自然资源学报 ›› 2016, Vol. 31 ›› Issue (2): 343-353.doi: 10.11849/zrzyxb.20141350

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“雅安天漏”降水变化气候特征的分析

周秋雪1, 2, 3, 李跃清1, *, 蒋兴文1, 张静1, 4   

  1. 1. 中国气象局成都高原气象研究所,成都 610072;
    2. 四川省气象台,成都 610072;
    3. 高原与盆地暴雨旱涝灾害四川省重点实验室,成都 610072;
    4. 中国民航飞行学院新津分院,四川 新津 611431
  • 收稿日期:2014-10-15 出版日期:2016-02-25 发布日期:2016-02-25
  • 通讯作者: 李跃清(1960- ),男,研究员,主要从事高原气象、灾害性天气气候预测和气候变化研究。E-mail:yueqingli@163.com
  • 作者简介:周秋雪(1986- ),女,四川自贡人,工程师,硕士,主要从事高原东侧地区天气与气候研究。E-mail:1013456@sina.com
  • 基金资助:
    国家重点基础研究发展计划项目(2012CB417202); 国家公益性行业(气象)科研专项经费项目(GYHY201006053,GYHY201106003); 西南区域气象中心重大业务项目(2010-1); 西南区域强降水预报创新团队; 西南区域重大业务项目(2014-3); 四川省气象局科学技术研究开发课题(川气课题2015-青年-03)

Analysis on the Climatic Characteristics of the Precipitation Variations at “Ya'an Sky-leakage”

ZHOU Qiu-xue1, 2, 3, LI Yue-qing1, JIANG Xing-wen1, ZHANG Jing1, 4   

  1. 1. Institute of Plateau Meteorology, China Meteorological Administration, Chengdu 610072, China;
    2. Sichuan Provincial Meteorological Observatory, Chengdu 610072, China;
    3. Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072, China;
    4. Xinjin Flight College, Civil Aviation Flight University of China, Xinjin 611431, China
  • Received:2014-10-15 Online:2016-02-25 Published:2016-02-25
  • Supported by:
    National Key Basic Research Program of China, No.2012CB417202; National Public Welfare Industry (Meteorological) Special Funds Scientific Research Program of China, No.GYHY201006053 and GYHY201106003; Major Business Program of Southwest Regional Meteorological Center, No.2010-1; Heavy Rain Forecast Innovation Team of Southwest Regional; Major Business Program of Southwest Region, No.2014-3; Science and Technology Research and Development Project of Sichuan Provincial Meteorological Bureau, No.2015-Youth-03

摘要: 论文基于1951—2008年逐日降水资料和1969—2000年逐小时降水资料,应用统计诊断分析方法,研究了青藏高原东侧雅安降水量、降水频率的多时间尺度变化特征。结果表明:与整个四川省的降水变化一致,近58 a“雅安天漏”的年降水总量和年雨日是减少的,并且后者比前者减少得更加显著;降水量在20世纪90年代的显著减少是雨日和雨强变化共同影响的结果;除冬季外,春、夏、秋三季的降水量和雨日均呈减小趋势,其中秋季减少最明显;汛期降水量减少占年降水量减少量的92.7%,汛期雨日的减少比降水量显著,占年雨日减少的62.9%;21世纪初期后,“雅安天漏”强降水月份减少,雨日集中时段缩短;“雅安天漏”夜雨特征突出,夜间降水量和频次远远大于白天,呈单峰单谷结构,降水谷值到峰值增加速率是峰值到谷值衰减速率的2倍,易夜间形成强降水,具有明显持续性。进一步分析发现,雅安不仅夜雨量和发生频次减小,而且降水表现为峰值出现时间提前、向前半夜移动的变化特征。

Abstract: Based on the daily precipitation data during 1951-2008 and hourly precipitation data during 1969-2000 at Ya'an station, multiple time scale variations of precipitation amount and precipitation frequency at “Ya'an sky-leakage” which locates at the eastern edge of the Tibetan Plateau are investigated. The result of conventional statistical diagnostic method shows that the annual precipitation and annual rain days are reducing during the last 58 years at “Ya'an sky-leakage”, and the decrease of rain days is more obvious than that of precipitation. Particularly, the annual precipitation sharply declined after the 1990s due to the decreased of both rain days and rainfall intensity. Except in winter, the trends of precipitation in other three seasons are all downward. Among all seasons, the reductions of precipitation and rain days in autumn are the most obvious. The precipitation reduction in flood season accounts for 92.7% of the annual precipitation reduction. The decrease of rain days in flood season is more obvious than that of precipitation, which account for 62.9% of the annual rain days' reduction. After the beginning of the 21st century, the strong precipitation months decreased, and the aggregated period of rain days shortened significantly. The night rainfall is the most prominent characteristic at “Ya'an sky-leakage”. Both the amount and frequency of rainfall in the night are much more than in the daytime. There is a peak of the rainfall in the night, and the increase rate from valley to peak is twice as much as the decrease rate from peak to valley, so it is easy to form heavy rain at night, and it is obviously lasting. However, further analysis found that not only the amount and frequency of night rainfall reduced at “Ya'an sky-leakage”, but also the precipitation peak occurred earlier than before.

中图分类号: 

  • P467