Denitrification in the Arctic mid-winter 2004/2005 observed by airborne submillimeter radiometry

Details Denitrification in the Arctic mid-winter 2004/2005 observed by airborne submillimeter radiometry Denitrification in the Arctic mid-winter 2004/2005 observed by airborne submillimeter radiometry

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3219811k&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 19, CiteID L19811

Physics

18

Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Atmospheric Composition And Structure: Middle Atmosphere: Constituent Transport And Chemistry (3334), Atmospheric Processes: Remote Sensing

Scientific paper

We present measurements of unusually low mixing ratios of HNO3 in the exceptionally cold Arctic vortex of late-January and early-February 2005. The measurements were obtained by the airborne submillimeter radiometer ASUR during the polar aura validation experiment (PAVE). The distribution of HNO3 inside the vortex reaches minima below 4 ppbv around 22 km altitude and maxima above 13 ppbv around 16 km altitude, with a considerable spatial variability. We estimate a vortex averaged denitrification of 3.1 +/- 0.8 ppbv around 20 km altitude, and slight renitrification below ~15.5 km altitude. The observed HNO3 deficit is largest (~6 ppbv) near the center of the vortex, where the air masses had experienced temperatures below the NAT formation threshold for 80-100% of the previous 20 days according to back trajectories. This suggests that the main denitrification mechanism is based on sedimenting nitric acid trihydrate particles.

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