cloud occurrence at arctic atmospheric observatories matthew shupe, taneil uttal, daniel wolfe,...
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![Page 1: Cloud Occurrence at Arctic Atmospheric Observatories Matthew Shupe, Taneil Uttal, Daniel Wolfe, David Welsh AMS Polar Meteorology and Oceanography 2007](https://reader036.vdocument.in/reader036/viewer/2022062421/56649da15503460f94a8dcf1/html5/thumbnails/1.jpg)
Cloud Occurrence at Arctic Atmospheric Observatories
Matthew Shupe, Taneil Uttal, Daniel Wolfe, David Welsh
AMS Polar Meteorology and Oceanography 2007
Special Thanks for Ny’Alesund MPL Data:Masataka Shiobara, James Campbell
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Arctic Cloud StationsBarrow
SHEBA
Eureka
Alert
Ny’Alesund
Tiksi
Radar Lidar
An Example Station
Summit
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Site Instruments DatesSHEBA, Arctic Ocean Radar, lidar,
ceilometer1997-1998
Barrow, USA Radar, lidar, ceilometer
1998 – Present
Ny’Alesund, Norway Lidar 2002 – Present
Eureka, Canada Radar, lidar 2005 – Present
Alert, Canada Ceilometer ?
Tiksi, Russia None yet Not yet
Summit, Greenland None yet Not yet
Observatories
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Data Processing Considerations
• Use a combination of cloud radar and lidar, depending on station
• “Cloud fraction” is from the perspective of vertically-pointing, surface-based instruments
• All but SHEBA must be considered preliminary in nature, more detailed multi-instrument analyses will follow
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• Very cloudy in general at all stations (~75% total)• Summer/Fall maximum?
Total Cloud Fraction
Radar
Lidar
Surface observations
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Vertical Distribution
Bimodal Dist’n in Vertical
Lots of Low-level Clouds
Radar
Lidar
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Annual and Vertical Distribution
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• Instruments: radar, lidar, microwave radiometer, radiosonde.
• Manually classified. Automated system has been developed but not yet applied to all observations at all sites.
• 1 year of data at SHEBA and 7 years at Barrow.
Cloud Type Classification
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Annual Cycles of Cloud Type
• Mixed-phase clouds: Maxima in transition seasons.• Similar trends and magnitudes between SHEBA and Barrow
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Liquid is present throughout the year more than half of the time!
Occurrence of Cloud Liquid
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• Remarkable similarities• Slightly different balance at surface.
Vertical Distributions of Cloud Type
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Annual & Vertical Dist’n of Type
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• High annual fraction: ~75%• Remarkable similarities in vertical.• Similar dist’n of phase for W. Arctic sites. • Liquid is frequent (and important!)
• Radar-lidar combination at all sites.• Classification work at all sites using new algorithm.• More detailed analysis of boundaries
Conclusions
Future Work
Thank You.