摘要
文中利用东北地区208个国家气象站1961-2014年逐日气温和降水量资料,根据气象干旱综合监测指数(MCI)计算公式,并且依据当前气象干旱等级国家标准对干旱过程及干旱强度进行定义。分析东北地区近54年来发生干旱过程的时空特征。结果表明:春季是东北地区干旱发生的主要季节;东北平原地区干旱严重;而辽宁东部和吉林南部受干旱影响最小。近54年来,东北地区发生干旱过程的年际强度变化上与干旱的范围年际变化特征基本吻合。通过REOF的时空分析,将东北地区大致分成三个区域模态:辽河平原模态,大兴安岭中部模态及三江平原模态,并且各模态中干旱强度随时间变化趋势不同。
In this research,the drought process and its intensity were defined by using the daily temperature and precipitation data of 208 national weather stations in northeast China from 1961 to 2014,according to the comprehensive monitoring index of meteorological drought calculation formula and the classification of meteorological drought. The spatial and temporal characteristics of the drought process in the past 54 years in Northeast China were analyzed. The results show that the spring was the main drought season in Northeast China,the drought was serious in Northeast China and the drought was the least in eastern Liaoning and southern Jilin. In the last 54 years,the interannual variability of the drought process in Northeast China was consistent with the interannual variability of the whole drought region. Based on the temporal and spatial analysis of REOF,the northeastern region wass divided into three regional modes： the Liaohe plain mode,the middle of Great Khingan mode and the Sanjiang plain mode.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2017年第10期118-124,共7页
Journal of Arid Land Resources and Environment
关键词
东北地区
气象干旱综合监测指数(MCI)
时空特征
Northeast China
comprehensive monitoring index of meteorological drought index （MCI）
temporal and spatial distribution characteristics
