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This study uses airborne cloud water composition measurements to characterize the vertical structure of air‐equivalent mass concentrations of water‐soluble species in marine stratocumulus clouds off the California coast. A total of 385 cloud water samples were collected in the months of July and August between 2011 and 2016 and analyzed for water‐soluble ionic and elemental composition. Three characteristic profiles emerge: (i) a reduction of concentration with in‐cloud altitude for particulate species directly emitted from sources below cloud without in‐cloud sources (e.g., Cl^− and Na^+), (ii) an increase of concentration with in‐cloud altitude (e.g., NO_2− and formate), and (iii) species exhibiting a peak in concentration in the middle of cloud (e.g., non–sea‐salt SO_4^2−, NO_3−, and organic acids). Vertical profiles of rainout parameters such as loss frequency, lifetime, and change in concentration with respect to time show that the scavenging efficiency throughout the cloud depth depends strongly on the thickness of the cloud. Thin clouds exhibit a greater scavenging loss frequency at cloud top, while thick clouds have a greater scavenging loss frequency at cloud base. The implications of these results for treatment of wet scavenging in models are discussed.

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Caltech Authors  


MacDonald, Alexander B. -  Dadashazar, Hossein -  Chuang, Patrick Y. -  Crosbie, Ewan -  Wang, Hailong -  Wang, Zhen -  Jonsson, Haflidi H. -  Flagan, Richard C. -  Seinfeld, John H. -  Sorooshian, Armin - 

Id.: 71322039

Versión: 1.0

Estado: Final

Tipo:  application/msword - 

Tipo de recurso: Article  -  PeerReviewed  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

Formatos:  application/msword - 

Requerimientos técnicos:  Browser: Any - 

Relación: [References] http://resolver.caltech.edu/CaltechAUTHORS:20180516-141614487
[References] https://authors.library.caltech.edu/86426/

Fecha de contribución: 19-may-2018


* MacDonald, Alexander B. and Dadashazar, Hossein and Chuang, Patrick Y. and Crosbie, Ewan and Wang, Hailong and Wang, Zhen and Jonsson, Haflidi H. and Flagan, Richard C. and Seinfeld, John H. and Sorooshian, Armin (2018) Characteristic Vertical Profiles of Cloud Water Composition in Marine Stratocumulus Clouds and Relationships With Precipitation. Journal of Geophysical Research. Atmospheres, 123 (7). pp. 3704-3723. ISSN 2169-897X. http://resolver.caltech.edu/CaltechAUTHORS:20180516-141614487

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