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- W2892760810 abstract "Abstract Using lidar and radiative flux observations from space and ground, and a lidar simulator, we evaluate clouds simulated by climate models over the Greenland ice sheet, including predicted cloud cover, cloud fraction profile, cloud opacity, and surface cloud radiative effects. The representation of clouds over Greenland is a central concern for the models because clouds impact ice sheet surface melt. We find that over Greenland, most of the models have insufficient cloud cover during summer. In addition, all models create too few nonopaque, liquid-containing clouds optically thin enough to let direct solar radiation reach the surface (−1% to −3.5% at the ground level). Some models create too few opaque clouds. In most climate models, the cloud properties biases identified over all Greenland also apply at Summit, Greenland, proving the value of the ground observatory in model evaluation. At Summit, climate models underestimate cloud radiative effect (CRE) at the surface, especially in summer. The primary driver of the summer CRE biases compared to observations is the underestimation of the cloud cover in summer (−46% to −21%), which leads to an underestimated longwave radiative warming effect (CRE LW = −35.7 to −13.6 W m −2 compared to the ground observations) and an underestimated shortwave cooling effect (CRE SW = +1.5 to +10.5 W m −2 compared to the ground observations). Overall, the simulated clouds do not radiatively warm the surface as much as observed." @default.
- W2892760810 created "2018-10-05" @default.
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- W2892760810 date "2018-11-15" @default.
- W2892760810 modified "2023-10-12" @default.
- W2892760810 title "How Well Are Clouds Simulated over Greenland in Climate Models? Consequences for the Surface Cloud Radiative Effect over the Ice Sheet" @default.
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- W2892760810 doi "https://doi.org/10.1175/jcli-d-18-0023.1" @default.
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