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Detailed Reference Information |
Huffman, W.A. and Snider, J.R. (2004). Ice-oxyhydrocarbon interactions in the troposphere. Journal of Geophysical Research 109: doi: 10.1029/2003JD003778. issn: 0148-0227. |
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Both surface and volume uptake can contribute to the removal of tropospheric gases by ice-phase precipitation and cloud particles. These processes were evaluated by depositing ice in the presence of several gaseous oxyhydrocarbons and analyzing the chemical composition of the deposit. Acetone, methanol, ethanol, n-propanol, n-butanol, tert-butanol, cyclohexanol, and toluene were tested. Volume uptake appears to be the dominant process, and results are presented as temperature-dependent volume uptake coefficients. When extrapolated to 0¿C, the volume uptake coefficients are at least a factor of two smaller than predictions based on gas partitioning into liquid water. Volume uptake coefficients at -10¿C are 5--2 mol m-3 Pa-1 for the alkanols (i.e., 5 ¿ 102--2 ¿ 102 mol L-1 atm-1), 0.8 mol m-3 Pa-1 for acetone, and 0.01 mol m-3 Pa-1 for toluene. Further, our analysis indicates that the alkanols weaken water-water bonding when incorporated into ice. This assertion is based on the positive temperature dependence of the alkanol volume uptake coefficients and is corroborated by indirect estimates of the effect of the alkanols on ice saturation vapor pressure. Since the observed volume uptake coefficients do not exceed the 10 mol m-3 Pa-1 threshold proposed by Crutzen and Lawrence <2000>, our results indicate that the incorporation of the studied compounds into vapor-deposited ice is not a substantial atmospheric removal process. |
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Abstract |
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Keywords
Atmospheric Composition and Structure, Biosphere/atmosphere interactions, Atmospheric Composition and Structure, Cloud physics and chemistry, Global Change, Instruments and techniques, snow, oxygenated hydrocarbons, incorporation processes, cloud scavenging |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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