Rain-induced turbulence and air-sea gas transfer


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dc.contributor.author Zappa, Christopher J.
dc.contributor.author Ho, David T.
dc.contributor.author McGillis, Wade R.
dc.contributor.author Banner, Michael L.
dc.contributor.author Dacey, John W. H.
dc.contributor.author Bliven, Larry F.
dc.contributor.author Ma, Barry
dc.contributor.author Nystuen, Jeffrey A.
dc.date.accessioned 2010-07-21T18:42:06Z
dc.date.available 2010-07-21T18:42:06Z
dc.date.issued 2009-07-09
dc.identifier.citation Journal of Geophysical Research 114 (2009): C07009 en_US
dc.identifier.uri http://hdl.handle.net/1912/3815
dc.description Author Posting. © American Geophysical Union, 2009. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 114 (2009): C07009, doi:10.1029/2008JC005008. en_US
dc.description.abstract Results from a rain and gas exchange experiment (Bio2 RainX III) at the Biosphere 2 Center demonstrate that turbulence controls the enhancement of the air-sea gas transfer rate (or velocity) k during rainfall, even though profiles of the turbulent dissipation rate ɛ are strongly influenced by near-surface stratification. The gas transfer rate scales with ɛ inline equation for a range of rain rates with broad drop size distributions. The hydrodynamic measurements elucidate the mechanisms responsible for the rain-enhanced k results using SF6 tracer evasion and active controlled flux technique. High-resolution k and turbulence results highlight the causal relationship between rainfall, turbulence, stratification, and air-sea gas exchange. Profiles of ɛ beneath the air-sea interface during rainfall, measured for the first time during a gas exchange experiment, yielded discrete values as high as 10−2 W kg−1. Stratification modifies and traps the turbulence near the surface, affecting the enhancement of the transfer velocity and also diminishing the vertical mixing of mass transported to the air-water interface. Although the kinetic energy flux is an integral measure of the turbulent input to the system during rain events, ɛ is the most robust response to all the modifications and transformations to the turbulent state that follows. The Craig-Banner turbulence model, modified for rain instead of breaking wave turbulence, successfully predicts the near-surface dissipation profile at the onset of the rain event before stratification plays a dominant role. This result is important for predictive modeling of k as it allows inferring the surface value of ɛ fundamental to gas transfer. en_US
dc.description.sponsorship This work was funded by a generous grant from the David and Lucile Packard Foundation and the Lamont-Doherty Earth Observatory Climate Center. Additional funding was provided by the National Science Foundation (OCE-05-26677) and the Office of Naval Research Young Investigator Program (N00014-04-1-0621). en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2008JC005008
dc.subject Turbulence en_US
dc.subject Rain en_US
dc.subject Gas transfer en_US
dc.title Rain-induced turbulence and air-sea gas transfer en_US
dc.type Article en_US
dc.identifier.doi 10.1029/2008JC005008

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