Multiple-Doppler Radar Observations of the Evolution of Vorticity Extrema in a Convective Boundary Layer
Multiple-Doppler Radar Observations of the Evolution of Vorticity Extrema in a Convective Boundary Layer
复制标题
对流边界层涡度极值演化的多普勒雷达观测
DOI：
10.1175/mwr3060.1
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
C. Hannon
中科院分区：
文献类型：
--
作者：
P. Markowski;C. Hannon
摘要超定，双多普勒风合成被用来记录2002年6月12日国际H2O项目（IHOP）使命期间在对流边界层中观察到的垂直涡度极值的演变，结构和动力学。水平尺度为1-2公里的离散垂直涡度极值可以连续观测超过一小时。涡度场的演变具有涡度极值之间以及垂直涡度场与垂直速度场之间复杂的相互作用的特点。最显著的涡度最大值的振幅约为0.01 s-1，与反演的0.1 mb量级的压力差有关。在垂直风切变存在时，涡度极值随高度和倾斜的增加而减弱。平流和传播都对涡度极值的运动有很大的贡献。垂直涡度的放大与上升气流的增强密切相关。拉伸和倾斜都可以有助于显着...
Abstract Overdetermined, dual-Doppler wind syntheses are used to document the evolution, structure, and dynamics of vertical vorticity extrema observed in a convective boundary layer during the 12 June 2002 International H2O Project (IHOP) mission. Discrete vertical vorticity extrema having horizontal scales of 1–2 km can be observed continuously for periods exceeding an hour. The evolution of the vorticity field is characterized by complex interactions among vorticity extrema and between the vertical vorticity and vertical velocity fields. The most prominent vorticity maxima have amplitudes of approximately 0.01 s−1 and are associated with retrieved pressure deficits of order 0.1 mb. The vorticity extrema weaken with height and tilt in the presence of vertical wind shear. Advection and propagation both contribute substantially to the motion of the vorticity extrema. Amplifications of vertical vorticity are closely linked to the intensification of updrafts. Both stretching and tilting can contribute signi...