东北地区气温和日照区划

THE CLIMATIC REGIONALIZATION OF AIR TEMPERATURE AND SUNSHINE IN NORTHEASTERN CHINA

根据对气温和日照的主成分分析,明确了东北地区多年气温偏差和多年日照时间偏差的优势分布型,然后用气温和日照的各主成分同各个站点的气温和日照间的时间变动特性值(因子负荷量),由群平均法求出聚类间的类似度(或称距离),以此作为分区的综合指标,作成东北地区气温和日照区划图。

This article analyzed the principal components of air temperature and sunshine, the two major climatic elements, and defined the dominant distribution patterns of secular temperature deviation (Fig.g) and sunshine-hour deviation (Fig.4) . Furthermore, the group average method was used to obtain the similarity (or distance, Fig. 5) among the clusters with the factor loading (Tab.3) that are related to the rise and fall of the dominant distribution patterns. It was regarded as the indexes of the regionalization to make the cluster analysis (Fig.6). Finally, the climatic regionalization (Fig.7) of air temperature and sunshine with time change in Northeast China was completed.It is a new method of the climatic regionalization combining the principal component analysis with the cluster analysis. It overcomes the short comings of subjectivity and nonunity of the regionalization indexes in traditional re-gionalizations. Meanwhile the article also indicated that the quantitative clima tic regionalization should be applied combining with the special climatic map (or available climatic map) . We should promote the advantages and overcome the shortages in order to provide reliable scientific basis for arranging the agricultural production structure to suit the local conditions.