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Observations of continental biogenic impacts on marine aerosol and clouds off the coast of California

Coggon, M. M. and Sorooshian, A. and Wang, Z. and Craven, J. S. and Metcalf, A. R. and Lin, J. J. and Nenes, A. and Jonsson, H. H. and Flagan, R. C. and Seinfeld, J. H. (2014) Observations of continental biogenic impacts on marine aerosol and clouds off the coast of California. Journal of Geophysical Research. Atmospheres, 119 (11). pp. 6724-6748. ISSN 2169-897X. https://resolver.caltech.edu/CaltechAUTHORS:20140729-082417829

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Abstract

During the 2011 Eastern Pacific Emitted Aerosol Cloud Experiment (E-PEACE) and 2013 Nucleation in California Experiment (NiCE) field campaigns, a predominantly organic aerosol (> 85% by mass) was observed in the free troposphere over marine stratocumulus off the coast of California. These particles originated from a densely forested region in the Northwestern United States. The organic mass spectrum resolved by positive matrix factorization is consistent with the mass spectra of previously measured biogenic organic aerosol. Particulate organic mass exhibits a latitudinal gradient that corresponds to the geographical distribution of vegetation density and composition, with the highest concentration over regions impacted by densely populated monoterpene sources. Due to meteorological conditions during summer months, cloud-clearing events transport aerosol from the Northwestern United States into the free troposphere above marine stratocumulus. Based on the variation of meteorological variables with altitude, dry air containing enhanced biogenic organic aerosol is shown to entrain into the marine boundary layer. Fresh impacts on cloud water composition are observed north of San Francisco, CA which is consistent with fresh continental impacts on the marine atmosphere at higher latitudes. Continental aerosol size distributions are bimodal. Particles in the 100 nm mode are impacted by biogenic sources, while particles in the ∼ 30 nm mode may originate from fresh biogenic emissions. Continental aerosol in the 100 nm mode is cloud condensation nuclei active and may play a role in modulating marine stratocumulus microphysics.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/2013JD021228DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2013JD021228/abstractPublisherArticle
http://onlinelibrary.wiley.com/doi/10.1002/2013JD021228/suppinfoPublisherSupporting Information
ORCID:
AuthorORCID
Coggon, M. M.0000-0002-5763-1925
Sorooshian, A.0000-0002-2243-2264
Metcalf, A. R.0000-0003-0385-1356
Nenes, A.0000-0003-3873-9970
Jonsson, H. H.0000-0003-3043-1074
Flagan, R. C.0000-0001-5690-770X
Seinfeld, J. H.0000-0003-1344-4068
Additional Information:© 2014 American Geophysical Union. Received 21 November 2013; Accepted 16 May 2014; Accepted article online 21 May 2014; Published online 11 June 2014. This work was funded by ONR grants N00014-11-1-0783, N00014-14-1-0097, and N00014-10-1-0811, and NSF grants AGS-1008848 and AGS-1013381. A.N. acknowledges support from an NSF CAREER award. J.J.L. acknowledges support from a Georgia Tech President’s fellowship and a NASA Graduate Student Researchers Program Fellowship. Conclusions drawn here reflect those of the authors and do not necessarily reflect the opinions of the Office of Naval Research or the National Science Foundation. We acknowledge Dean Hegg for providing the cloud water collector and Joseph Ensberg for helpful discussion. Please contact corresponding author for data requests. AMS mass spectra will be uploaded to the spectral database (http://cires.colorado.edu/jimenez-group/AMSsd/).
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-11-1-0783
Office of Naval Research (ONR)N00014-14-1-0097
Office of Naval Research (ONR)N00014-10-1-0811
NSFAGS-1008848
Subject Keywords:biogenic aerosol; marine stratocumulus; cloud condensation nuclei
Issue or Number:11
Record Number:CaltechAUTHORS:20140729-082417829
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140729-082417829
Official Citation:Coggon, M. M., A. Sorooshian, Z. Wang, J. S. Craven, A. R. Metcalf, J. J. Lin, A. Nenes, H. H. Jonsson, R. C. Flagan, and J. H. Seinfeld (2014), Observations of continental biogenic impacts on marine aerosol and clouds off the coast of California, J. Geophys. Res. Atmos., 119, 6724–6748, doi:10.1002/2013JD021228.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47547
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:30 Jul 2014 17:48
Last Modified:03 Oct 2019 06:54

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