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冰川冻土 ›› 2021, Vol. 43 ›› Issue (4): 1179-1189.doi: 10.7522/j.issn.1000-0240.2018.1151

• 冰冻圈水文与水资源 • 上一篇    下一篇

1960—2017年河西地区降水时空变化特征

王秀娜1,2(), 丁永建1,2,3(), 王建4, 赵传成5   

  1. 1.中国科学院 西北生态环境资源研究院 内陆河流域生态水文重点实验室,甘肃 兰州 730000
    2.中国科学院大学,北京 100049
    3.中国科学院 西北生态环境资源研究院 冰冻圈科学国家重点实验室,甘肃 兰州 730000
    4.盐城师范学院 城市与规划学院,江苏 盐城 224002
    5.兰州城市学院 地理与环境工程学院,甘肃 兰州 730070
  • 收稿日期:2018-09-20 修回日期:2018-12-24 出版日期:2021-08-31 发布日期:2021-09-09
  • 通讯作者: 丁永建 E-mail:wangxiuna@lzb.ac.cn;dyj@lzb.ac.cn
  • 作者简介:王秀娜,博士研究生,主要从事气候变化、遥感及GIS应用研究. E-mail: wangxiuna@lzb.ac.cn
  • 基金资助:
    国家自然科学基金项目(41730751)

Spatio-temporal variation characteristics of precipitation in the Hexi region during 19602017

Xiuna WANG1,2(), Yongjian DING1,2,3(), Jian WANG4, Chuancheng ZHAO5   

  1. 1.Key Laboratory of Ecohydrology of Inland River Basin,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
    3.State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    4.School of Urban and Planning,Yancheng Teachers University,Yancheng 224002,Jiangsu,China
    5.Department of Geography and Environmental Engineering,Lanzhou City University,Lanzhou 730070,China
  • Received:2018-09-20 Revised:2018-12-24 Online:2021-08-31 Published:2021-09-09
  • Contact: Yongjian DING E-mail:wangxiuna@lzb.ac.cn;dyj@lzb.ac.cn

摘要:

利用1960—2017年日降水量资料,采用线性倾向趋势分析、滑动分析和泰森多边形法等,对河西地区多年降水时空变化特征及不同量级降水日数及降水强度的变化趋势进行了研究。结果表明:河西地区年均降水量为99.0 mm,呈现明显的逐年上升趋势,平均倾向率为8.72 mm?(10a)-1,月降水量为单峰分布,5—10月夏秋汛期降水量占年降水量的89.2%,各季节降水量均呈现显著上升趋势;年均降水日数为36.7天,呈现明显的上升趋势,增幅为3.18 d?(10a)-1,降水日数主要分布在夏季,约占总降水日数的54.6%;平均降水强度为2.70 mm?d-1,呈现减弱趋势,变化速率为-0.04 mm?d-1?(10a)-1;零星小雨和小雨降水日数均呈现增加趋势,而二者平均降水强度均为下降趋势,小到中雨降水日数和降水强度呈现增加趋势,中雨及以上的降水变化趋势不明显。

关键词: 河西地区, 降水, 降水日数, 降水强度, 时空变化, 趋势分析

Abstract:

Based on the daily precipitation data of 18 meteorological stations in the Hexi region from 1960 to 2017, linear trend analysis, sliding average and Thiessen polygon method were employed to analyze the spatial and temporal precipitation variability and the variation trend of rainy days and precipitation intensity at different precipitation magnitudes. Results show that the average annual rainfall in the Hexi region is 99.0 mm?a-1 and represents a decreasing trend from southeast to northwest. The average annual rainfall showed an increasing trend with the interannual variation rate of 8.72 mm?(10a)-1. The annual distribution of precipitation presents a unimodal character and shows a distinct seasonal distribution, with more than 89.2% of annual rainfall occurred in summer and autumn. The average number of annual rainy days in the Hexi region is 36.7 days, showing a significant increasing trend, with the interannual variation rate of 3.18 d?(10a)-1. The rainy days are mainly concentrated in summer and represent a decreasing trend from southeast to northwest. The average precipitation intensity in the Hexi region is 2.70 mm?d-1, showing a decreasing trend, with the interannual variation rate of -0.04 mm?d-1?(10a)-1. The precipitation days of sporadic light rain, light rain and light to moderate rain showed an increasing trend, with growth rates of 1.70 d?(10a)-1, 1.13 d?(10a)-1 and 0.16 d?(10a)-1, respectively. The average precipitation intensity of sporadic light rain and light rain showed a decreasing trend, with the rates of -0.02 mm?d-1?(100a)-1 and -0.21 mm?d-1?(100a)-1, but the average precipitation intensity of light to moderate rain showed an increasing trend, with the rate of 0.07 mm?d-1?(100a)-1. There are fewer precipitation events in moderate rains and above, and most stations are less than one time in a year, thus the long-term trend is not obvious.

Key words: Hexi region, precipitation, rainy days, precipitation intensity, spatio-temporal variation, trend analysis

中图分类号: 

  • P426.61