Climate and Forecast Mode Simulations for Antarctica: Implications for Temperature and Wind |
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Authors: | XIN Yufei Annette RINKE BIAN Lingen Klaus DETHLOFF XIAO Cunde and Moritz MIELKE |
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Institution: | Chinese Academy of Meteorological Sciences, Beijing 100081,Alfred Wegener Institute for Polar and Marine Research, D-14473 Potsdam, Germany,Chinese Academy of Meteorological Sciences, Beijing 100081,Alfred Wegener Institute for Polar and Marine Research, D-14473 Potsdam, Germany,Chinese Academy of Meteorological Sciences, Beijing 100081,Alfred Wegener Institute for Polar and Marine Research, D-14473 Potsdam, Germany |
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Abstract: | Climate and forecast mode simulations with the regional climate model
HIRlam-ECHAM(HIRHAM) are evaluated over a pan-Antarctic domain. The ability
of the model to simulate temperature and wind profiles in the troposphere is
quantified by comparing its results with radiosonde data acquired from the
Davis station for January and July 2007. Compared to the climate mode, the
forecast mode was found to deliver improved results for temperature and wind
simulations at the near surface and in the lower troposphere. The main
remaining model bias found was the under-representation of low-level wind
jets. Based on ensemble simulations, it is shown that a distinct internal
variability is inherent in the climate mode simulations, and associated
areas of reduced predictability over Antarctica are identified. |
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Keywords: | regional climate model Antarctica forecast mode climate mode |
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