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冰川冻土 ›› 2001, Vol. 23 ›› Issue (1): 16-21.

• 研究论文 • 上一篇    下一篇

黄河源区降水与径流过程对ENSO事件的响应特征

王根绪1,2, 沈永平1, 刘时银1   

  1. 1. 中国科学院寒区旱区环境与工程研究所, 甘肃兰州730000;
    2. 兰州大学资源环境学院, 甘肃兰州730000
  • 收稿日期:2000-05-28 修回日期:2000-07-03 出版日期:2001-02-25 发布日期:2012-04-26
  • 基金资助:
    中国科学院寒区旱区环境与工程研究所知识创新工程项目(CACX210042);中国科学院“西部之光”支持项目;国家自然科学基金项目(49871021);中国科学院特别支持项目“冰冻圈动态变化基础研究(三)”资助

On the Characteristics of Response of Precipitation and Runoff to the ENSO Events in the Source Regions of the Yellow River

WANG Gen-xu1,2, SHEN Yong-ping1, LIU Shi-yin1   

  1. 1. Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou Gansu 730000, China;
    2. Resources and Environmental College of Lanzhou University, Lanzhou Gansu 730000, China
  • Received:2000-05-28 Revised:2000-07-03 Online:2001-02-25 Published:2012-04-26

摘要: 根据最新季分辨率ENSO指数序列所确认的近40多年来所发生的20次ENSO事件,并确定了每次ENSO事件强度及其影响年,通过对相应年份黄河源区降水与径流距平变化值的对比,分析了降水与径流过程对ENSO事件响应的统计规律:ENSO事件与黄河源区降水与径流年际波动变化有很好的相关性,这种相关性与ENSO事件的性质强弱、发生季节以及持续时间等有关,一般夏秋季暖事件无论强弱均使影响年降水减少,发生于春季的中等强度暖事件使发生年降水呈负距平,影响年降水呈增加趋势;冷事件与暖事件对降水的影响正好相反;暖事件对应年份黄河源区径流量减少,而冷事件则使其增加.随着20世纪90年代以来暖事件发生频率的增加,径流呈现持续减少.

关键词: ENSO事件, 黄河源区, 降水, 径流

Abstract: In the source regions of the Yellow River (above the Tangnag Section), runoff is mainly nourished by precipitation, accounting for 64 1% of the total. Owing to climate change, variation in precipitation would result in runoff change in the source regions. According to a new ENSO index, which has a seasonal resolving ability, 20 ENSO events are identified from the spring 1952 through the spring 1998. There are 13 warm phase events and 7 cold phase events recognized. The strength and influence duration of each ENSO event is confirmed. Comparing the precipitation and runoff changing processes with the relative ENSO events, a statistical responsive relationship of precipitation and runoff to ENSO events in the source regions of the Yellow River are worked out in this paper. It is found that the annual fluctuation of precipitation and runoff in the source regions are obviously interrelated to ENSO events. The interrelationship was associated to the features, strength, occurring season and duration of the event. Generally, a warm phase event occurring in the summer and autumn may decrease the precipitation in the influence duration no matter how the strength of the ENSO event is. A warm phase event with middle strength occurring in the spring season would decrease the precipitation in the occurring duration, but would increase the precipitation in the influence duration. On the contrary, the cold phase event may increase the precipitation in the source regions. A warm phase event would decrease the runoff in the source regions. On the contrary, a cold phase event can increase the runoff. Because the occurring rate of the warm phase event has increased since the 1990s, runoff has a decrease trend in the source regions of the Yellow River.

Key words: ENSO events, source regions of the Yellow River, precipitation, runoff, changing process

中图分类号: 

  • P339