Continental-Scale Simulation of the Antarctic Katabatic Wind Regime
Continental-Scale Simulation of the Antarctic Katabatic Wind Regime
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DOI：
10.1175/1520-0442(1991)004
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发表时间：
1991-02
影响因子：
4.9
通讯作者：
T. Parish;D. Bromwich
中科院分区：
文献类型：
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作者：
T. Parish;D. Bromwich
摘要 下降风是南极低层大气的一个常见特征。尽管这些下坡气流很浅，但越来越多的证据表明，低层环流是在南半球高纬度地区建立大规模对流层运动的一个重要组成部分。对整个南极大陆的南极下降风状况及相关的对流层环流进行了三维数值模拟，以描绘大气近地表层中地形强迫的排水模式。模拟结果能够绘制下降风势图，并确定可能出现异常强烈下降风的沿海地区。一个大型的高层气旋环流会随着低层大气中不断演变的下降风结构迅速形成，这表明排水环流是决定最终形成的极地涡旋的一个重要组成部分。这些结果意味着……
Abstract Katabatic winds are a common feature of the lower Antarctic atmosphere. Although these drainage flows are quite shallow, there is increasing evidence that the low-level circulations are an important component in establishing large-scale tropospheric motions in the high southern latitudes. Three-dimensional numerical simulations of the Antarctic katabatic wind regime and attendant tropospheric circulations have been conducted over the entire continent to depict the topographically forced drainage patterns in the near-surface layer of the atmosphere. Results of the simulation enable a mapping of katabatic wind potential and identification of coastal regions which may experience anomalously intense katabatic winds. A large upper-level cyclonic circulation forms rapidly in response to the evolving katabatic wind structure in the lower atmosphere, suggesting that the drainage circulations are an important component in prescribing the resulting resulting circumpolar vortex. These results imply that som...