The daily precipitation data of 97 meteorological stations in Hunan Province for 34 years (1980-2013) have been used in this study to analyze the spatio-temporal distribution of precipitation in Hunan, combined with Kriging interpolation, and the spatial distribution characteristics of precipitation change trend in the province by linear regression method. The results show that (1) the spatial variation of annual precipitation roughly decreases progressively from the east and south to the west and north in Hunan, and the precipitation abundant zone is like the "人" shape beginning at the northern end of the Xuefeng Mountain and extending along the Mufu Mountain, Jiuling Mountain, Luoxiao Mountain and Nanling Range. (2) The annual precipitation distributes mainly in spring and summer, and the spring precipitation concentrates in the southeast of Hunan, while the summer precipitation occurs more in the northeast of Hunan. The precipitation is generally less in autumn and winter. And (3) the annual precipitation in Hunan shows a downward trend in general, and the precipitation in the four seasons is decreasing except for summer. The precipitation shows an increasing trend in the northwest part of Hunan and Dongting Lake plain in spring, increases significantly in the southeast of Hunan and some areas in central Hunan in summer, and has decreased in other areas. In autumn and winter, the precipitation is of a downward trend in most areas of Hunan.%利用湖南省97个气象台观测站点34 a(1980～2013年)的逐日降水量数据,结合克里金插值法分析湖南省降水量时空分布,并通过线性回归法计算气候倾向率研究湖南省降水量变化趋势的空间分布特征.结果表明:(1)年均降水量空间变化大致为东部、南部向西部、北部呈半环状递减,降水量丰富带呈"人"字形,始于雪峰山北端,沿幕阜山、九岭山、罗霄山、南岭伸展;(2)年内降水主要分布在春季和夏季,春季降水集中在湘东南,而夏季集中在湘东北.秋季和冬季降水量普遍较少;(3)湖南省年降水量总体上呈下降趋势,四季中除夏季以外降水量均为下降的趋势.春季湘西北地区和洞庭湖平原呈增加趋势,夏季湘东南以及湘中部分地区降水增加显著,其他地区为降水减少区.而秋季和冬季大部分地区均为下降趋势.
展开▼
