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甘肃黄土高原水热气候异常阶段特征

郭林1,2张凯王毅荣雷俊
  

  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,中国气象局干旱气候变化与减灾重点开放实验室,甘肃 兰州 7300202. 2.甘肃省定西市气象局,甘肃 定西 743000
  • 收稿日期:2011-11-04 出版日期:2013-07-10 发布日期:2013-01-18
  • 作者简介:郭林(1966 - ),男,甘肃定西人,工程师,主要从事应用气象研究. E - mail:guolin52996@ 126. com
  • 基金资助:

    国家公益性行业(气象)科研专项(GYHY201106029)、甘肃省自然科学基金项目(3ZS061 - A25 - 009)、干旱气象科学研究基金项目(IAM201206)共同资助
      

Analysis of Abnormality of Water and Heat Resources in Gansu Loess Plateau

GUO Lin1,2,ZHANG Kai1,WANG Yirong2,LEI Jun2   

  1. 1. Key Laboratory of Arid Climatic Changing and Reducing Disaster of Gansu Province,Key Open Laboratory of Arid Climate Change and Disaster Reduction of CMA,Institute of Arid Meteorology,China Meteorological Administration,Lanzhou730020,China; 2. Dingxi Meteorological Bureau of Gansu Province,Dingxi 743000,China
  • Received:2011-11-04 Online:2013-07-10 Published:2013-01-18

摘要:

利用1960 ~2004 年相关地面实测气象资料,分析甘肃黄土高原地区水热气候异常变化的阶段性特征。结果表明,该地区地表变暖最为突出,夏半年增幅明显大于冬半年,地温随深度加深增温幅度越大;降水日数减少,连阴雨天气时段缩短、过程雨量减少,无雨时段增长,日照出现2 次突变、呈现下降趋势;降水日数在1991 年后突变减少,最长连续降水日数及过程降水量在1978 年后突变减少。

关键词: 黄土高原, 水热气候异常, 突变, 周期, 阶段性

Abstract:

Based on surface meterological data from 34 weather stations in Gansu during 1960 - 2004,the abnormal variation of water and heat resources on the Gansu loess plateau was analyzed by using weighted average,wavelet analysis and EOF ( empirical orthogonal function) . Results show that the ground temperature increased obviously after 1983,the increasing amplitude in summer was more than that in winter,and the increasing amplitude of groud temperature was bigger with depth deepening. The rainfall days decreased obviously after 1991,the length of successive raining days shortened and no rain days extended,the longest continuous rainfall days and procession precipitation decreased after 1978. The sunshine hours also presented decreasing trend.

Key words: loess plateau, abnormal climate, abrupt change, periods, phase

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