华北汛期旱涝前期月平均环流异常的遥相关型

TELECONNECTION PATTERN OF MONTHLY MEAN CIRCULATION ANOMALY IN RELATION TO THE RAINFALL IN THE PERIOD PREVIOUS TO THE WET OR DRY SEASON OF NORTH CHINA

研究了华北汛期旱涝前期月平均环流异常的遥相关型结构特征,分析了华北地区汛期旱涝及其温度异常前期大气环流型的遥相关关系。结果表明,华北汛期旱涝现象与前期遥相关经向波列特征密切相关。通过滤波尺度分离方法,清晰地描述出准定常行星波尺度的PNA、EAP型遥相关波列与华北汛期旱涝及其温度异常的相互联系,进一步揭示华北汛期旱涝前期遥相关经向波列的传播能量路径及其机制。

The paper investigates the teleconnection pattern features of the monthly mean circulation abnormality in the period previous to the wet or dry season with abundant or little precipitation and the teleconnection relationship between the atmospheric circulation pattern and the subsequent dryness/ wetness and temperature anomaly in North Chinal results show that the rainfall quantity bears a close relation to the meridional wavetrain characteristics of the previous-period teleeonnection. By a filtering scale dissociation technique the link between the quasi-stationary planetary PNA and EAP teleconnection wavetrain and the rainfall and temperature abnormalities in the wet season is described, further revealing the energy propagating path with its mechanism of the meridional wavetrain prior to the advent of the rainy span.