Performance of optical sensors for cloud measurements deployed by the ARM Aerial Facility during ACE-ENA

During the Aerosol and Cloud Experiment in the Eastern North Atlantic (ACE-ENA), a variety of in situ optical sensors using shadow imaging, scattering and holography were deployed by the Atmospheric Radiation Measurement (ARM) Aerial Facility to determine cloud properties. Taking advantage of the wi...

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Bibliographic Details
Published in:Applied optics (2004) 2023-07, Vol.62 (19), p.5282
Main Authors: Glienke, Susanne, Allwayin, Nithin, Mei, Fan, Comstock, Jennifer M., Shaw, Raymond A., Tomlinson, Jason, Schmid, Beat
Format: Article
Language:English
Subjects:
Atmospheric radiation
Clouds
Data processing
Droplets
Holography
Measurement methods
Moisture content
Optical measuring instruments
Radiation measurement
Shadows
Water
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Summary:During the Aerosol and Cloud Experiment in the Eastern North Atlantic (ACE-ENA), a variety of in situ optical sensors using shadow imaging, scattering and holography were deployed by the Atmospheric Radiation Measurement (ARM) Aerial Facility to determine cloud properties. Taking advantage of the wide, overlapping range of instrumentation, we compare in situ cloud data from several different measurement methods for droplets up to 100 µm. Data processing was tailored to the encountered conditions, leading to good agreement. Improvements include noise reduction for holography and better out-of-focus correction for shadow imaging. Comparison between direct liquid water content measurements and optical sensors showed better agreement at higher droplet number concentrations (>120/cm 3 ).
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.491401