| 引用本文： |
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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].大英文模板1,2014,(6):221-228. [点击复制]
- WANG Na, WANG Qi, FANG Feng, CAI Xin-ling, XIAO Ke-li, FANG Jian-gang.Characteristics of spatial and temporal variation of extreme no rain days in each season in Shaanxi province[J].大英文模板1,2014,(6):221-228. [点击复制]
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| 摘要: |
| 利用陕西省78个地面气象站1961—2010年的逐日降水资料，统计了四季最大连续无降水日数，采用正交函数分解、Mann-Kendall趋势检验等方法，分析了各季节极端无降水日数的空间结构和时间演变规律。结果表明：极端无雨日数最多出现在冬季，为16～45 d，最少是夏季，为8～14 d；冬、春季节的高值中心出现在陕北北部、关中的东部，冬季陕北北部达43 d以上，夏季高值中心出现在关中的东部，为11～13 d；冬、春旱陕北最多，关中次之，陕南较少，夏、秋旱关中最多，陕北次之，陕南较少；在大尺度天气系统控制下，四季极端无降水日数事件的步调基本一致，不同季节的天气系统对陕西各区域的影响具有明显的局地性和阶段性；近50 a来夏季和秋季表现为持续增多趋势，冬季和春季有部分站点呈现出反向变化趋势，其中夏季和秋季陕北局部、陕南局部干期日数增多趋势显著。 |
| 关键词: 极端雨日数 时空分布特征 陕西省 |
| DOI： |
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| 基金项目:陕西省气象局重点科研项目(2011Z-7,2013Z-6) |
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| Characteristics of spatial and temporal variation of extreme no rain days in each season in Shaanxi province |
| WANG Na1, WANG Qi1, FANG Feng2, CAI Xin-ling1, XIAO Ke-li3, FANG Jian-gang1 |
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| 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 maximum 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. |
| Key words: extreme no rain days characteristics of spatial and temporal variation Shaanxi province |
