Improved Climate Simulation by MIROC5. Mean States, Variability, and Climate Sensitivity
Improved Climate Simulation by MIROC5. Mean States, Variability, and Climate Sensitivity
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DOI：
10.1175/2010jcli3679.1
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发表时间：
2010-12-01
影响因子：
4.9
通讯作者：
Kimoto, Masahide
中科院分区：
文献类型：
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作者：
Watanabe, Masahiro;Suzuki, Tatsuo;Kimoto, Masahide
由日本研究界合作开发的大气-海洋环流模式的一个新版本，称为气候跨学科研究模式（MIROC），最近已经开发完成。使用新版本（MIROC 5）进行了长达世纪的控制试验。用T85大气模式和1度海洋模式的标准分辨率，然后将气候平均状态和变率与观察和以前版本中的观察（MIROC 3 2）具有两种不同的分辨率（medres hires）比MIROC 5A的分辨率更粗更细MIROC 5的平均场在某些方面与MIROC 3 2相似或稍差，但在其他方面气候特征明显优于MIROC 3 2。厄尔尼诺现象的模拟-南方涛动MIROC 5与前两个模式的差异大于两个MIROC 3 - 2版本之间的差异，表明参数化方案的更新对模式气候的影响大于模式分辨率的提高。MIROC 5中复杂预报方案得到的平均云特征与卫星观测结果吻合较好，MIROC 5揭示了一种平衡状态。气候敏感性为2.6K，比MIROC3.2低1 K，这可能是由于低云对CO_2浓度增加的负反馈作用，而MIROC3.2则相反
A new version of the atmosphere ocean general circulation model cooperatively produced by the Japanese research community known as the Model for Interdisciplinary Research on Climate (MIROC) has recently been developed A century long control experiment was performed using the new version (MIROC5) with the standard resolution of the T85 atmosphere and 1 degrees ocean models The climatological mean state and variability are then compared with observations and those in a previous version (MIROC3 2) with two different resolutions (medres hires) coarser and finer than the resolution of MIROC5A few aspects of the mean fields in MIROC5 are similar to or slightly worse than MIROC3 2 but otherwise the climatological features are considerably better In particular improvements are found in precipitation zonal mean atmospheric fields equatorial ocean subsurface fields and the simulation of El Nino-Southern Oscillation The difference between MIROC5 and the previous model is larger than that between the two MIROC3 2 versions indicating a greater effect of updating parameterization schemes on the model climate than increasing the model resolution The mean cloud property obtained from the sophisticated prognostic schemes in MIROC5 shows good agreement with satellite measurements MIROC5 reveals an equilibrium climate sensitivity of 2 6 K which is lower than that in MIROC3 2 by 1 K This is probably due to the negative feedback of low clouds to the increasing concentration of CO2 which is opposite to that in MIROC3 2