| 1980年夏季华北干旱时期东亚阻塞形势的位涡分析 |
| |
| 引用本文： | 毕慕莹,丁一汇.1980年夏季华北干旱时期东亚阻塞形势的位涡分析[J].应用气象学报,1992,3(2):145-156. |
| |
| 作者姓名： | 毕慕莹 丁一汇 |
| |
| 作者单位： | 1.中国气象科学研究院
(毕慕莹)，中国气象科学研究院(丁一汇) |
| |
| 摘 要： | 本文用准地转位涡对1980年夏季（7月1日—9月10日）华北干旱时期东亚阻塞形势的平均特征及其维持机制进行了诊断分析。发现东亚阻塞高压是一个具有异常低位涡的深厚暖性反气旋系统。它的维持一方面与上游乌拉尔长波槽的涡旋强迫输送有关，另一方面，更为重要的与来自青藏高原上空的低位涡空气输送有关。准地转位涡的收支计算表明，涡动强迫作用与平均气流的平流作用基本上相平衡，因而涡动对位涡的输送是使阻塞区维持异常低的平均位涡，阻止阻塞高压向下游平流的重要机制。
|
| 关 键 词： | 位涡 阻塞形成 干旱时间 夏季 |
A Study of Budget of Potential Vorticity of Blocking High During the Drought Period in Summer of 1980 |
| |
| Institution: | (Chinese Academy of Meteorological Sciences, SMA) |
| |
| Abstract: | A diagnostic study of the average characteristics and maintenance mechanism of the blocking situation in East Asia during the drought period in summer of 1980 (1 July－10 September) has been made by use of quasi-geostrophic potential vorticity equation. It has been shown that the blocking high in East Asia is a kind of deep and warm anticyclonic system of unusually low potential vorticity. On the one hand, its maintenance is related to the eddy transport resulting from the long wave trough in the Ural region upstream, on the other hand, and more importantly, it is associated with the transport of the air of low potential vorticity originating in the Tibetan Plateau. The estimate of budget of potential vorticity has further indicated that the eddy forcing term is nearly balanced out by the advection term of the mean flow. This face implies that the eddy transport of potential vorticity may be an important factor responsible for maintenance of unusually low potential vorticity in the blocking area and prohibiting the blocking high from the downstream advection. |
| |
| Keywords: | |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《应用气象学报》浏览原始摘要信息 |
| 点击此处可从《应用气象学报》下载免费的PDF全文 |
