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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, L05803. DOI: 10.1029/2005GL025159.

Full text not available from this repository.

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
Title:Nitric acid in cirrus clouds
Authors:
AuthorsInstitution or Email of Authors
Voigt, C.UNSPECIFIED
Schlager, H.UNSPECIFIED
Ziereis, H.UNSPECIFIED
Kärcher, B.UNSPECIFIED
Luo, B.P.ETH Zürich, Zürich, CH
Schiller, C.FZ Jülich, Jülich
Krämer, M.FZ Jülich, Jülich
Popp, P.J.NOAA, Boulder, CO, USA
Irie, H.Marine-EarthJapan Agency for Science and Technology, Yokohama, J
Kondo, Y.Univ. of Tokyo, J
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:L05803
Status:Published
Keywords:cirrus clouds, trace gas uptake, ice formation
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:09 Mar 2007
Last Modified:27 Apr 2009 05:02

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