J4 ›› 2005, Vol. 23 ›› Issue (3): 17-21.

• 论文 • 上一篇    下一篇

中国黄土高原地区春寒时空演变

王毅荣1,2张强1李耀辉1   

  1. 1.中国气象局兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,甘肃兰州780020
    2.甘肃省定西市i气象局,甘肃定西748000
  • 收稿日期:2005-07-05 修回日期:2005-08-24 出版日期:2005-09-30 发布日期:2005-09-30
  • 作者简介:王毅荣(1967-) ,男,甘肃定西市人,高级工程师,主要从事天气动力、气候变化和计算机软件工程研究.E一mail; werice@163, com
  • 基金资助:

    国家自然基金项目(40205014),甘肃省科学技术攻关计划项目( ZUS042 - A44 - 017 ),干旱气象科学研究基金项目 (IAM200508)共同资助

The Evolvement of Spring Cold Weather Intensity in Chinese Loess Plateau

WAND Yi一ron1,2ZHANU Qiang1,LI Ya。一hui1   

  1. (1. Kcy Laboratory of Arid Climate Change and Reducing Disaster of Uansu Province, Lanzhou Institute of Arid Meteorology,
        CMA, Lanzhou 730020, China;2.  Dingxi Meteorological Bureau of Uansu Provinec,Dingxi 7通3000, Uansu, China)
  • Received:2005-07-05 Revised:2005-08-24 Online:2005-09-30 Published:2005-09-30

摘要:

利用1961~2000年春季日均气温资料,采用EOFs小波分析和分维分析等方法,研究了该区域春季春寒变化。结果表明,黄土高原地区春寒强度大致由北向南递减,又存在东西梯度。春寒强度线性递减率高原中部大于周边,3月、4月变化的线性趋势显v著,分别以0.3  C/10 a,1.7  C/10 a速度减少。春寒强度变化旱现较高的全区一致,高原大部分春寒强度明显减弱,高原腹地易出现强春寒。春寒强度变化存在周期振荡,3月以2~4 a周期为主,4月以3~4 a为主,5月存在2~4 和6a左右周期;1990s春寒强度最弱,最强时段在3,4,5各月分布不同;4月春寒强度演变在1980年附近发生了转折,下降明.显。分数维D由3月到5月逐渐增大,春寒强度变化复杂程度提高。春寒空间演变中大振幅区在高原腹地,振幅向四周衰减;变化信息,在西部存在东流的趋势,在高原东部存在回流趋势.

关键词: 中国黄土高原, 春寒, 时空, 演变

Abstract:

 based on the mean daily temperature data in spring from 1961 to 2000,using empirical orthogonal function complex empirical orthogonal  function(CE<)F),fractal dimension,and wavclet analysis methods,  the spatial and temporal
evolvement of spring cold weather intensity in Chinese loess plateau was analyzed in this paper.  Results show that the spring
cold weather intensity decreased approximately from north to south, and also there was a gradient from cast to west;the linear
decreasing rate of the spring cold weather intensity in the middle of the plateau was bigger than that in the peripheral,and the
changing tendency was remarkable in  March and  April;there was periodic oscillation of  the spring cold  weather intensity
change,which were about 2一}I a in March,3一} a in April,2一} a and 6 a in May, respectively. 'hhe spring cold weather in-
tensity was weakest in 1990x.   "hhe strongest period of spring cold weather in March,April and May, and the distribution was
different in each month.  "hhe spring cold weather intensity change in April had a transition in 1980,and then it decreased obvi-
ously. 'hhe fractal dimension increased gradually from March to May, the changing complex degree of the spring cold weather
intensity increased at the same time. "hhe big amplitude area of spring cold weather was in the center of the plateau. "hhe change
information flew to cast in the west and southwest in the cast of the plateau.

Key words: Chinese loess plateau, spring cold weather intensity, spatial and temporal characteristics, cvolvcmcnt

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