Cloud Occurrence at Arctic Atmospheric Observatories Matthew Shupe, Taneil Uttal, Daniel Wolfe, David Welsh AMS Polar Meteorology and Oceanography 2007.

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Presentation transcript:

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

Arctic Cloud Stations Barrow SHEBA Eureka Alert Ny’Alesund Tiksi RadarLidar An Example Station Summit

SiteInstrumentsDates SHEBA, Arctic OceanRadar, lidar, ceilometer Barrow, USARadar, lidar, ceilometer 1998 – Present Ny’Alesund, NorwayLidar2002 – Present Eureka, CanadaRadar, lidar2005 – Present Alert, CanadaCeilometer? Tiksi, RussiaNone yetNot yet Summit, GreenlandNone yetNot yet Observatories

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

Very cloudy in general at all stations (~75% total) Summer/Fall maximum? Total Cloud Fraction Radar Lidar Surface observations

Vertical Distribution Bimodal Dist’n in Vertical Lots of Low-level Clouds Radar Lidar

Annual and Vertical Distribution

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

Annual Cycles of Cloud Type Mixed-phase clouds: Maxima in transition seasons. Similar trends and magnitudes between SHEBA and Barrow

Liquid is present throughout the year more than half of the time! Occurrence of Cloud Liquid

Remarkable similarities Slightly different balance at surface. Vertical Distributions of Cloud Type

Annual & Vertical Dist’n of Type

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.