摘要
为了了解来自低纬度的气象因素对梅雨带季节内变化的影响 ,文中对 1 985年和 1 986年6～ 7月份的个例进行了细致诊断 ,并针对有关问题用历史资料做了统计和合成。发现 (1 )梅雨雨带的向北位移与 1 0～ 1 5°N/ 1 4 0°E附近的热带对流云团向西移动有连带关系 ,当热带对流云团向西北移动时副热带高压也向西北扩张 ,顺次由东向西影响梅雨带北抬。(2 )低纬度向西北方向移动的对流云团具有准 8,1 8以及 30 d周期。 (3)中国江淮梅雨的入梅也与 6月份第一次出现这种对流云团周期性 (8,1 8以及 30 d)
In order to investigate the effect by the meteorological factors from lower latitudes on Meiyu/Baiu front, a diagnostic analysis for the two cases during June to July of 1985 and 1986 was examined. We found that (1) when the tropical convective activity westward moving near 10-17°N,140°E from east side(10-17°N,160°E), the northward shift of the Meiyu/Baiu rain belt occur. (2) the onsets of Meiyu in China of both cases took place just when the convective activity around lower latitudes moved westward through ～140°E with the 20-30 days oscillation period at the first time in June. (3) the main factor which results in the northward and southward shift of Meiyu/Baiu rain belt is thought as the 20-30 day oscillation of the tropical convective activity around West Pacific. (4) the Rossby wave propagation which is excited by the convective activity around Philippine occurred only in late summer and did not give any impact to the intraseasonal variation of the Meiyu/Baiu rain belt in the both cases.
出处
《气象学报》
CSCD
北大核心
2000年第6期692-703,共12页
Acta Meteorologica Sinica
基金
自然科学基金委重大项目:"能量与水分循环试验的研究项目资助 (No.49794030)
人事部非教育系统留学回国人员科技活动择优资
关键词
热带对流云团
梅雨带
低频振荡
TBB场
环流场
Tropical convective activity
Meiyu / Baiu rain belt
Low-frequent oscillation
