Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 16 2008 10.5194/acp-8-4855-2008 http://www.atmos-chem-phys.net/8/4855/2008/ http://www.atmos-chem-phys.net/8/4855/2008/acp-8-4855-2008.html http://www.atmos-chem-phys.net/8/4855/2008/acp-8-4855-2008.pdf 4855 4864 2008-08-21 Multiphase modeling of nitrate photochemistry in the quasi-liquid layer (QLL): implications for NO_x release from the Arctic and coastal Antarctic snowpack C. S. Boxe christopher.boxe@jpl.nasa.gov A. Saiz-Lopez Earth and Space Science Div., NASA Jet Propulsion Laboratory, California Inst. of Technology, Pasadena, CA 91109, USA We utilize a multiphase model, CON-AIR (<B>Con</B>densed Phase to <B>Air</B> Transfer Model), to show that the photochemistry of nitrate (NO₃^&minus;) in and on ice and snow surfaces, specifically the quasi-liquid layer (QLL), can account for NO_x volume fluxes, concentrations, and [NO]/[NO₂] (γ=[NO]/[NO₂]) measured just above the Arctic and coastal Antarctic snowpack. Maximum gas phase NO_x volume fluxes, concentrations and γ simulated for spring and summer range from 5.0&times;10⁴ to 6.4&times;10⁵ molecules cm^&minus;3 s^&minus;1, 5.7&times;10⁸ to 4.8&times;10⁹ molecules cm^&minus;3, and ~0.8 to 2.2, respectively, which are comparable to gas phase NO_x volume fluxes, concentrations and γ measured in the field. 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