摘要
分析表明 ,1997年汛期 5 0 0hPa中纬度地区盛行纬向环流 ,西风带冷空气路径偏北、偏弱 ;盛夏期间黄河流域先后受贝加尔湖阻塞高压和青藏高原高压控制 ;副高偏北、偏西 ;台风异常偏少。正是受上述主要环流系统的影响 ,1997年汛期黄河流域出现了持续性严重干旱 ,黄河下游利津站出现了有资料记录以来主汛期最长断流时间和最多断流次数。
It is shown with analysis that zonal circulation prevailed at 500hPa in the middle latitude during flood season in 1997, the cold air over westerly belt turned weaker and moved northward. Baikal Lake blocking high and Qinghai-Xizang high covered the Yellow River Basin in the flood season during midsummer. The subtropical high moved northward and westward. Typhoon appeared fewer abnormally. Effected by the key circulation system mentioned above, the continuous serious arid occurred in the Yellow River Basin during flood season in 1997, which lead to the flow cut-off days and times in Lijin station during flood season is at most since data recorded.
出处
《河南气象》
2000年第3期22-24,共3页
Meteorology Journal of Henan
