第 3 3 卷第3 期
20 1 0 年6 月
大气科学学报
Transactions of Atmospheric Sciences
Vol. 33 No. 3
Jun.2010
周连童.欧亚大陆干旱半干旱区感热通量的时空变化特征[ ] . 大气科学学报,2010,33(3):299-306.
Zhou Lian-tong. Characteristics of temporal and spatial variations of sensible heat flux in the arid and semi-arid region of Eurasia[ J]. Trans Atmos Sci,
2010,33(3) :299-306.
欧亚大陆干旱半干旱区感热通量的时空变化特征
周连童
(中国科学院大气物理研究所季风系统研究中心’北 京 100190)
摘要:利用1958—20 0 2 年 E R A - 4 0 再分析感热通量资料进行E O F 分析,结果显示,无论春季还是夏
季,欧亚大陆干旱半干旱区感热通量都有3 个主模态。第 1 模态都表示空间分布的一致性,2 0 世
纪7 0 年代中后期开始,欧亚大陆干旱半干旱区春季感热通量明显增强,而夏季却明显减弱。第2 、
3 模态表示了空间分布的不一致性,且存在年际、年代际变化特征。小波分析结果表明,欧亚大陆
春、夏季感热通量存在明显的年际、年代际变化特征,且年代际变化信号强于年际变化信号。
关键词:E R A - 4 0 再分析资料;感热通量;E O F 分析;Morlet小波
中图分类号:P468 文献标识码:A 文章编号= 1674-7097(2010)03-0299-08
Characteristics of Temporal and Spatial Variations of Sensible Heat
Flux in the Arid and Semi-arid Region of Eurasia
Z H O U Lian-tong
(Center for Monsoon System Research,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100190,China)
Abstract:Based on the E R A -40 reanalysis data of sensible heat flux during 1958一2002,the character
istics of temporal and spatial variations of summer and spring sensible heat flux in Eurasia (including
Middle Asia, Mongolia and Northwest China) are analyzed by use of E O F and Morlet wavelets analysis
methods. The results show that there are three principal spatial patterns of sensible heat flux in the arid
and semi-arid region of Eurasia in spring or summer. The first pattern shows the space consistency of
sensible heat flux in the region of Eurasia,in which the sensible heat flux obviously increases in spring,
but markedly decreases in summer from the middle and late of 1970s. The second and third patterns
show spatial heterogeneity of sensible heat flux in the region of Eurasia with interannual and interdec-
adal variabilities. Besides,the Morlet wavelets results show that the sensible heat flux are dominated by
interannual and interdecadal variabilities in spring and summer, and the signal of interdecadal variability
is more significant than that of interannual variability.
Key words : ERA-40 reanalysis data; sensible heat flux; E O F analysis; Morlet wavelets
o 引言
2 0 世 纪 9 0 年 代 ,在 世 界 气 候 研 究 计 划
(W C R P )之下制定了全球能量和水分循环试验计划
(Global Energy and Water Cycle Experiment,简称
G E W E X ),全球能量和水分循环试验计划的主要任
务是观测、了解、模拟大气一陆地一海表的水分、热
量交换和循环及其对气候的影响。这个试验的实施
收稿日期=2009-11-24;改回日期=201043-25
基金项目:国家自然科学基金资助项目(40905027 ;40730952),中国科学院知识创新工程重要方向项目(KZCX 2-YW- 22 0) ;国家重点基础
研究发展规划项目(2009CB421405) ;中国科学院大气物理研究所青年人才领域前沿项目(IAP07414)
作者简介:周连童(1974— ),男 ,北京人,博士,副研究员,研究方向为气候年代际变化及其机理,lt@ mail. iap. ac. cn.