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Construction and characteristic analysis of background error covariance coupled with land surface temperature

Qihang Yang Yaodeng Chen Luyao Qin Yuanbing Wang Deming Meng Xusheng Yan Xinyao Qian

大气和海洋科学快报（英文版）2025，Vol.18Issue(3)：7-12,6.
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大气和海洋科学快报（英文版）2025，Vol.18Issue(3)：7-12,6.DOI:10.1016/j.aosl.2024.100512

Construction and characteristic analysis of background error covariance coupled with land surface temperature

Construction and characteristic analysis of background error covariance coupled with land surface temperature

Qihang Yang 1Yaodeng Chen 1Luyao Qin 2Yuanbing Wang 1Deming Meng 3Xusheng Yan 1Xinyao Qian1

作者信息

  • 1. Key Laboratory of Meteorological Disaster,Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Nanjing University of Information Science & Technology,Nanjing,China
  • 2. College of Meteorology and Oceanography,National University of Defense Technology,Changsha,China
  • 3. Key Laboratory of Mesoscale Severe Weather,Ministry of Education,School of Atmospheric Sciences,Nanjing University,Nanjing,China
  • 折叠

摘要

Abstract

地表温度(LST)是涉及陆气相互作用的关键变量,对天气气候预报具有重要影响.不过在同化中实现LST与大气的协调分析却并不容易.这是因为目前对跨陆气圈层的背景误差协方差(BEC)的了解较少.本文旨在探究LST与大气的背景误差是否存在联系,以及这种联系是否存在时空变化.为此,本研究构建了耦合大气变量和LST的BEC,并基于2023年梅雨季分析了其特征.总体特征表明:LST误差主要与大气温度相关;随着大气高度的上升,误差相关性逐渐减小;LST误差的标准差明显大于低层大气温度."多雨日"和"少雨日"的时空特征表明,LST与低层大气温湿度误差的相关性及标准差均与天气背景密切相关,且具有明显的昼夜变化.上述结果可为后续陆气强耦合同化提供参考.

关键词

背景误差协方差/地表温度/误差相关性/误差标准差/资料同化

Key words

Background error covariance/Land surface temperature/Error correlation/Error standard deviation/Data assimilation

引用本文复制引用

Qihang Yang,Yaodeng Chen,Luyao Qin,Yuanbing Wang,Deming Meng,Xusheng Yan,Xinyao Qian..Construction and characteristic analysis of background error covariance coupled with land surface temperature[J].大气和海洋科学快报（英文版）,2025,18(3):7-12,6.

基金项目

This work was sponsored by the National Natural Science Foundation of China[grant number U2442218]. （）

大气和海洋科学快报（英文版）

1674-2834

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