摘要
采用朝阳地区1953-2011年,59a的日降水量、小型蒸发日总量、日照日总量等气象数据,计算了各区域的Palmer干旱指数与降水距平百分率,并对计算结果进行了分析与对比。实验结果表明:降水距平百分率法可直观反映降水偏离平均水平的程度,但对旱情反应灵敏度较低;Palmer干旱指数对朝阳地区干旱强度的描述更准确,该方法综合考虑了降水量、温度、地表蒸腾等多方面因素,更适合朝阳地区易干燥、实际蒸发较大地区干旱特征的分析。
The results were analyzed and compared after calculating the Palmer Drought Severity Index （PDSI） and the precipitation anomaly percentage in different areas in Chaoyang according to 59 years of daily precipitation, daily amount of small evaporation, sunshine and other meteorological data from1953 to 2011. It shows that the precipitation anomaly percentage method can directly re- flect the precipitation from the average level, but the drought sensitivity is low. Palmer Drought Severity Index can describe the drought intensity in Chaoyang Area more accurately, and the method is more suitable for analyzing characteristics in Chaoyang, be- cause it has considered the precipitation, temperature, surface transpiration and other factors.
出处
《中国农村水利水电》
北大核心
2013年第9期76-79,共4页
China Rural Water and Hydropower
基金
国家级公益性行业(农业)科研专项(201303125)
辽宁省自然科学基金项目(2013020059)
辽宁省教育厅一般项目(L2013265)
关键词
Palmer指数
降水距平百分率
干旱特征
palmer index
precipitation anomaly percentage
drought characteristics
