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32nd Annual Arctic Workshop Abstracts
March 14-16, 2002
INSTAAR, University of Colorado at Boulder

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RADIATION CLIMATOLOGY OF THE GREENLAND ICE SHEET DERIVED FROM IN-SITU MEASUREMENTS 1995-2002

AUTHORS

BOX, JASON E. CIRES/Greenland Climate Network.

Visible and infrared radiation fluxes represent the primary energy source for melt and evaporation at the surface of the Greenland ice sheet. The annual cycle of hourly radiation measurements from twenty Greenland Climate Network (GC-Net) automated measurement sites were integrated into a radiation climatology of the Greenland ice sheet spanning 1995 to 2002. Using trend surface regression, a set of monthly radiation grids/maps for the Greenland ice sheet were created for: downwelling and reflected shortwave; downwelling and emitted longwave; net shortwave; net longwave; and net allwave radiation components. These models are validated with precise measurements from Swiss Camp at equilibrium line altitude (1150 m) and from the Summit of the ice cap (3208 m). Cloud frequency, effective cloud opacity, energy available for melt, and albedo grids/maps are available based on the radiation data. Other parameters such as temperature and specific humidity are also available as gridded models since they were required to construct the longwave radiation grids.

 

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