Description and basic evaluation of simulated mean state, internal variability, and climate sensitivity in MIROC6
Description and basic evaluation of simulated mean state, internal variability, and climate sensitivity in MIROC6
复制标题
DOI：
10.5194/gmd-12-2727-2019
复制
发表时间：
2019-07-08
影响因子：
5.1
通讯作者：
Kimoto, Masahide
中科院分区：
文献类型：
--
作者：
Tatebe, Hiroaki;Ogura, Tomoo;Kimoto, Masahide
气候跨学科研究模型(MIROC)的第六版，称为MIROC6，是由一个日本建模社区合作开发的。本文对MIROC6中模拟的平均气候、内部气候变率和气候敏感性进行了评估和简要总结，并与我们以前版本的气候模式(MIROC5)和观测结果进行了比较。结果表明，MIROC6的平均气候和内部气候变率的总体重现性好于MIROC5。热带气候系统(如西太平洋夏季降水和向东传播的Madden-Julian振荡)和中纬度大气环流(如西风、极地夜间急流和对流层-平流层相互作用)在MIROC6中得到显著改善。这些改进可以归因于新实施的浅对流过程的参数化和平流层的纳入。虽然这两个模式在气候和气候变化方面存在显著差异，但2.6K的有效气候敏感度保持不变，因为辐射强迫和气候反馈的差异往往相互抵消。为了促进耦合模式相互比较项目的第六阶段，目前正在使用MIROC6进行指定的模拟，以处理广泛的气候科学问题，以及季节到年代气候预测和未来气候预测。
The sixth version of the Model for Interdisciplinary Research on Climate (MIROC), called MIROC6, was cooperatively developed by a Japanese modeling community. In the present paper, simulated mean climate, internal climate variability, and climate sensitivity in MIROC6 are evaluated and briefly summarized in comparison with the previous version of our climate model (MIROC5) and observations. The results show that the overall reproducibility of mean climate and internal climate variability in MIROC6 is better than that in MIROC5. The tropical climate systems (e.g., summertime precipitation in the western Pacific and the eastward-propagating Madden-Julian oscillation) and the midlatitude atmospheric circulation (e.g., the westerlies, the polar night jet, and troposphere-stratosphere interactions) are significantly improved in MIROC6. These improvements can be attributed to the newly implemented parameterization for shallow convective processes and to the inclusion of the stratosphere. While there are significant differences in climates and variabilities between the two models, the effective climate sensitivity of 2.6K remains the same because the differences in radiative forcing and climate feedback tend to offset each other. With an aim towards contributing to the sixth phase of the Coupled Model Intercomparison Project, designated simulations tackling a wide range of climate science issues, as well as seasonal to decadal climate predictions and future climate projections, are currently ongoing using MIROC6.