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Measurements of nitrogen oxides from Hudson Bay: Implications for NOx release from snow and ice covered surfaces

Moller, S.J.; Lee, J.D.; Commane, R.; Edwards, P.; Heard, D.E.; Hopkins, J.; Ingham, T.; Mahajan, A.S.; Oetjen, H.; Plane, J.; Roscoe, Howard; Lewis, A.C.; Carpenter, L.J.. 2010 Measurements of nitrogen oxides from Hudson Bay: Implications for NOx release from snow and ice covered surfaces. Atmospheric Environment, 44 (25). 2971-2979. 10.1016/j.atmosenv.2010.05.015

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Abstract/Summary

Measurements of NO and NO2 were made at a surface site (55.28 degrees N, 77.77 degrees W) near Kuujjuarapik, Canada during February and March 2008. NOx mixing ratios ranged from near zero to 350 pptv with emission from snow believed to be the dominant source. The amount of NOx was observed to be dependent on the terrain over which the airmass has passed before reaching the measurement site. The 24 h average NOx emission rates necessary to reproduce observations were calculated using a zero-dimensional box model giving rates ranging from 6.9 x 10(8) molecule cm(-2) s(-1) to 1.2 x 10(9) molecule cm(-2) s(-1) for trajectories over land and from 3.8 x 10(8) molecule cm(-2) s(-1) to 6.6 x 10(8) molecule cm(-2) s(-1) for trajectories over sea ice. These emissions are higher than those suggested by previous studies and indicate the importance of lower latitude snowpack emissions. The difference in emission rate for the two types of snow cover shows the importance of snow depth and underlying surface type for the emission potential of snow-covered areas. (C) 2010 Elsevier Ltd. All rights reserved.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.atmosenv.2010.05.015
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Chemistry and Past Climate
ISSN: 1352-2310
NORA Subject Terms: Meteorology and Climatology
Glaciology
Chemistry
Atmospheric Sciences
Date made live: 06 Oct 2010 13:02
URI: http://nora.nerc.ac.uk/id/eprint/10850

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