摘要
利用云南大理州12个气象站1961—2010年气温、日照、风速、蒸发量等观测资料,运用彭曼—蒙蒂斯公式计算大理州潜在蒸散量及湿润度指数,并对大理州潜在蒸散量的时空分布特征进行分析,对干旱情况进行评价。结果表明,大理州潜在蒸散量东部大,南部次之,北部最小。月潜在蒸散量5月最大,12月最小,1—5月递增,5—12月递减。1994—2010的平均潜在蒸散量明显大于1961—1993年。大理州潜在蒸散量与降水量、水汽压、气温、净辐射呈显著正相关关系,与风速没有明显的相关关系。正常年份大理州11月至次年5月都存在不同程度的干旱。
Based on the 1961-2010 conventional observation data from 12 meteorological stations in Dali, the potential evapo-transpiration in Dali was calculated by using Penman-Monteith Method to analyze the spatial and temporal distribution features. The results show that the potential evapotranspiration presents the largest value in eastern Dali, and the smallest value in northern area. The potential evapotranspiration is maximum in May and minimum in December. The average value of potential evapo-transpiration from 1994 to 2010 is larger than that from 1961 to 1993. The potential evapotranspiration is positively related to precipitation, vapor pressure, air temperature and net radiation,but not related with wind speed. In addition, different degrees of drought often occur during November to the next May in Dali.
出处
《气象与减灾研究》
2013年第4期55-59,共5页
Meteorology and Disaster Reduction Research
关键词
潜在蒸散量
彭曼—蒙蒂斯公式
时空分布
湿润度指数.
Dali
Potential evapotranspiration
Penman-Monteith method
Drought monitoring
Relative moisture index
