Classification and Composite Diagnosis of Extratropical Cyclogenesis Events in the Southwest Pacific
Classification and Composite Diagnosis of Extratropical Cyclogenesis Events in the Southwest Pacific
复制标题
西南太平洋温带气旋事件的分类与综合诊断
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
M. Revell
中科院分区：
文献类型：
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作者：
M. Sinclair;M. Revell
从1990 - 1994年的40个发展中的气旋样本中确定了西南太平洋地区气旋形成的特征模式。案例的选择是客观的，以确保典型事件的真实抽样，而不是“理想”事件。基于气旋增强前天气尺度对流层上层气流特征的主观分类表明，除了三种情况外，其他情况都属于四类。有三种类型，每一种包含大约四分之一的人口，与上层喷射直接相关。它们代表了(i) 300 hpa急流从分流槽上游的极向出口区域（U类），（ii）上层风最大值的辐合赤道入口区域（E类），以及（iii）急流从上槽下游的上层急流出口区域（D类）下的气旋形成。这些类似于以前确定的北大西洋西部区域的类别。第四类是在先前存在的强烈上升气流下形成的气旋。
Abstract Characteristic patterns of cyclogenesis in the southwest Pacific region are identified from a sample of 40 developing cyclones during 1990–94. Cases were chosen objectively to ensure a realistic sampling of typical rather than “ideal” events. A subjective classification based on synoptic-scale upper-tropospheric flow signatures prior to cyclone intensification suggested four classes into which all but three cases fell. Three categories, each containing about a quarter of the population, involved direct coupling with the upper jet. They represent cyclone formation beneath (i) the poleward exit region of a 300-hPa jet upstream from a diffluent trough (class U), (ii) the confluent equatorward entrance region of the upper wind maximum (E), and (iii) the upper jet exit region where the jet is downstream from the upper trough (class D). These are analogous to previously identified categories for the western North Atlantic region. A fourth class involved cyclones forming beneath a preexisting intense up...