Deposition of dinitrogen pentoxide, N2O5, to the snowpack at high latitudes D. M. Huff1,2, P. L. Joyce1,2, G. J. Fochesatto2,3, and W. R. Simpson1,2 1Department of Chemistry and Biochemistry, University of Alaska, Fairbanks, AK, USA 2Geophysical Institute, University of Alaska, Fairbanks, AK, USA 3Department of Atmospheric Science, University of Alaska, Fairbanks, AK, USA
Abstract. Dinitrogen pentoxide, N2O5, is an important nighttime intermediate
in the oxidation of NOx that is hydrolysed on surfaces. We conducted a
field campaign in Fairbanks, Alaska during November 2009 to measure the
gradient and derive a flux (and deposition velocity) of N2O5
depositing to snowpack using the aerodynamic gradient method. The deposition
velocity of N2O5 under Arctic winter conditions was found to be
0.59 ± 0.47 cm s−1, which is the first measurement of this parameter to our
knowledge. Based on the measured deposition velocity, we compared the
chemical loss rate of N2O5 via snowpack deposition to the total
steady state loss rate and found that deposition to snowpack is at least
1/8th of the total chemical removal of N2O5 that is located
within the first few meters above the ground surface.
Citation: Huff, D. M., Joyce, P. L., Fochesatto, G. J., and Simpson, W. R.: Deposition of dinitrogen pentoxide, N2O5, to the snowpack at high latitudes, Atmos. Chem. Phys., 11, 4929-4938, doi:10.5194/acp-11-4929-2011, 2011.