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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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:

Authors	Institution or Email of Authors	Author's ORCID iD	ORCID Put Code
Popp, P. J.	Univ. of Colorado, Boulder, CO, USA	UNSPECIFIED	UNSPECIFIED
Marcy, T. P.	Univ. of Colorado, Boulder, CO, USA	UNSPECIFIED	UNSPECIFIED
Watts, L. A.	Univ. of Colorado, Boulder, CO, USA	UNSPECIFIED	UNSPECIFIED
Gao, R. S.	NOAA, Boulder, CO, USA	UNSPECIFIED	UNSPECIFIED
Fahey, D. W.	NOAA, Boulder, CO, USA	UNSPECIFIED	UNSPECIFIED
Weinstock, E. M.	Harvard Univ., Cambridge, Massachusetts, USA	UNSPECIFIED	UNSPECIFIED
Smith, J. B.	Harvard Univ., Cambridge, Massachusetts, USA	UNSPECIFIED	UNSPECIFIED
Herman, R. L.	California Inst. of Technology, Pasadena, CA, USA	UNSPECIFIED	UNSPECIFIED
Troy, R. F.	California Inst. of Technology, Pasadena, CA, USA	UNSPECIFIED	UNSPECIFIED
Webster, C. R.	California Inst. of Technology, Pasadena, CA, USA	UNSPECIFIED	UNSPECIFIED
Christensen, L. E.	California Inst. of Technology, Pasadena, CA, USA	UNSPECIFIED	UNSPECIFIED
Baumgardner, D. G.	Univ. Nacional Autónoma de México, Mexico City, MEX	UNSPECIFIED	UNSPECIFIED
Voigt, C.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Kärcher, B.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Wilson, J. C.	Univ. of Denver, Denver, CO, USA	UNSPECIFIED	UNSPECIFIED
Mahoney, M. J.	California Inst. of Technology, Pasadena, CA, USA	UNSPECIFIED	UNSPECIFIED
Jensen, E. J.	NASA, Moffett Field, CA, USA	UNSPECIFIED	UNSPECIFIED
Bui, T. P.	NASA, Moffett Field, CA, USA	UNSPECIFIED	UNSPECIFIED

Date:

2007

Journal or Publication Title:

Geophysical Research Letters

Refereed publication:

Yes

Open Access:

Yes

Gold Open Access:

In SCOPUS:

Yes

In ISI Web of Science:

Yes

Volume:

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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