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    Sorption behavior of formaldehyde to ice grains

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    Author
    Burkhart, John F.
    Issue Date
    2000
    Advisor
    Bales, Roger C.
    
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    The equilibritun partitioning of fonnaldehyde between air and snow was studied in a senes of laboratory experitnents conducted at -S"C, -15"C and -35()C, with the intention of developing a quantitative relationship of the ternperature dependence of the bulk partitioning transfer coefficient, K0 , for fonnaldehyde in polar snow. The results of the experitnents it1dicate that the original field based paratneterization of the n1odel does use realistic values for both the partitioning coefficient, K0 , and the pseudo-fust order transfer rate coefficient, k1 ,. Measurements of K0 were 1.75, 1.97, and 2.39 (Log 1nol L-1 atm-) for -5°C, -15oC and -35()C, respectively. Estitnates of k1 , for the satne three tetnperatures in units of s-1 were 4.11 x 10-4, 1.07 x 10-4, and 1.08 x 1 o s, respectively. Attnospheric tneasuretnents of fonnaldehyde in polar regions reveal concentrations that are higher than predicted frotn current 1nodelll1g. Additionally, firn and firn-air concentrations of fonnaldehyde i11 the polar snow pack have been observed to have a unique profile of preserved concentrations that are not consistent with other reversibly deposited species. These experitnents help to further define the behavior of fonnaldehyde sorption to ice, and the preservation of it in the snow. It has been shown that fonnaldehyde observations it1 fun can be 1nodeled solely through the use of a parameterized tnodel of tetnperature dependent sorption
    Type
    text
    Thesis-Reproduction (electronic)
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Hydrology and Water Resources
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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