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Nitric acid in cirrus clouds
Voigt, C. and Schlager, H. and Ziereis, H. and Kärcher, B. and Luo, B.P. and Schiller, C. and Krämer, M. and Popp, P.J. and Irie, H. and Kondo, Y. (2006) Nitric acid in cirrus clouds. Geophysical Research Letters, 33, . DOI: 10.1029/2005GL025159.
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Abstract
Uptake of nitric acid (HNO<sub>3</sub>) in Arctic cirrus ice crystals was observed on 11 February 2003 by in-situ instruments onboard the M55 Geophysica aircraft. The cirrus cloud with a mean ice water content of 5.4 mg m<sup>-3</sup> covered northern Scandinavia for several hours and extended up to the thermal tropopause at 12.3 km. Within the cirrus region, on average 9% of the total HNO<sub>3</sub> measured as reactive nitrogen (NOy) is present in ice particles, increasing to 19% at temperatures below 205 K. In contrast to previous studies, we discuss the HNO<sub>3</sub> uptake in ice in terms of HNO<sub>3</sub>/H<sub>2</sub>O molar ratios in ice crystals. The HNO<sub>3</sub>content of the ice increases with increasing gas phase HNO<sub>3</sub> concentrations and decreasing temperatures. Enhanced uptake of HNO<sub>3</sub> in ice and heterogeneous chemistry on cold cirrus clouds may disturb the upper tropospheric ozone budget.
| Document Type: | Article | ||||||||||||||||||||||
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| Title: | Nitric acid in cirrus clouds | ||||||||||||||||||||||
| Authors: |
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| Date: | 2006 | ||||||||||||||||||||||
| Journal or Publication Title: | Geophysical Research Letters | ||||||||||||||||||||||
| Refereed publication: | Yes | ||||||||||||||||||||||
| In ISI Web of Science: | Yes | ||||||||||||||||||||||
| Volume: | 33 | ||||||||||||||||||||||
| DOI: | 10.1029/2005GL025159 | ||||||||||||||||||||||
| Page Range: | |||||||||||||||||||||||
| Status: | Published | ||||||||||||||||||||||
| Keywords: | cirrus clouds, trace gas uptake, ice formation | ||||||||||||||||||||||
| HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||||||||||||
| HGF - Program: | Space | ||||||||||||||||||||||
| 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: | 09 Mar 2007 | ||||||||||||||||||||||
| Last Modified: | 27 Apr 2009 05:02 |
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