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On the presence of giant particles downwind of ships in the marine boundary layer

Sorooshian, Armin and Prabhakar, Gouri and Jonsson, Haflidi and Woods, Roy K. and Flagan, Richard C. and Seinfeld, John H. (2015) On the presence of giant particles downwind of ships in the marine boundary layer. Geophysical Research Letters, 42 (6). pp. 2024-2030. ISSN 0094-8276. doi:10.1002/2015GL063179. https://resolver.caltech.edu/CaltechAUTHORS:20150515-110243412

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Abstract

This study examines large oceangoing ships as a source of giant cloud condensation nuclei (D_p > 2 µm) due to wake and stack emissions off the California coast. Observed particle number concentrations behind 10 ships exceeded those in “control” areas, exhibiting number concentration enhancement ratios (ERs) for minimum threshold diameters of ~2, ~10, and ~20 µm as high as 2.7, 5.5, and 7.5, respectively. ER decreases with increasing downwind distance and altitude. ER becomes better correlated with ship size variables (gross tonnage, length, and beam) as the minimum size threshold increases from 2 to 20 µm, whereas ship speed has a less distinct relationship with ER. One case study of a container ship shows that there are higher concentrations of sea-salt tracer species behind it relative to adjacent control areas. These results have implications for cloud properties and precipitation in marine boundary layers exposed to ship traffic.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/2015GL063179 DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2015GL063179/abstractPublisherArticle
http://api.onlinelibrary.wiley.com/asset/v1/doi/10.1002%2F2015GL063179/asset/supinfo%2Fgrl52711-sup-0001-Supplementary.pdfPublisherSupporting Information
ORCID:
AuthorORCID
Sorooshian, Armin0000-0002-2243-2264
Jonsson, Haflidi0000-0003-3043-1074
Woods, Roy K.0000-0002-3632-6374
Flagan, Richard C.0000-0001-5690-770X
Seinfeld, John H.0000-0003-1344-4068
Additional Information:© 2015 American Geophysical Union. Received 19 JAN 2015; Accepted 1 MAR 2015; Accepted article online 4 MAR 2015; Published online 24 MAR 2015. All data used can be obtained from the corresponding author. This work was funded by ONR grants N00014-11-1-0783, N00014-10-1-0200, N00014-04-1-0118, and N00014-10-1-0811 and NSF grant AGS-1008848. Zhen Wang is acknowledged for her assistance with ship and satellite data. The Editor thanks Robert Wood and Darrel Gibson Baumgardner for their assistance in evaluating this paper.
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-11-1-0783
Office of Naval Research (ONR)N00014-10-1-0200
Office of Naval Research (ONR)N00014-04-1-0118
Office of Naval Research (ONR)N00014-10-1-0811
NSFAGS-1008848
Subject Keywords:giant CCN; shipping; marine boundary layer; stratocumulus; sea salt; aerosol
Issue or Number:6
DOI:10.1002/2015GL063179
Record Number:CaltechAUTHORS:20150515-110243412
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150515-110243412
Official Citation:Sorooshian, A., G. Prabhakar, H. Jonsson, R. K. Woods, R. C. Flagan, and J. H. Seinfeld (2015), On the presence of giant particles downwind of ships in the marine boundary layer. Geophys. Res. Lett., 42, 2024–2030. doi: 10.1002/2015GL063179.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57566
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 May 2015 18:21
Last Modified:10 Nov 2021 21:51

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