Impact of emissions from shipping, land, and the ocean on stratocumulus cloud water elemental composition during the 2011 E-PEACE field campaign

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Authors
Wang, Z.
Sorooshian, A.
Prabhakar, G.
Coggon, M.M.
Jonsson, H.H.
Subjects
cloud water
shipping
marine
metals
iron
ocean
cloud processing
nutrients
coastal region
Advisors
Date of Issue
2014
Date
2014
Publisher
Elsevier Ltd.
Language
Abstract
This study reports on cloud water chemical and pH measurements off the California coast during the July-August 2011 Eastern Pacific Emitted Aerosol Cloud Experiment (E-PEACE). Eighty two cloud water samples were collected by a slotted-rod cloud water collector protruding above the Center for Interdisciplinary Remotely-Piloted Aircraft Studies (CIRPAS) Twin Otter in boundary layer stratocumulus clouds impacted to varying degrees by ocean-derived emissions, ship exhaust, and land emissions. Cloud water pH ranged between 2.92 and 7.58, with an average of 4.46. Peak pH values were observed north of San Francisco, simultaneous with the highest concentrations of Si, B, and Cs, and air masses originating over land. The lowest pH values were observed south of San Francisco due to ship emissions resulting in the highest concentrations of sulfate, nitrate, V, Fe, Al, P, Cd, Ti, Sb, P, and Mn. Many of these species act as important agents in aqueous-phase reactions in cloud drops and are critical ocean micronutrients after subsequent wet deposition in an ocean system that can be nutrient-limited. E-PEACE measurements suggest that conditions in the California coastal zone region can promote the conversion of micronutrients to more soluble forms, if they are not already, due to acidic cloud water conditions, the ubiquity of important organic agents such as oxalic acid, and the persistence of stratocumulus clouds to allow for continuous cloud processing.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1016/j.atmosenv.2014.01.020
includes supplementary material
Series/Report No
Department
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
NOAA Air Resources Laboratory (ARL)
Funder
ONR grants N00014-11-1-0783, N00014-10-1-0200, and N00014-10-1-0811
NSF grant AGS-1008848
Format
11 p.
Citation
Wang, Z., et al. "Impact of emissions from shipping, land, and the ocean on stratocumulus cloud water elemental composition during the 2011 E-PEACE field campaign." Atmospheric Environment 89 (2014): 570-580.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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