1961—2010年东北地区夏季降水时空变化的研究

东北地区地处中高纬欧亚大陆东岸，处在东亚季风区的边缘，其降水主要集中在夏季，并且降水量具有显著的地域差异和年际变化。研究东北夏季降水特点，可为降水预报、气候预测和农业生产提供可靠依据。本文利用东北地区27个测站1961—2010年夏季逐月降水资料，通过E-OF和小波分析的方法研究东北地区夏季降水的时空变化规律，结果表明：东北地区夏季降水量主要表现为三种空间分布型：总体一致型、南-北反位相型以及东南-西北反位相型；东北地区夏季降水量存在明显的年际变化，降水变化周期为8—11a；东北地区夏季各月降水量的差异，主要是由地形原因和纬线跨度差异造成的。

Temporal and spatial variation research of the summer precipitation in the Northeast of China from 1961 to 2010

The Northeast is .located in the east coast of high-latitude Eurasia continent, along the monsoon boundary zone. The precipitation in the northeast concentrated in summer and its distribution has significant re- gional differences and interannual variations. The characteristics research of summer precipitation can provide re- liable basis for the precipitation forecast, climate prediction and agricultural production. Based on the monthly summer precipitation data of 1961-2010 from 27 stations, the temporal and spatial distribution of summer pre- cipitation in Northeast is analyzed by applying the empirical orthogonal function （EOF） and wavelet analysis. The results show that： the spatial distribution of summer precipitation in Northeast has three patterns： the overall con- sistent, South - North anti-phase and Southeast - Northwest anti-phase; Northeast summer precipitation has obvious interannual variability and the cycle is 8-11 years. The monthly difference of Northeast precipitation in summer was mainly caused by the terrain and latitude span difference.