【作者】 王纪军； 裴铁璠； 苏爱芳； 孔海疆；

【Author】 Wang Ji-jun1,2 Pei Tie-fan1 Su Ai-fang2 Kong Hai-jiang2 (1Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;2Nanjing University of Science and Technology; 3Meteorological Observatory of Henan Province, Zhengzhou 450003, China)

【机构】 中国科学院沈阳应用生态研究所； 河南省气象台；

【摘要】 利用河南省49个台站1957～2003年逐月的降水资料,运用降水集中度和集中期分别讨论了河南省降水时空分布特征和变化规律,同时对多水年和少水年的集中度进行了比较。结果表明:降水集中度和集中期能够定量地表征降水量在时空场上的非均一性,降水集中度平均为0.489,集中期为7.083月。降水集中度的EOF分析显示取前6个特征之对应的特征向量可解释80%以上的方差。第一气候模态表现为全省一致性,而第二气候模态表征为南北的反相。多水年的降水集中度明显比少水年的偏大,且多水年的降水集中度分布较少水年简单,基本为带状分布。更多还原

【Abstract】 Provided with monthly precipitation data from 1957 to 2003 on 49 stations in Henan Province, based on the precipitation concentration degree (PCD) and precipitation concentration period (PCP), the characteristics of the spatial and temporal distribution and variation of the precipitation were analyzed. subsequently, the principal component analysis of the normalized anomaly fields of the PCD has been performed. in the end ,we analyze the feature and the difference of the corresponding period of the more and less precipitation amount. The results show that precipitation in Henan Province distributed evenly among the months, while precipitation in 78.7% stations from May to September exceed 60%, so the text consider the flood season as period from May to September. It is obvious that precipitation during flood season is zonal distributed. It is proved that the PCD and PCP can display the temporal heterogeneity in the precipitation field. The mean of PCD in all stations is 0.489, whereas, the difference between years is bigger, and it is clear that the time series have periodic change. The PCD in flood season is 0.295, while the precipitation centralized between flood season and year is not synchronous. The mean of PCP is 7.083 month, the values vary small among stations. The EOF of normalized anomaly fields of the PCD shows that the six EOF modes can depict the spatial distribution. The EOF1 exhibits all the stations inphase, which center lies in Ru’nan and Baofeng, and the EOF1 can explain the 51.95% of the variance. The EOF2 takes on seesaw between the south and north. The synthetic analysis of more and less precipitation showed that PCD in years with more precipitation is larger obviously than that of less precipitation. The PCD in 70% stations is between 0.5 and 0.6 in years with more precipitation, while the PCD in 79% stations is below 0.5 in years with less precipitation. The space distribution of PCD in more precipitation year is more complex than that of in less precipitation, for the former is zonal, while the latter is near zonal.更多还原