【摘要】 利用宁夏地区19个测站近50年降水量资料,确定了干旱年、分析其干旱的特征及其演变,在此基础上,探讨了干旱灾害的原因,采用交叉谱分析方法,得到了ENSO事件以及太阳活动等外强迫因子对宁夏地区干旱的影响尺度、幅度及响应时间,以说明干旱气候变化与这些因素的相关程度。更多还原

【Abstract】 Annual precipitation data of nearly 50 years collected by meteorological station in Ningxia wereused to study drought year,drought features and its change.Furthermore,the causes of drought were analyzed and the outer factors such as ENSO and solar activities influencing on the drought scale, extent and responding time were studied also by using cross spectrum.更多还原