CMIP6模拟对中国气温年际变化的高估:积雪和云的作用

IF 3.4 2区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Liquan Wang, Zhaochen Liu, Dabang Jiang
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引用次数: 0

摘要

几十年来,气候模式高估了中国地表气温的年际变化。这个问题被广泛讨论,但没有一个明确的归属。利用最新的第六阶段耦合模式比对项目模式,我们研究了基于大气能量收支的相关物理过程对中国模拟温度变率的影响。结果表明:西北、西南、华北、华中和华东地区存在较强的高估,主要表现为积雪和云量的再现较差;夸大的积雪变率增强了晴空短波辐射反射回大气顶部的波动,在青藏高原、华北、华中和华东地区引起正偏置。这种积雪反照率反馈也解释了为什么高估的冬季和春季温度变率大于夏季和秋季。短波云辐射强迫也是华北和西北地区以及华中和华东30°N以南地区温度波动过高的原因。积雪反照率反馈和短波云辐射强迫的贡献随季节和地区的不同而不同。另外,对流层温度变率的高估导致了西北地区温度变率的高估。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Overestimation of Interannual Temperature Variability Over China by CMIP6 Simulations: The Role of Snow Cover and Cloud Representation

Climate models have overestimated the interannual variability in surface air temperature over China for decades. This issue has been widely discussed but without a clear attribution. Using the latest sixth phase of the Coupled Model Intercomparison Project models, we investigate the relevant physical processes contributing to the greater simulated temperature variability in China based on the atmospheric energy budget. The results show that a strong overestimation exists in Northwest, Southwest, North, Central, and East China, which is dominated by the poor reproduction of snow cover and cloud. Exaggerated snow cover variability enhances the fluctuations of the clear-sky shortwave radiation reflected back to the top-of-the-atmosphere, inducing positive biases in the Tibetan Plateau, North, Central, and East China. This snow-albedo feedback also explains why the overvalued temperature variability in winter and spring is larger than that in summer and autumn. The shortwave cloud radiative forcing is also responsible for the overvalued temperature fluctuations in North and Northwest China, as well as south of 30°N in Central and East China. The contributions of snow-albedo feedback and shortwave cloud radiative forcing vary with seasons and regions. Additionally, the overvalued tropospheric temperature variability leads to the temperature variability overestimation in Northwest China.

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来源期刊
Journal of Geophysical Research: Atmospheres
Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics
CiteScore
7.30
自引率
11.40%
发文量
684
期刊介绍: JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.
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