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AMT | Articles | Volume 12, issue 2
Atmos. Meas. Tech., 12, 1295–1309, 2019
https://doi.org/10.5194/amt-12-1295-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Atmos. Meas. Tech., 12, 1295–1309, 2019
https://doi.org/10.5194/amt-12-1295-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 28 Feb 2019

Research article | 28 Feb 2019

Halo ratio from ground-based all-sky imaging

Paolo Dandini et al.

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Allmen, M. and Kegelmeyer Jr., W. P.: The computation of cloud-base height from paired whole-sky imaging cameras, J. Atmos. Ocean. Tech., 13, 97–113, https://doi.org/10.1175/1520-0426(1996)013<0097:TCOCBH>2.0.CO;2, 1996. 
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Baran, A. J. and Labonnote, L. C.: A self consistent scattering model for cirrus, I: the solar region, Q. J. Roy. Meteor. Soc., 133, 1899–1912, https://doi.org/10.1002/qj.164, 2007. 
Baran, A. J., Furtado, K., Labonnote, L.-C., Havemann, S., Thelen, J.-C., and Marenco, F.: On the relationship between the scattering phase function of cirrus and the atmospheric state, Atmos. Chem. Phys., 15, 1105–1127, https://doi.org/10.5194/acp-15-1105-2015, 2015. 
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The halo ratio indicates the strength of the 22° cirrus halo and gives valuable information on cloud properties. We obtain it from all-sky images by applying a range of transformations and corrections and averaging brightness azimuthally over sun-centred images. The ratio is then taken at two angles from the sun, 20° and 23°, in variance from previous suggestions. While we find ratios > 1 to be linked to halos, they can also occur under scattered cumuli as artefacts due to cloud edges.
The halo ratio indicates the strength of the 22° cirrus halo and gives valuable information on...
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