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Measurements of total reactive nitrogen (NOy) concentrations in the gas and aerosol phases were made on board the NASA DC‐8 aircraft within 1 km above the Arctic tropopause in February 2000. As temperatures decreased, NOy was taken up into the background sulfate aerosols. The observed temperature‐dependent NOy uptake agrees well with that calculated from a model of nitric acid (HNO3) uptake to form liquid HNO3/H2O/H2SO4 ternary droplets. The observations reported here provide the first direct evidence for the formation of ternary droplets in the Arctic tropopause region.
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Irie et al. (2004) studied this question.
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