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Contrasting GCM simulations of Arctic Mixed Phase Boundary Layer Clouds with Observations from a Tethered Balloon Platform
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  • Monika Sikand,
  • David Paynter,
  • V Ramaswamy,
  • Stephan Fueglistaler
Monika Sikand
CUNY Bronx College

Corresponding Author:[email protected]

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David Paynter
NOAA GFD Lab-Princeton University
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V Ramaswamy
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Stephan Fueglistaler
Princeton University
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Mixed phase clouds, consisting of ice particles and super cooled liquid droplets, predominantly found in Arctic, are poorly represented in various climate models. A unique tethered balloon campaign carrying 4π radiometer, a cloud particle imager, and a meteorological package on board was conducted in Ny-Ålesund, Norway, located high in the Arctic at 78.91°N, 11.91°E during May-June 2008. The radiometric and cloud observations at 500nm and 800nm were collected during a month long experimental campaign. A state-of-the-art discrete ordinate radiative transfer model was used to estimate optimal cloud optical properties. These optical properties are contrasted with those of the cloud parameterization in the new NOAA-GFDL AM4 model that is presently being used in the Coupled Model Intercomparison Project 6 (CMIP6). The improved simulation of cloud optical properties will aid in understanding cloud radiation feedbacks and better representation of clouds in global climate model.