摘要
由于近几十年来华北干旱频繁发生,给农牧业生产造成很大影响,因此,如何寻找影响华北夏季(6~8月)降水的预报因子就显得至关重要。本研究的目的就是提出气候场的主分量回归预测模型,对1951-2001年华北夏季降水的变化特征进行拟合并预报。研究发现,所选取的70个预报因子分别为高度场、海温场和海平面气压场不同区的前2个主分量,所建立的回归预报方程反映出在夏季来临的前2个月,海平面气压场的变化对华北夏季降水具有一定的影响,特别是海平面气压场的变化在一定程度上反映出ENSO的信号。研究结果也指明ENSO对华北夏季降水的影响具有阶段性,在20世纪70-80年代之间的反相关件聿芷强.
The high frequency of occurrence of the drought in the North China during recent decades has impacted on the agriculture production. It is of importance to select the predictor affecting the North China summer rainfall (Jun-Aug) . The objective of this study is to propose the principal component analysis (PCA) regression forecasting model and to predict the variable characteristics of North China summer rainfall during 1951--2001. It is found that the regression equation, which is established from the 70 predictors of the first 2 PCAs of geopotential height, sea surface temperature and sea level pressure (SLP) fields, reflects the variation of the April--May SLP in association with the following summer rainfall variation in North China. To a certain degree, the SLP variation indicates the ENSO signal. Furthermore, the impact of ENSO on the North China summer rainfall is not persistent, the anticorrelation is higher during 1970s-1980s.
出处
《气候与环境研究》
CSCD
北大核心
2006年第3期296-301,共6页
Climatic and Environmental Research
基金
中国科学院知识创新工程重要方向项目KZCX3-SW-218
国家重点基础研究发展规划项目2004CB418300
2006CB400500
国家自然科学基金委青年项目40305012
关键词
华北
夏季降水
主分量
逐步回归预报模型
North China, summer rainfall, principal component analysis, stepwise-regression forecasting model