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中国沙漠 ›› 2023, Vol. 43 ›› Issue (5): 139-154.DOI: 10.7522/j.issn.1000-694X.2023.00033

• • 上一篇    下一篇

夏季风影响过渡区陆面蒸散发对夏季风活跃度的响应

李宏宇1,2(), 张强2, 岳平2, 曾剑3(), 郭晓楠1   

  1. 1.河北地质大学 河北省农业干旱遥感监测国际联合研究中心/土地科学与空间规划学院,河北 石家庄 050031
    2.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 730020
    3.成都信息工程大学 大气科学学院 高原大气与环境四川省重点实验室,四川 成都 610225
  • 收稿日期:2023-01-11 修回日期:2023-04-12 出版日期:2023-09-20 发布日期:2023-09-27
  • 通讯作者: 曾剑
  • 作者简介:曾剑(E-mail: zengjian@cuit.edu.cn
    李宏宇(1987—),男,河北衡水人,博士研究生,主要从事陆面过程和生态遥感研究。E-mail: aridlhy@qq.com
  • 基金资助:
    国家自然科学基金项目(42230611);河北省自然科学基金项目(D2022403013);干旱气象科学研究基金项目(IAM202202);河北地质大学科技创新团队项目(KJCXTD-2021-10)

Response of surface evapotranspiration to the East Asian summer monsoon over the summer monsoon transition zone of China

Hongyu Li1,2(), Qiang Zhang2, Ping Yue2, Jian Zeng3(), Xiaonan Guo1   

  1. 1.Hebei International Joint Research Center for Remote Sensing of Agricultural Drought Monitoring / School of Land Science and Space Planning,Hebei GEO University,Shijiazhuang 050031,China
    2.Gansu Key Laboratory of Arid Climatic Change and Reducing Disaster / CMA Key Open Laboratory of Arid Climatic Change and Disaster Reduction,Institute of Arid Meteorology,China Meteorological Administration,Lanzhou 730020,China
    3.Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,College of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,China
  • Received:2023-01-11 Revised:2023-04-12 Online:2023-09-20 Published:2023-09-27
  • Contact: Jian Zeng

摘要:

在东亚夏季风影响过渡区,陆面蒸散发(Evapotranspiration,ET)时空变化对夏季风活动响应规律的研究对理解陆地水热循环过程至关重要。本研究利用夏季风过渡区及邻近区域14个陆面观测站点的蒸散发观测数据评估了6种常用蒸散发全球产品的适用性,并对它们在过渡区的年际变化进行了比较。评估表明,JRA-55(Japanese 55-Year Reanalysis)可以较好模拟站点尺度的蒸散发,而且能够合理刻画过渡区平均蒸散发的长期年际变化,因此将JRA-55作为蒸散发参考数据集。在理解过渡区蒸散发时空变化的基础上,考察了陆面蒸散发对夏季风活动的响应特征。为识别东亚夏季风在影响过渡区的活跃度和活动规律,引入夏季风持续时间,该指数较常用的夏季风强度指标能更合理地反映过渡区夏季降水和夏季风活动的年际变化特征。本研究发现陆面蒸散发在年际时间尺度上与夏季风持续时间的散点呈现近似对数/幂函数曲线。在弱夏季风年,蒸散发年际变化对夏季风持续时间更为敏感。对蒸散发和夏季风持续时间进行集合经验模态分解,结果显示出夏季风活动在3年、年代际和长期趋势上显著影响蒸散发。未来气候情景下,东亚夏季风系统的活跃度很可能将增强,这会加速陆面蒸散发等水循环过程,同时对流域水资源和生态系统的稳定性将会产生重大影响。

关键词: 夏季风, 过渡区, 蒸散发, 模拟能力, 持续时间

Abstract:

Exploring the response of evapotranspiration (ET) spatio-temporal pattern to the East Asian summer monsoon (EASM) is important to understand the terrestrial hydrological cycle. The paper focuses on the summer monsoon transition zone (SMTZ) in China where the climate is rather sensitive to summer monsoon activity, and analyzed the response of ET in the SMTZ to EASM activity. The study evaluated six global ET products widely used based on ET observation data collected from fourteen sites over Northern China,and then conducted a comparison of them in interannual variations of ET over SMTZ. Results indicate that JRA-55(Japanese 55-Year Reanalysis) can simulate ET at the site scale well, and reasonably depict the long-term interannual variation of the average ET over the SMTZ. Therefore, JRA-55 is used as the reference ET data set in this study. The summer monsoon activity is identified over the SMTZ by adopting a monsoon temporal duration index (MTDI) which is related with interannual variations of summer rainfall more closely than commonly used summer monsoon intensity indexes. This study found an obviously unlinear response of evapotranspiration to MTDI and the evapotranspiration exhibits approximately logarithmic/power function curve with the MTDI. High interannual variability of evapotranspiration was observed due to high sensitivity to MTDI during weak EASM years. The result from ensemble empirical mode decomposition further indicates that the summer monsoon activity significantly affects the evapotranspiration variation on three-year, interdecadal and long-term scales. The summer monsoon activity is expected to strengthen in the future, which is very likely to intensify the water cycle and affect the availability of water resources and the ecosystem stability over the SMTZ.

Key words: summer monsoon, transition zone, evapotranspiration, simulation ability, temporal duration

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