Entropy-Based Investigation on the Precipitation Variability over the Hexi Corridor in China
Entropy-Based Investigation on the Precipitation Variability over the Hexi Corridor in China
复制标题
基于熵的中国河西走廊降水变化研究
DOI：
10.3390/e19120660
复制
发表时间：
2017-12-01
期刊：
影响因子：
2.7
通讯作者：
Liao, Dehai
中科院分区：
文献类型：
--
作者：
Cheng, Liang;Niu, Jun;Liao, Dehai
利用熵信息分析了河西走廊降水时间序列的时空变异特征。这些检查是在1961-2015年期间基于29个气象站的月度，季度和年度时间尺度上进行的。利用分配熵和强度熵分析了区域降水特征，包括月、年降水量的年内和年代际分布，以及年内和10年内降水日数。降水变率高的区域主要分布在河西走廊西部，降水量偏少，发生干旱的可能性较大。降水日数的变率从走廊的西部到东部逐渐减小。近10年来，在作物生长季降水量和降水强度方面，都发现了更高的变率。此外，还比较了基于熵的降水变率与农作物产量的相关性，发现河西走廊中游地区历史时期的农作物产量与降水强度紊乱指数存在相关性。
The spatial and temporal variability of precipitation time series were investigated for the Hexi Corridor, in Northwest China, by analyzing the entropy information. The examinations were performed on monthly, seasonal, and annual timescales based on 29 meteorological stations for the period of 1961–2015. The apportionment entropy and intensity entropy were used to analyze the regional precipitation characteristics, including the intra-annual and decadal distribution of monthly and annual precipitation amounts, as well as the number of precipitation days within a year and a decade. The regions with high precipitation variability are found in the western part of the Hexi corridor and with less precipitation, and may have a high possibility of drought occurrence. The variability of the number of precipitation days decreased from the west to the east of the corridor. Higher variability, in terms of both of precipitation amount and intensity during crop-growing season, has been found in the recent decade. In addition, the correlation between entropy-based precipitation variability and the crop yield is also compared, and the crop yield in historical periods is found to be correlated with the precipitation intensity disorder index in the middle reaches of the Hexi corridor.