东亚温带低气压路径

THE TRACKS OF THE EXTRATROPICAL CYCLONES IN EASTERN ASIA

中文摘要:

      本文利用1951—1960年的亚洲地面天气图,分月統計东亚地区(70°E以东,55°N以南)每2.5°×2.5°經緯格內低压中心通过的頻数,繪制了頻数分布图,确定出低压移动的主要路径,此外,还繪制了冬半年和夏半年低压发生(初現)頻数分布图、頻数百分率的随緯度分布和沿120°E与110°E經线上低压中心通过頻数的各月綜合图.結果得出:1.东亚大陆中緯度西风带的低压主要出現在蒙古人民共和国中部到我国的东北地区,20°N以南不出現溫带低气压;2.45°N以南的我国大陆上低压很弱,大多数不閉合,只有在我国东部或入海后才发展;3.日本东南面海上是低压路径的集中带;4.春季低压出現最为頻繁,秋季次之,夏季我国江淮流域低压有所增多. 最后,对低压路径进行了分类,把东亚的溫带低气压划为五大类和十一亚类,并对各类低压分别作了簡要的叙述.

英文摘要:

      Based on the. 10-years surface synoptic charts (1951 to 1960),monthly frequencies of cyclones and low pressure centers passing 2.5°×2.5° latitude-longitude grids in Eastern Asia are analized and the main tracks are studied and classified. The cyclones are most frequent in middle part of Mongolia and north-east China, and none south of 20°N. Most of the low pressures occurred south of 45°N are very weak. Spring is the season of cyclonic activity.