摘要
对５００ｈＰａ位势高度场逐日资料进行带通滤波分析，从而确定了风暴轴各月平均的强度和位置，分析了风暴轴和同一层次急流的时间演变特征以及它们之间的关系。结果表明：太平洋和大西洋风暴轴的强度和摆动都存在着明显的月际变化，即夏季强度最弱，位置偏北；冬季强度最强，位置偏南。在大多数情况下，风暴轴位于急流极大值下游向极地一侧。还发现，急流核和风暴轴都存在断裂现象，在太平洋上，风暴轴还出现双中心现象。
In terms of bandpass filtered 500 hPa daily geopotential height data,the monthlymean strength and position of the storm tracks are defined,followed by analysis of the time-varying evolution of the tracks and the jet at the same level along with their relation. Resultsshow that the Pacific and Atlantic storm tracks have significant intermonthly variation intheir strength and north- and southward location. They are weakest(strongest)in summer(winter),lying northward(southward)of normal position. In most cases,they are positionedbowartream and poleward of the cores of the jets. Also,breakdown is found both in the jetsand storm tracks, Interestingly,the storm track is sometimes bi-cored over the Pacific.
出处
《南京气象学院学报》
CSCD
1994年第2期165-170,共6页
Journal of Nanjing Institute of Meteorology
基金
国家重大关键项目
关键词
风暴轴
急流
结构特征
时间演变
storm track,jet,temporal evolution characteristics,bandpass filtering analysis
