干旱气象 ›› 2020, Vol. 38 ›› Issue (4): 601-611.

• 论文 • 上一篇    下一篇

中国西南地区地表感热和潜热通量时空变化特征

黄珊1,3, 杨扬2,王含嘉1,杨启东1   

  1. (1.云南大学地球科学学院大气科学系,云南昆明650504; 2.中国气象局兰州干旱气象研究所,甘肃兰州730020;
    3.内蒙古自治区赤峰市阿鲁科尔沁旗气象台,内蒙古阿鲁科尔沁旗025550)

  • 出版日期:2020-08-31 发布日期:2020-09-04
  • 通讯作者: 杨扬(1988— ),女,助理研究员,主要从事陆气相互作用研究. E-mail: yangmeng07.happy@163.com。
  • 作者简介:黄珊(1998— ), 女, 学士,内蒙古赤峰人,主要从事陆气相互作用研究.
  • 基金资助:
    国家自然科学基金项目(41305103)资助

Spatio-temporal Characteristics of Sensible and Latent Heat Flux in Southwest China

HUANG Shan1,3, YANG Yang2, WANG Hanjia1, YANG Qidong1

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  1. (1. Department of Atmosphere Science, School of Earth Sciences, Yunnan University, Kunming 650500, China;
    2. Institute of Arid Meteorology, CMA, Lanzhou 730020, China; 3. Arukeerqin Banner Meteorological Station,
     Chifeng City, Inner Mongolia Autonomous Region, Arukeerqin Banner 025550,  Huhhot, China)
  • Online:2020-08-31 Published:2020-09-04

摘要: 基于1979—2017年ERA再分析资料地表潜热和感热通量数据,采用经验正交函数(EOF)和功率谱方法对中国西南地区地表感热和潜热通量时空变化特征进行分析。结果表明:(1)中国西南地区,春季感热通量比夏季大;而潜热通量则是夏季大、春季小。春夏季感热通量在2000年以后有明显减弱;而春夏季的潜热通量从2000年以后显著增强。(2)春季感热通量主要存在3种模态空间型,表现为东西反向、全区一致和“-+”偶极子分布;夏季感热通量主要存在2种模态空间型,表现为空间分布一致型。相应的时间系数表征了夏季感热通量显著的年代际变化特征。春季潜热通量存在3种模态空间型,主要表现为全区一致、东西反向和由中心向外递减分布;夏季潜热通量主要存在2种模态空间型,主要表现为全区一致型和由西北向东南呈梯形逐步增强的趋势。相应的时间系数表征了潜热通量显著的年际和年代际变化特征。(3)春夏季感热通量主要有3 a左右的年际变化和10 a以上的年代际变化特征,且年代际变化信号强于年际变化信号。春夏季潜热通量主要存在10 a以上的年代际变化特征。


关键词: 关键词:西南地区, 陆气相互作用, EOF, 感热和潜热通量

Abstract: Based on ERA reanalysis data during 1979-2017, the spatial-temporal variation characteristics of surface sensible and latent heat flux in Southwest China were analyzed by using empirical orthogonal function (EOF) and power spectrum methods. The results are as follows: (1) In Southwest China, the sensible heat flux in spring was larger than that in summer, while latent heat flux was larger in summer than in spring. The sensible heat flux in spring and summer began to weaken after 2000, while the latent heat flux in spring and summer had increased significantly since 2000. (2) There were three spatial patterns of sensible heat flux in spring, which were mainly characterized by east-west reverse, region-wide uniform and negative and positive dipole spatial distribution. There were mainly two spatial patterns in summer, which showed the consistency of spatial distribution. The corresponding time coefficients characterized the significant inter-decadal and inter-annual periodic variations of sensible heat fluxes in summer. There were three spatial patterns of latent heat flux in spring, which were mainly characterized by uniform region-wide, reverse east-west and decreasing outward in all directions from the center. There were mainly two spatial patterns of latent heat flux in summer. The first mode characterized the consistency in spatial distribution. The second mode indicated that the flux increased gradually from northwest to southeast in a trapezoidal manner. The change of corresponding time coefficients characterized that latent heat flux in spring and summer had significant inter-annual and inter-decadal variation characteristics. The sensible heat fluxes in spring and summer were characterized by inter-annual variations about 3 years and inter-decadal variations more than 10 years, and inter-decadal variations were stronger than inter-annual variations. The latent heat flux in spring and summer mainly had inter-decadal variations over 10 years in Southwest China.



Key words: southwest region, land-atmosphere interaction, EOF analysis, surface sensible and latent heat flux

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