摘要
从不同时间尺度大气环流异常角度研究了江淮流域的汛期多雨和少雨情况，结果表明准定常行星波的异常对江淮流域旱涝有较为明显的影响；大气低频系统（准双周和季节内振荡）也有相当重要的作用，且以对流层高层（２００ｈＰａ）的准双周振荡和对流层低层（８５０ｈＰａ）的季节内振荡的影响更为清楚；天气尺度扰动对汛期降水量异常的影响相对较小。低层准定常西南气流的强度与位置对旱涝的影响很大，若准定常西南气流强且偏向大陆，易造成江淮流域偏涝；若准定常西南气流弱或偏向大陆以东的洋面上，则江淮流域易旱。
The drought and flood in the Changjiang-Huaihe River basin are studied from the riewpoint of multi-time-scale anomalous circulation. It is demonstrated that anomalous quasi-stationary wave influence is very important. The low frequency oscillation is also important and the influence of 10-20 days oscillation at 200 hPa and intraseasonal oscillation at 850 hPa is obvious. And the influence of synoptic scale system (3-10 days) is small compared to that of the low frequency oscillation and quasi-stationary wave. It is also found that the strength and position of southwest quasi-stationary flow in east Asia and northwestern Pacific area play an important role in the occurrence of drought and flood in the Changjiang-Huaihe River basin. If the southwest quasi-stationary flow is strong and has tendency to continent, there will be flood in the Changjiang-Huaihe River basin. If the southwest quasi-stationary flow is weak and has tendency to the ocean, there will be drought in the Changjiang-Huaihe River basin.
出处
《大气科学》
CSCD
北大核心
1999年第1期39-50,共12页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金资助
国家攻关计划96-908资助
