摘要
基于历史记录资料和国家气象信息中心气象资料重建了1938-2014年陇东黄土塬区日降水序列。通过WMO推荐的11个极端降水指标研究了近77年以来陇东黄土塬区极端降水变化的特征。结果表明:11938-2014年陇东黄土塬区降水微弱增加(0.07mm/10a),经历了明显减少(1938-1955)——微弱减少(1956-1993)——显著增加(1994-2014)3个阶段的变化。25个降水量指数整体呈减少趋势,其中强降水量(R95)减少最显著。3降水日数指数中CWD、R10、R20呈增加趋势,CDD与R50为减少趋势。4降水强度指数呈微弱减少趋势。但不同阶段各指数变化差异较大,对陇东黄土塬区极端降水贡献存在差异。探索极端降水变化对水土流失成因的分析有重要意义。
Based on the historical records and data from the National Meteorological Information Center,this paper reconstructs a precipitation sequence in Longdong Loess Plateau from 1938- 2014 and studies the index variation characteristics of extreme precipitation in Longdong Loess Plateau in the past 77 years according to the eleven extreme precipitation index issued by World Meteorological Organization. The results are as follows: 1). Precipitation variation in Longdong Loess Plateau experienced three stages from1938 to 2014. On the whole,there is a weak increasing trend; 2). There is a decreasing trend in the five precipitation index,and the most significant decrease exists in heavy precipitation( R95); 3).There is an increasing trend in the average daily precipitation R10,R20 and CWD,while CDD and R50 are in a decreased trend; 4). There is a weak increasing trend in precipitation intensity index. The differences of each index were significant in different stages which have different contribution to extreme precipitation in Longdong Loess Plateau. The results can provide reference for water conservancy project,water and soil conservation,and disaster prevention and reduction as well.
出处
《陇东学院学报》
2016年第3期87-91,共5页
Journal of Longdong University
基金
国家自然基金地区项目(31460090)
甘肃省科技支撑项目(144fkcm070)
陇东学院青年科技创新项目(XYSK1501)
关键词
陇东黄土塬区
董志塬
极端降水指数
气候变化
Longdong Loess Plateau
Dongzhi Plateau
precipitation extreme index
climate change
