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Formation of nitric acid/water ice particles in cirrus clouds

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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Abstract

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.

Document Type:Article
Title:Formation of nitric acid/water ice particles in cirrus clouds
Authors:
AuthorsInstitution or Email of Authors
Kärcher, BerndUNSPECIFIED
Voigt, ChristianeUNSPECIFIED
Date:2006
Journal or Publication Title:Geophysical Research Letters
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:33
DOI:10.1029/2006GL025927
Page Range:L08806
Status:Published
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)
Location: Oberpfaffenhofen
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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