Deposition of dinitrogen pentoxide, N2O5, to the snowpack at high latitudes

• Published in: Atmospheric chemistry and physics 2011-01, Vol.11 (10), p.4929-4938
• Main Authors: Huff, D M, Joyce, P L, Fochesatto, G J, Simpson, W R
• Format: Article
• Language: English
• ISSN: 1680-7316; 1680-7324
• DOI: 10.5194/acp-11-4929-2011

Dinitrogen pentoxide, N2 O5 , 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 N2 O5 depositing to snowpack using the aerodynamic gradient method. The deposition velocity of N2 O5 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 N2 O5 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 N2 O5 that is located within the first few meters above the ground surface.