Ground‐based stratospheric NO 2 monitoring at Keflavik (Iceland) during EASOE
1994; American Geophysical Union; Volume: 21; Issue: 13 Linguagem: Inglês
10.1029/93gl02433
ISSN1944-8007
AutoresMichel Van Roozendaël, Caroline Fayt, David Bolsée, Paul Simon, M. Gil, Margarita Yela, J. Cacho,
Tópico(s)Atmospheric and Environmental Gas Dynamics
ResumoMeasurements of nitrogen dioxide total amounts have been performed by ground‐based visible spectrometry at Keflavik, Iceland (64.0°N, 22.6°W) during EASOE. NO 2 column amounts below 1×10 15 molec/cm² are measured between December 1991 and mid‐February 1992, the lowest values being reached inside the polar vortex during the coldest period of the campaign. The usual correlation between sunset NO 2 total columns and 20 hPa temperatures was not observed during the warming of the stratosphere in February. This indicates low N 2 O 5 amounts outside the vortex, possibly related to heterogeneous reactions on Pinatubo aerosol particles. However the low NO 2 contents observed could be attributed partly to the advection of air masses from the polar night region.
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