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Title:Morphology and mixing state of aged soot particles at a remote marine free troposphere site : implications for optical properties
Authors:China, Swarup (Author)
Scarnato, Barbara (Author)
Owen, Robert C. (Author)
Zhang, Bo (Author)
Ampadu, MarianT. (Author)
Kumar, Sumit (Author)
Džepina, Katja (Author)
Dziobak, Michael P. (Author)
Fialho, Paulo (Author)
Perlinger, Judith A. (Author)
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Unknown ()
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:The radiative properties of soot particles depend on their morphology and mixing state, but their evolution during transport is still elusive. Here we report observations from an electron microscopy analysis of individual particles transported in the free troposphere over long distances to the remote Pico Mountain Observatory in the Azores in the North Atlantic. Approximately 70% of the soot particles were highly compact and of those 26% were thinly coated. Discrete dipole approximation simulations indicate that this compaction results in an increase in soot single scattering albedo by a factor of <= 2.17. The top of the atmosphere direct radiative forcing is typically smaller for highly compact than mass-equivalent lacy soot. The forcing estimated using Mie theory is within 12% of the forcing estimated using the discrete dipole approximation for a high surface albedo, implying that Mie calculations may provide a reasonable approximation for compact soot above remote marine clouds.
Keywords:atmospheric aerosol, soot, long-range transport, free troposphere, single scattering albedo
Year of publishing:2015
Number of pages:str. 1243-1250
Numbering:iss. 4, Vol. 42
COBISS_ID:59042307 Link is opened in a new window
UDC:54
ISSN on article:0094-8276
URN:URN:SI:UNG:REP:OASIHOMS
DOI:10.1002/2014GL062404 Link is opened in a new window
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Title:Geophysical research letters
Shortened title:Geophys. res. lett.
Publisher:American Geophysical Union.
ISSN:0094-8276
COBISS.SI-ID:16168965 New window

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