北半球冬季环流异常对我国东北夏季长期天气过程的影响

INFLUENCE OF NORTHERN WINTER ATMOSPHERIC CIRCULATION ANOMALIES ON LONG RANGE WEATHER PROCESSES OVER NE CHINA

用北半球１４个冬季的５００ｈＰａ候距平高度场和１４个夏季东北地区温度和降水候距平资料，分析了冬季环流异常对次年夏季温度和降水异常的影响，发现北半球冬季环流异常的显著区与冬季大气活动中心或超长波槽脊相联系；与我国东北地区夏季温度和降水异常关系密切。在ＥｌＮｉｎｏ和反ＥｌＮｉｎｏ年，这种现象更为明显。

In terms of 500 hPa pentad height departures of 14 northern winters and pentaddepartures of temperature and rainfall of 14 summers for NE China,analysis is carried out ofthe effects of the anomaly of the winter circtilations on that of temperature and rainfall in thefollowing summer for NE China,indicating that the strong- anomaly areas of the winter circu-lations are linked to the centers of atmospheric action or ultralongwave trough/ridge at thesame season. Moreover,correlation analysis shows that the strong-anomaly areas are inti-mately associated with the abnormality of temperature and precipitation in the followingsummer over NE China,This teleconnedtion of large scale circulation on a 6-month scale isrealized with the aid of PNA and EU wavetrains that cause the anomalies of low-latitude andextratropical atmospheric circulations to be related to and influenced by each other, particu-larlv in El Nino and anti-El Nino years.