Analysis of an Idealized, Three-Dimensional Diabatic Rossby Vortex: A Coherent Structure of the Moist Baroclinic Atmosphere
Analysis of an Idealized, Three-Dimensional Diabatic Rossby Vortex: A Coherent Structure of the Moist Baroclinic Atmosphere
复制标题
理想化三维非绝热罗斯贝涡旋的分析：潮湿斜压大气的相干结构
DOI：
10.1175/jas3472.1
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发表时间：
2005
影响因子：
3.1
通讯作者：
M. Montgomery
中科院分区：
文献类型：
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作者：
R. Moore;M. Montgomery
摘要利用美国宾夕法尼亚州立大学-国家大气研究中心（PSU-NCAR）第五代中尺度模式（MM 5）进行了一系列理想化的数值模拟，以证实最近发现的一种在潮湿斜压环境中替代传统斜压不稳定性的增长机制。在这种交替增长情景中，扰动增长取决于足够的环境湿度和斜压性的存在。由此产生的相干结构，被称为非绝热Rossby涡（DRV），增长的结果近似锁相和相互放大的两个非绝热产生的位涡（PV）异常：低层正（气旋）PV异常和对流层中层负（反气旋）PV异常。DRV的三维结构被发现是定性非常相似，在以前的二维模型模拟中看到的。最明显的结构差异从二维模型是增加的s…
Abstract The fifth-generation Pennsylvania State University–National Center for Atmospheric Research (PSU–NCAR) Mesoscale Model (MM5) is used to conduct a number of idealized numerical simulations to confirm recent findings of an alternate growth mechanism in a moist baroclinic environment to that of traditional baroclinic instability. In this alternate growth scenario, disturbance growth depends on the presence of sufficient environmental moisture and baroclinicity. The resulting coherent structure, termed a diabatic Rossby vortex (DRV), grows as a result of an approximate phase locking and mutual amplification of two diabatically generated potential vorticity (PV) anomalies: a low-level positive (cyclonic) PV anomaly and a midtropospheric negative (anticyclonic) PV anomaly. The three-dimensional structure of a DRV is found to be qualitatively very similar to that seen in previous two-dimensional model simulations. The most apparent structural discrepancy from the two-dimensional model is the increased s...