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首页> 外文期刊>Boundary-layer Meteorology >NUMERICAL STUDIES WITH A REGIONAL ATMOSPHERIC CLIMATE MODEL BASED ON CHANGES IN THE ROUGHNESS LENGTH FOR MOMENTUM AND HEAT OVER ANTARCTICA
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NUMERICAL STUDIES WITH A REGIONAL ATMOSPHERIC CLIMATE MODEL BASED ON CHANGES IN THE ROUGHNESS LENGTH FOR MOMENTUM AND HEAT OVER ANTARCTICA

机译：基于南极动量和热粗糙强度变化的区域大气气候模型的数值研究

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A regional atmospheric climate model is used to examine the effect of changes in the roughness lengths of momentum (z_(0m)) and heat (z_(0h)) on the structure of the lower atmosphere and on the surface energy fluxes over Antarctica Four experiments were carried out in which z_(0m) and/or z_(0h) were altered with respect to a control experiment. The changes consisted of (1) a lowering of z_(0m) from a field aggregated from a vegetation map with an orographic correction based on the European Centre forMedium-Range Weather Forecasts z_(0m) field, to a constant value of 10~(-3) m; and (2) a lowering of z_(0h) from a value equal to z_(0m) to a constant value of 10~(-3) m or a value dependent on the wind speed via a surface renewal model. A reduction ofz_(0m) results in the expected increase in near-surface wind speed. It also results in an increase in the depth of the layer in which southeasterly near-surface winds prevail, and in a decrease in the strength of the large-scale flow over the continent,in particular in summer. In the escarpment region a decrease of z_(0m) is found to result in too high wind speeds. Surface temperatures on average decrease while atmospheric temperatures increase, resulting in an increase of near-surface static stability. Changes in roughness lengths do not significantly change the temperature profiles. The surface fluxes, on average found reduced, are modelled best by using the z_(0h) based on the surface renewal method.
机译：区域大气气候模型用于检验动量粗糙度长度（z_（0m））和热量（z_（0h））的变化对南极低层大气结构和表面能通量的影响四个实验相对于对照实验，其中z_（0m）和/或z_（0h）被改变。这些变化包括（1）将根据欧洲中距离天气预报中心z_（0m）的地形校正从植被图汇总的字段中的z_（0m）降低为恒定值10〜（ -3）米; （2）通过表面更新模型将z_（0h）从等于z_（0m）的值降低到恒定值10〜（-3）m或取决于风速的值。 z_（0m）的减小导致预期的近地表风速增加。这还会导致东南近地风盛行的层的深度增加，并导致整个大陆的大规模水流强度降低，特别是在夏季。在陡峭区域，发现z_（0m）的减小会导致风速过高。随着大气温度的升高，表面温度平均会下降，从而导致近表面静态稳定性的提高。粗糙度长度的变化不会明显改变温度曲线。通过使用基于表面更新方法的z_（0h），可以最好地模拟平均发现减少的表面通量。

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