Kärcher, Bernd and Voigt, Christiane (2006) Formation of nitric acid/water ice particles in cirrus clouds. Geophysical Research Letters, 33, L08806. DOI: 10.1029/2006GL025927.
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Nitric acid (HNO<sub>3</sub>) in cirrus ice crystals has been measured in the last decade during airborne field campaigns at latitudes 53°S–68°N. The HNO<sub>3</sub>content in ice crystals, expressed in terms of HNO<sub>3</sub>/H<sub>2</sub>O molar ratio, and the fraction of HNO3 in ice derived from those measurements exhibit a clear upward trend with decreasing temperature. The observations are explained by a novel model describing dissolution of HNO<sub>3</sub> in liquid aerosol particles serving as freezing nuclei and subsequent trapping of HNO<sub>3</sub> during ice crystal growth. The efficiency of trapping increases with decreasing temperature. Efficient trapping occurs via diffusional burial of the ambient HNO<sub>3</sub> below about 203 K, because of long residence times of HNO<sub>3</sub> molecules at the ice surface. This opens the possibility for HNO<sub>3</sub>-induced modifications of processes affecting ice crystal growth. At warmer temperatures, molecular processes in the ice surface layer cause an increasingly rapid escape of adsorbed HNO<sub>3</sub> into the gas phase and render trapping less efficient despite faster ice growth rates.
|Title:||Formation of nitric acid/water ice particles in cirrus clouds|
|Journal or Publication Title:||Geophysical Research Letters|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Keywords:||nitric acid, ice crystals, HNO3|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Space (old)|
|HGF - Program Themes:||W EO - Erdbeobachtung|
|DLR - Research area:||Space|
|DLR - Program:||W EO - Erdbeobachtung|
|DLR - Research theme (Project):||W - Vorhaben Atmosphären- und Klimaforschung (old)|
|Institutes and Institutions:||Institute of Atmospheric Physics > Atmospheric Trace Species|
|Deposited By:||Jana Freund|
|Deposited On:||20 Jun 2006|
|Last Modified:||11 Nov 2014 21:56|
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