论文部分内容阅读
以三峡库区(重庆段)为研究区,利用17个气象站点的实测降水量分别在年、季、月尺度上验证TRMM(Tropical rainfall measurement mission)卫星降水数据的精度,并基于TRMM降水数据分析了研究区的降水时空分布特征。结果表明:①TRMM降水与站点实测数据存在显著的线性相关性,数据在该研究区具有较好的实用性。年尺度上,拟合优度R2=0.79,通过a=0.01置信度检验,相关系数R=0.89;季尺度上,各季节都通过a=0.01置信度检验,春季拟合优度相对较低(R2=0.62);月尺度上,拟合优度R2=0.71,通过a=0.01置信度检验,相关系数为0.84。②降水空间分布整体上呈由西南向东北逐渐递增的趋势,高值区分布在东北部区域,低值区分布在西南部区域,中值区分布在中部、南部以及西部的山脊边缘区域。③降水差异显著,夏季最多,冬季最少;大部分降水集中在5~8月,占全年降水的60%左右,12月到第二年2月降水仅占全年的5%左右。
Taking the Three Gorges reservoir area (Chongqing section) as study area, the accuracy of satellite precipitation data of TRMM (Tropical rainfall measurement mission) was verified by using the measured precipitation at 17 meteorological stations respectively. Based on the analysis of TRMM precipitation data The spatial and temporal distribution of precipitation in the study area. The results show that: (1) there is a significant linear correlation between TRMM precipitation and measured data in the station, and the data has good practicability in this study area. On the annual scale, the goodness of fit R2 = 0.79, through a = 0.01 confidence test, the correlation coefficient R = 0.89. On the seasonal scale, all the seasons passed the a = 0.01 confidence test, and the spring goodness of fit was relatively low R2 = 0.62). On the monthly scale, the goodness of fit R2 = 0.71, which passed the confidence test of a = 0.01, the correlation coefficient was 0.84. ② The spatial distribution of precipitation generally shows a gradual increase from southwest to northeast. The high value area is located in the northeast area, the low value area is located in the southwestern area, and the median area is located in the central, southern and western ridge areas. ③ There were significant differences in precipitation between summer and summer, with the least in winter. Most of the precipitation was concentrated in May-August, accounting for about 60% of the annual precipitation. Precipitation in February and December only accounted for about 5% of the whole year.