CAS-ESM2 模式反映的热带西太平洋海温偏差诱发的双 ITCZ 来源

IF 6 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Jinning Tong, Fei Zheng, Jiangbo Jin, Ruowen Yang, Jiang Zhu, Qingcun Zeng
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引用次数: 0

摘要

"双ITCZ "是当前气候模式和地球系统模式中热带太平洋上空常见的降水偏差,但其形成原因仍值得探讨。本研究采用中国科学院地球系统模式(CAS-ESM2)第二版,通过比较一组热带太平洋海面温度(SST)偏差校正实验,从耦合模式气候年平均偏差的角度探讨了SST偏差诱发 "双ITCZ "的可能机制。结果表明,热带太平洋模拟的气候年平均 SST 偏差可通过饱和比湿影响潜热通量的偏差,而潜热通量的偏差又可通过凝结释放机制进一步影响湿空气垂直速度的偏差,并最终调节降水的模拟偏差。此外,通过不同试验之间的相互比较,发现双ITCZ的来源可能主要来自热带西太平洋上空的年平均SST偏差,通过提出的 "SST-饱和比湿-潜热通量-垂直速度-降水 "的海气耦合过程,为减少热带太平洋上空模式的耦合偏差,提高CAS-ESM2的气候模拟精度提供了可能的途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The source of Double ITCZ induced by the SST bias over the tropical western Pacific as reflected in CAS-ESM2 Model

“Double ITCZ” is a common precipitation bias over the tropical Pacific in current climate models and Earth system models, but the reasons for its formation are still worth exploring and discussing. In this study, we adopted the second version of Chinese Academy of Sciences Earth System Model (CAS-ESM2), by comparing a set of sea surface temperature (SST) bias correction experiments over the tropical Pacific, to explore the possible mechanism of SST bias on inducing the “Double ITCZ” from the perspective of the climatic annual mean bias in the coupled model. We revealed that the simulated climatic annual mean SST bias over the tropical Pacific can affect the bias of latent heat flux through the saturation specific humidity, and the bias of latent heat flux can further affect that of vertical velocity of humid air by the condensation release mechanism, and finally modulate the simulated bias in precipitation. Furthermore, through the inter-comparison between different experiments, it is found that the source of Double ITCZ might mainly come from the annual mean SST bias over the tropical western Pacific through the proposed air-sea coupled process of “SST-saturated specific humidity-latent heat flux-vertical velocity-precipitation”, indicating a possible way on reducing the couple biases in models over the tropical Pacific to improve the accuracy of CAS-ESM2 for climate simulation.

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来源期刊
Science China Earth Sciences
Science China Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
9.60
自引率
5.30%
发文量
135
审稿时长
3-8 weeks
期刊介绍: Science China Earth Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research.
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