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Title: Derivation of physical and optical properties of mid-latitude cirrus ice crystals for a size-resolved cloud microphysics model

Abstract

Single-crystal images collected in mid-latitude cirrus are analyzed to provide internally consistent ice physical and optical properties for a size-resolved cloud microphysics model, including single-particle mass, projected area, fall speed, capacitance, single-scattering albedo, and asymmetry parameter. Using measurements gathered during two flights through a widespread synoptic cirrus shield, bullet rosettes are found to be the dominant identifiable habit among ice crystals with maximum dimension (Dmax) greater than 100 µm. Properties are therefore first derived for bullet rosettes based on measurements of arm lengths and widths, then for aggregates of bullet rosettes and for unclassified (irregular) crystals. Derived bullet rosette masses are substantially greater than reported in existing literature, whereas measured projected areas are similar or lesser, resulting in factors of 1.5–2 greater fall speeds, and, in the limit of large Dmax, near-infrared single-scattering albedo and asymmetry parameter (g) greater by ~0.2 and 0.05, respectively. Furthermore, a model that includes commonly imaged side plane growth on bullet rosettes exhibits relatively little difference in microphysical and optical properties aside from ~0.05 increase in mid-visible g primarily attributable to plate aspect ratio. In parcel simulations, ice size distribution, and g are sensitive to assumed ice properties.

Authors:
ORCiD logo; ; ORCiD logo; ORCiD logo; ; ORCiD logo; ;
Publication Date:
Research Org.:
NASA Goddard Inst. for Space Studies (GISS), New York, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1256532
Alternate Identifier(s):
OSTI ID: 1288211
Grant/Contract Number:  
SC0006988; SC0008500; SC0014065; SC001406; AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online) Journal Volume: 16 Journal Issue: 11; Journal ID: ISSN 1680-7324
Publisher:
Copernicus Publications, EGU
Country of Publication:
Germany
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; single-scattering properties; general hydrodynamic theory; large-eddy simulations; in-situ observations; radiative properties; part i; climate models; water-content; fall speeds; terminal velocities

Citation Formats

Fridlind, Ann M., Atlas, Rachel, van Diedenhoven, Bastiaan, Um, Junshik, McFarquhar, Greg M., Ackerman, Andrew S., Moyer, Elisabeth J., and Lawson, R. Paul. Derivation of physical and optical properties of mid-latitude cirrus ice crystals for a size-resolved cloud microphysics model. Germany: N. p., 2016. Web. doi:10.5194/acp-16-7251-2016.
Fridlind, Ann M., Atlas, Rachel, van Diedenhoven, Bastiaan, Um, Junshik, McFarquhar, Greg M., Ackerman, Andrew S., Moyer, Elisabeth J., & Lawson, R. Paul. Derivation of physical and optical properties of mid-latitude cirrus ice crystals for a size-resolved cloud microphysics model. Germany. https://doi.org/10.5194/acp-16-7251-2016
Fridlind, Ann M., Atlas, Rachel, van Diedenhoven, Bastiaan, Um, Junshik, McFarquhar, Greg M., Ackerman, Andrew S., Moyer, Elisabeth J., and Lawson, R. Paul. Fri . "Derivation of physical and optical properties of mid-latitude cirrus ice crystals for a size-resolved cloud microphysics model". Germany. https://doi.org/10.5194/acp-16-7251-2016.
@article{osti_1256532,
title = {Derivation of physical and optical properties of mid-latitude cirrus ice crystals for a size-resolved cloud microphysics model},
author = {Fridlind, Ann M. and Atlas, Rachel and van Diedenhoven, Bastiaan and Um, Junshik and McFarquhar, Greg M. and Ackerman, Andrew S. and Moyer, Elisabeth J. and Lawson, R. Paul},
abstractNote = {Single-crystal images collected in mid-latitude cirrus are analyzed to provide internally consistent ice physical and optical properties for a size-resolved cloud microphysics model, including single-particle mass, projected area, fall speed, capacitance, single-scattering albedo, and asymmetry parameter. Using measurements gathered during two flights through a widespread synoptic cirrus shield, bullet rosettes are found to be the dominant identifiable habit among ice crystals with maximum dimension (Dmax) greater than 100 µm. Properties are therefore first derived for bullet rosettes based on measurements of arm lengths and widths, then for aggregates of bullet rosettes and for unclassified (irregular) crystals. Derived bullet rosette masses are substantially greater than reported in existing literature, whereas measured projected areas are similar or lesser, resulting in factors of 1.5–2 greater fall speeds, and, in the limit of large Dmax, near-infrared single-scattering albedo and asymmetry parameter (g) greater by ~0.2 and 0.05, respectively. Furthermore, a model that includes commonly imaged side plane growth on bullet rosettes exhibits relatively little difference in microphysical and optical properties aside from ~0.05 increase in mid-visible g primarily attributable to plate aspect ratio. In parcel simulations, ice size distribution, and g are sensitive to assumed ice properties.},
doi = {10.5194/acp-16-7251-2016},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 11,
volume = 16,
place = {Germany},
year = {Fri Jun 10 00:00:00 EDT 2016},
month = {Fri Jun 10 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.5194/acp-16-7251-2016

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Cited by: 6 works
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