北京大学学报(自然科学版)

• 北京大学学报 •

基于EEMD的中国地区1956?2005年日照变化的趋势分析

李慧群,付遵涛   

  1. 北京大学物理学院大气与海洋科学系, 气候与海气实验室, 北京 100871;
  • 收稿日期:2011-04-26 出版日期:2012-05-20 发布日期:2012-05-20

Sunshine Duration’s Trend Behavior Based on EEMD over China in 1956-2005

LI Huiqun, FU Zuntao   

  1. Department of Atmospheric and Oceanic Sciences and Laboratory for Climate and Ocean-Atmosphere Studies, School of Physics, Peking University, Beijing 100871;
  • Received:2011-04-26 Online:2012-05-20 Published:2012-05-20

摘要: 根据国家气象信息中心给出的逐日日照时数资料, 利用集合经验模态分解(ensemble empirical mode decomposition, EEMD)方法, 得到中国地区日照时数的非线性趋势变化特征。对各气象台站日照时数的非线性变化趋势类型做了分类以及分区域和季节研究, 并与线性趋势进行对比。结果表明: 近50年来中国地区绝大部分气象台站(占总气象台站数的67.5%)日照时数呈现下降的趋势, 尤其是在中国南部和东北地区, 呈现明显的区域特征和季节特征。日照时数的年代际变化整体上在1980年前后出现气候转型, 即呈现前期日照较长、后期较短的气候形态。

关键词: 日照时数, 集合经验模态分解(EEMD), 非线性趋势, 多年代趋势

Abstract: The daily sunshine duration data in 1956?2005 from national meteorological information center are used to analyze the sunshine duration’s nonlinear trend behavior over China by the method of ensemble empirical mode decomposition (EEMD). The sunshine duration exhibits different nonlinear trends over different regions and in different seasons, most of them (over nearly 67.5% stations) show a descending trend, especially over the south and northeast China. The multi-decadal variability appears a climate shift in 1980s with the longer sunshine in the earlier stage and the shorter in the late part.

Key words: sunshine duration, EEMD, nonlinear trend, multi-decadal trend

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