摘要
利用陕西省气象观测站气温和降水资料、干旱灾害记述资料,根据年旱涝等级、降水距平百分率以及CI干旱指数的分布与变化,分析比较了冷期1965—1966年干旱和暖期1994—1995年干旱的范围、程度以及干旱过程演变的异同。结果表明,冷暖背景下均会出现连续的干旱,当暖期与降水减少相遇时,出现的干旱更为严重;处于干旱半干旱区的陕北,干旱过程往往持续时间较长,处于半湿润区和湿润区的关中、陕南,干旱时段内往往会出现多个干旱过程。陕北1994—1995年的干旱天数少于1965—1966年,而关中、陕南1994—1995年的干旱天数多于1965—1966年,同一干旱事件在各地会呈现出不同的特点。
On the background of climate change, the meteorological disaster change has got wide attention. Based on temperature and the precipitation data from weather stations in Shaanxi Province, this paper analyses the similarities and differences of two drought events, of which one occurred in 1960s when it was relatively cold climate, and the other occurred in 1990s when it was relative lous percentage as well as CI drought period or warm climate period. When ly cold climate, according to the drough index. The results show that continuous drought occurrs in warm climate period, t waterlogging rank, precipitation anoma- drought may occur in either cold climate it will be more serious. The duration of a drought event is often longer in northern Shaanxi which is in semiarid region, while a drought event usually includes sev- eral drought processes in the central and southern parts of the province which are in subhumid and humid region. The days of drought occurred in 1994--1995 are less than those in 1965--1966 in northern Shaanxi. But in the central and southern parts of the province, the days of drought occurred in 1994--1995 are more than those in 1965--1966. Drought occurred in ddifferent areas show different characteristics.
出处
《干旱地区农业研究》
CSCD
北大核心
2012年第1期238-245,共8页
Agricultural Research in the Arid Areas
基金
中国气象局气候变化专项"西北极端干旱事件个例库及干旱指标数据集"(CCSF-09-14[0])
关键词
干旱事件
冷期
暖期
drought event
cold period
warm period
