Airborne Radar Observations of a Cold Front during FASTEX1
Airborne Radar Observations of a Cold Front during FASTEX1
复制标题
FASTEX1 期间机载雷达对冷锋的观测
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
Brian L. Bosart
中科院分区：
文献类型：
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作者：
R. Wakimoto;Brian L. Bosart
摘要 使用机载多普勒雷达对与降水核心和间隙区域相关的海洋冷锋进行了详细分析。降水核心的形成似乎是水平剪切不稳定和核心相对风造成的水凝物平流综合作用的结果。与之前的示意图模型相比，结果表明沿降水核心的整个长度不存在强烈的表面不连续性。核心的南段可能伴随着突然的不连续性和较轻的降水，而北段可能伴随着更缓慢变化的变量但降水较多。锋面前缘的峰值上升气流似乎主要是由边界层中的摩擦收敛和垂直涡度加速驱动的。尽管冷锋的运动结构类似于冷锋的运动结构，但使用密度流理论并不能很好地预测冷锋的整体运动。
Abstract A detailed analysis using airborne Doppler radars of an oceanic cold front associated with precipitation core and gap regions is presented. The precipitation cores appear to form as a result of the combined effects of horizontal shearing instability and the advection of hydrometeors by the core-relative winds. In contrast to previous schematic models, it is shown that a strong surface discontinuity does not exist along the entire length of the precipitation core. The southern section of the core can be accompanied by an abrupt discontinuity and lighter precipitation while the northern section can be associated with more slowly changing variables but heavier precipitation. The peak updrafts at the leading edge of the front appeared to be primarily driven by frictional convergence and the acceleration of the vertical vorticity in the boundary layer. The overall motion of the cold front was not well predicted using density current theory even though the kinematic structure of the front resembled cla...