Large Contribution of Coarse Mode to Aerosol Microphysical and Optical Properties: Evidence from Ground-Based Observations of a Transpacific Dust Outbreak at a High-Elevation North American Site

Kassianov, E.; Pekour, M.; Flynn, C.; Berg, L. K.; Beranek, J.; Zelenyuk, A.; Zhao, C.; Leung, L. R.; Ma, P. L.; Riihimaki, L.; Fast, J. D.; Barnard, J.; Hallar, A. G.; McCubbin, I. B.; Eloranta, E. W.; McComiskey, A.; Rasch, P. J.

doi:10.1175/jas-d-16-0256.1

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Large Contribution of Coarse Mode to Aerosol Microphysical and Optical Properties: Evidence from Ground-Based Observations of a Transpacific Dust Outbreak at a High-Elevation North American Site

2017
By Kassianov, E. ; Pekour, M. ; Flynn, C. ; ...
Source: Journal of the Atmospheric Sciences, 74(5), 1431-1443.

[PDF-2.50 MB]

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Journal Title:

Journal of the Atmospheric Sciences
Personal Author:

Kassianov, E. ; Pekour, M. ; Flynn, C. ; Berg, L. K. ; Beranek, J. ; ... More +

Kassianov, E. ; Pekour, M. ; Flynn, C. ; Berg, L. K. ; Beranek, J. ; Zelenyuk, A. ; Zhao, C. ; Leung, L. R. ; Ma, P. L. ; Riihimaki, L. ; Fast, J. D. ; Barnard, J. ; Hallar, A. G. ; McCubbin, I. B. ; Eloranta, E. W. ; McComiskey, A. ; Rasch, P. J. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory)

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) Less -
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This work is motivated by previous studies of transatlantic transport of Saharan dust and the observed quasi-static nature of coarse mode aerosol with a volume median diameter (VMD) of approximately 3.5 mm. The authors examine coarse mode contributions from transpacific transport of dust to North American aerosol properties using a dataset collected at the high-elevation Storm Peak Laboratory (SPL) and the nearby Atmospheric Radiation Measurement (ARM) Mobile Facility. Collected ground-based data are complemented by quasi-global model simulations and satellite and ground-based observations. The authors identify a major dust event associated mostly with a transpacific plume (about 65% of near-surface aerosol mass) in which the coarse mode with moderate (similar to 3 mu m) VMDis distinct and contributes substantially to total aerosol volume (up to 70%) and scattering (up to 40%). The results demonstrate that the identified plume at the SPL site has a considerable fraction of supermicron particles (VMD similar to 3 mu m) and, thus, suggest that these particles have a fairly invariant behavior despite transpacific transport. If confirmed in additional studies, this invariant behavior may simplify considerably parameterizations for size-dependent processes associated with dust transport and removal.
Source:

Journal of the Atmospheric Sciences, 74(5), 1431-1443.
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http://dx.doi.org/10.1175/jas-d-16-0256.1
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Journal Article
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urn:sha256:0301011580b753d5d08786e1d567e66194ff9c2eeee08742f4b02dd0c825f035
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Large Contribution of Coarse Mode to Aerosol Microphysical and Optical Properties: Evidence from Ground-Based Observations of a Transpacific Dust Outbreak at a High-Elevation North American Site

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