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Condensed-phase nitric acid in a tropical subvisible cirrus cloud

Popp, P. J. and Marcy, T. P. and Watts, L. A. and Gao, R. S. and Fahey, D. W. and Weinstock, E. M. and Smith, J. B. and Herman, R. L. and Troy, R. F. and Webster, C. R. and Christensen, L. E. and Baumgardner, D. G. and Voigt, C. and Kärcher, B. and Wilson, J. C. and Mahoney, M. J. and Jensen, E. J. and Bui, T. P. (2007) Condensed-phase nitric acid in a tropical subvisible cirrus cloud. Geophysical Research Letters, 34 (L24812), pp. 1-5. DOI: 10.1029/2007GL031832.

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Official URL: http://www.agu.org/pubs/crossref/2007/2007GL031832.shtml


In situ observations in a tropical subvisible cirrus cloud during the Costa Rica Aura Validation Experiment on 2 February 2006 show the presence of condensed-phase nitric acid. The cloud was observed near the tropopause at altitudes of 16.3–17.7 km in an extremely cold (183–191 K) and dry (.lt. 5 ppm H2O) air mass. Relative humidities with respect to ice ranged from 150–250% throughout most of the cloud. Optical particle measurements indicate the presence of ice crystals as large as 90 μm in diameter. Condensed HNO3/H2O molar ratios observed in the cloud particles were 1–2 orders of magnitude greater than ratios observed previously in cirrus clouds at similar HNO3 partial pressures. Nitric acid trihydrate saturation ratios were 10 or greater during much of the cloud encounter, indicating that HNO3 may be present in the cloud particles as a stable condensate and not simply physically adsorbed on or trapped in the particles

Document Type:Article
Title:Condensed-phase nitric acid in a tropical subvisible cirrus cloud
AuthorsInstitution or Email of Authors
Popp, P. J.Univ. of Colorado, Boulder, CO, USA
Marcy, T. P.Univ. of Colorado, Boulder, CO, USA
Watts, L. A.Univ. of Colorado, Boulder, CO, USA
Gao, R. S.NOAA, Boulder, CO, USA
Fahey, D. W.NOAA, Boulder, CO, USA
Weinstock, E. M.Harvard Univ., Cambridge, Massachusetts, USA
Smith, J. B.Harvard Univ., Cambridge, Massachusetts, USA
Herman, R. L.California Inst. of Technology, Pasadena, CA, USA
Troy, R. F.California Inst. of Technology, Pasadena, CA, USA
Webster, C. R.California Inst. of Technology, Pasadena, CA, USA
Christensen, L. E.California Inst. of Technology, Pasadena, CA, USA
Baumgardner, D. G.Univ. Nacional Autónoma de México, Mexico City, MEX
Wilson, J. C.Univ. of Denver, Denver, CO, USA
Mahoney, M. J.California Inst. of Technology, Pasadena, CA, USA
Jensen, E. J.NASA, Moffett Field, CA, USA
Bui, T. P.NASA, Moffett Field, CA, USA
Journal or Publication Title:Geophysical Research Letters
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-5
Keywords:nitric acid; subvisible cirrus; tropical tropopause
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:04 Jan 2008
Last Modified:20 Oct 2014 14:32

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