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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. Wiley. DOI: 10.1029/2007GL031832

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

Abstract

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

Item URL in elib:https://elib.dlr.de/52530/
Document Type:Article
Title:Condensed-phase nitric acid in a tropical subvisible cirrus cloud
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Popp, P. J.Univ. of Colorado, Boulder, CO, USAUNSPECIFIED
Marcy, T. P.Univ. of Colorado, Boulder, CO, USAUNSPECIFIED
Watts, L. A.Univ. of Colorado, Boulder, CO, USAUNSPECIFIED
Gao, R. S.NOAA, Boulder, CO, USAUNSPECIFIED
Fahey, D. W.NOAA, Boulder, CO, USAUNSPECIFIED
Weinstock, E. M.Harvard Univ., Cambridge, Massachusetts, USAUNSPECIFIED
Smith, J. B.Harvard Univ., Cambridge, Massachusetts, USAUNSPECIFIED
Herman, R. L.California Inst. of Technology, Pasadena, CA, USAUNSPECIFIED
Troy, R. F.California Inst. of Technology, Pasadena, CA, USAUNSPECIFIED
Webster, C. R.California Inst. of Technology, Pasadena, CA, USAUNSPECIFIED
Christensen, L. E.California Inst. of Technology, Pasadena, CA, USAUNSPECIFIED
Baumgardner, D. G.Univ. Nacional Autónoma de México, Mexico City, MEXUNSPECIFIED
Voigt, C.UNSPECIFIEDUNSPECIFIED
Kärcher, B.UNSPECIFIEDUNSPECIFIED
Wilson, J. C.Univ. of Denver, Denver, CO, USAUNSPECIFIED
Mahoney, M. J.California Inst. of Technology, Pasadena, CA, USAUNSPECIFIED
Jensen, E. J.NASA, Moffett Field, CA, USAUNSPECIFIED
Bui, T. P.NASA, Moffett Field, CA, USAUNSPECIFIED
Date:2007
Journal or Publication Title:Geophysical Research Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:34
DOI :10.1029/2007GL031832
Page Range:pp. 1-5
Publisher:Wiley
Status:Published
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: Freund, Jana
Deposited On:04 Jan 2008
Last Modified:31 Jul 2019 19:21

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