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CN 11-1768/O4

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基于多源陆面通量数据相融合的新资料及其在中国夏季风影响过渡区的应用研究
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1.河北省气候中心;2.兰州干旱气象研究所;3.北京市气象服务中心

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国家自然科学基金


Construction of a new dataset based on multi-source land surface flux data and its application in the boundary area of EASM
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    摘要:

    夏季风影响过渡区是陆面能量交换与区域气候相互作用显著的热点区域。然而目前缺乏适用于该区域的高精度长期通量数据集并限制了陆面水热交换与气候相互作用的研究。如何融合目前已有的多源通量资料进行重构建以及应用显得十分必要。本研究综合包括中国北方协同观测试验和中国通量网的多种下垫面通量观测以及多种格点资料试图重构中国夏季风影响过渡区陆面能量通量数据集。在筛选具有优良下垫面代表性站点并考察模拟和观测散点分布规律的基础上,利用多元回归模型构建了一套适用于夏季风影响过渡区并且受观测资料约束的月平均感热、潜热和净辐射数据集。交叉验证结果表明构建的数据集相对于几种原始格点数据集精度有一定提高,并最大程度消除了原始格点资料的系统偏差。进一步分析表明在地表能量平衡分量中,陆面湍流通量对夏季风的响应更为显著,并且夏季风影响过渡区陆面湍流热通量对夏季风持续时间呈现对数分布的年际变化规律,当夏季风处于低持续影响状态时陆面湍流热通量年际变化更为显著,偏弱的夏季风系统可能导致陆面过程对气候变化更强的影响。本文基于多源通量数据融合构建的新数据集可以为气候变化研究提供数据支撑,同时增加了对陆面过程与季风系统相互作用的认识。

    Abstract:

    The boundary area of the East Asian summer monsoon (EASM) is a hot spot area with intense interaction between land surface process and regional climate. However, the lack of high-quality long-term flux data sets available for this region limits the study of the interaction between land surface water and heat exchange and climate. It is necessary to reconstruct a new dataset based on currently available multiple flux data and then apply it in climate research. In this study, the data sets of land surface energy fluxes in the boundary area of EASM in China were reconstructed by integrating the field observations conducted over Northern China and several gridded datasets. Based on selection of sites with good underlying surface representative and investigation of the scattering distribution of simulations and observations, a set of monthly average sensible heat, latent heat and net radiation data sets are generated by using multiple regression model. The cross validation results show that the accuracy of the constructed data set is improved compared with several original gridded data sets, and the systematic deviation of the original lattice data is eliminated to the greatest extent. Further analysis suggests that among the surface energy balance components, the response of land surface turbulent flux to summer monsoon is more significant, and the interannual variation of land surface turbulent heat flux in the boundary area of EASM shows logarithmic distribution to the duration of summer monsoon. The turbulent heat fluxes present more significant interannual variations as the summer monsoon is in a low persistent state. Weaker summer monsoon system may lead to a stronger impact of land surface processes on climate change. The new data set based on multi-source flux data fusion can provide supports for climate change research, and increase the understanding of the interaction between land surface processes and monsoon climate.

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历史
  • 收稿日期:2019-07-26
  • 最后修改日期:2020-05-26
  • 录用日期:2020-06-11
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