The Influence of the Andes Cordillera on Transient Disturbances
The Influence of the Andes Cordillera on Transient Disturbances
复制标题
安第斯山脉对瞬态扰动的影响
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
V. B. Rao
中科院分区：
文献类型：
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作者：
M. Gan;V. B. Rao
摘要本文采用滞后相关分析方法研究了安第斯山脉对瞬态扰动的影响。分析表明，未经滤波的位势高度数据在垂直方向上呈现出向东移动而向西倾斜的波浪形模式。当波接近安第斯山脉时，它表现出地形效应，如低水平扰动轨迹的反气旋转向，高层的纬向轨迹，相关等值线的扭曲，以及安第斯山脉背风侧最大相关的延伸。低空轨道的反气旋转向和高空的纬向轨道表明系统迎风侧垂直倾斜度减小，背风侧倾斜度增大。背风侧斜压性的增加导致斜压发展，正如在有山的情况下线性得到的正态解所预测的那样。…的互相关分析。
Abstract The influence of the Andes Cordillera on transient disturbances is investigated in this study using a lag-correlation analysis. This analysis shows that the unfiltered geopotential height data have a wavelike pattern moving to the east while tilting to the west in the vertical. When the wave approaches the Andes Cordillera, it exhibits orographic effects such as anticyclonic turning of a low-level disturbance trajectory, a zonal trajectory in the upper levels, distortions of the isolines of correlation, and an elongation of maximum correlation on the lee side of the Andes. The anticyclonic turning of the trajectory in the low-attitude levels and a zonal trajectory in upper levels implies a decrease in the vertical tilt of the system on the windward side and an increase in the tilt on the lee side. The increase of baroclinicity on the lee side results in baroclinic development as predicted from a linearly obtained normal-mode solution in the presence of mountains. A cross-correlation analysis of t...