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Atmosphere 2018, 9(11), 445; https://doi.org/10.3390/atmos9110445

An Investigation of Optically Very Thin Ice Clouds from Ground-Based ARM Raman Lidars

Department of Atmospheric Sciences, University of Washington, Seattle, WA 98195, USA
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Received: 30 July 2018 / Revised: 24 October 2018 / Accepted: 12 November 2018 / Published: 14 November 2018
(This article belongs to the Special Issue Cloud Radiative Processes and Effect)
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Abstract

Optically very thin ice clouds from the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) and ground-based Raman lidars (RL) at the atmospheric radiation measurement (ARM) sites of the Southern Great Plains (SGP) and Tropical Western Pacific (TWP) are analyzed. The optically very thin ice clouds, with ice cloud column optical depths below 0.01, are about 23% of the transparent ice-cloudy profiles from the RL, compared to 4–7% from CALIPSO. The majority (66–76%) of optically very thin ice clouds from the RLs are found to be adjacent to ice clouds with ice cloud column optical depths greater than 0.01. The temporal structure of RL-observed optically very thin ice clouds indicates a clear sky–cloud continuum. Global cloudiness estimates from CALIPSO observations leveraged with high-sensitivity RL observations suggest that CALIPSO may underestimate the global cloud fraction when considering optically very thin ice clouds. View Full-Text
Keywords: remote sensing; lidars; ice cloud optical depth; ice cloud detection remote sensing; lidars; ice cloud optical depth; ice cloud detection
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Balmes, K.A.; Fu, Q. An Investigation of Optically Very Thin Ice Clouds from Ground-Based ARM Raman Lidars. Atmosphere 2018, 9, 445.

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