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The observation of nitric acid-containing particles in the tropical lower stratosphere

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Author(s): P. J. Popp | T. P. Marcy | E. J. Jensen | B. Kärcher | D. W. Fahey | R. S. Gao | T. L. Thompson | K. H. Rosenlof | E. C. Richard | R. L. Herman | E. M. Weinstock | J. B. Smith | R. D. May | H. Vömel | J. C. Wilson | A. J. Heymsfield | M. J. Mahoney | A. M. Thompson

Journal: Atmospheric Chemistry and Physics
ISSN 1680-7316

Volume: 6;
Issue: 3;
Start page: 601;
Date: 2006;
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ABSTRACT
Airborne in situ measurements over the eastern Pacific Ocean in January 2004 have revealed a new category of nitric acid (HNO3)-containing particles in the tropical lower stratosphere. These particles are most likely composed of nitric acid trihydrate (NAT). They were intermittently observed in a narrow layer above the tropopause (18±0.1 km) and over a broad geographic extent (>1100 km). In contrast to the background liquid sulfate aerosol, these particles are solid, much larger (1.7-4.7 µm vs. 0.1µm in diameter), and significantly less abundant (
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