干旱地区农业研究Issue(6)：221-228,267,9.
陕西省极端无雨日数的时空分布特征
Characteristics of spatial and temporal variation of extreme no rain days in each season in Shaanxi province
摘要
Abstract
The spatial and temporal characteristics of extreme no rain days are analyzed using the daily precipitation data at 78 stations in Shaanxi Province from 1961—2010 .Using EOF ,Mann-Kendall trend test and others ,the maxi-mum continuous rainless days (daily rainfall less than 0 .1mm ) of each season are analyzed .The result shows that the most extreme no rain days have taken place in winter for 16~45 days ,while the least days in summer for 8~14 days . The high value center in winter and spring occurs in the north of northern Shaanxi and eastern Guanzhong ,of which the maximum lasts for over 43 days in north of northern Shaanxi in winter ,while the high value center in summer happens in eastern Guanzhong for 11 to 13 days .The drought in winter and spring occurs most frequently in northern Shaanxi ,less in Guanzhong ,least in southern Shaanxi .The drought in summer and autumn occurs most frequently in Guanzhong ,less in northern Shaanxi ,least in southern Shaanxi .Under the control of large-scale weather system ,the extreme no rain days of each season have the same frequency ,but the influence of the weather systems in different seasons on the sub-region is of significant localization and stage .In the past 50 years it is an increasing trend in summer and autumn ,while some sites show a reverse trend in winter and spring .There is a significantly increasing trend in summer and autumn in some places of northern Shaanxi and southern Shaanxi .关键词
极端无雨日数/时空分布特征/陕西省Key words
extreme no rain days/characteristics of spatial and temporal variation/Shaanxi province分类
农业科技引用本文复制引用
王娜,王琦,方锋,蔡新玲,肖科丽,方建刚..陕西省极端无雨日数的时空分布特征[J].干旱地区农业研究,2014,(6):221-228,267,9.基金项目
陕西省气象局重点科研项目 （）
