Relationship between shortwave radiation bias over the Southern Ocean and the double-intertropical convergence zone problem in MRI-ESM2,Atmospheric Science Letters

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Relationship between shortwave radiation bias over the Southern Ocean and the double-intertropical convergence zone problem in MRI-ESM2
Atmospheric Science Letters ( IF 2.0 ) Pub Date : 2021-07-17 , DOI: 10.1002/asl.1064
Hideaki Kawai ₁ , Tsuyoshi Koshiro ₁ , Seiji Yukimoto ₁

Affiliation

The relationship between improvements in the radiation bias over the Southern Ocean and the alleviation of the double-intertropical convergence zone (ITCZ) problem in the actual updates of our climate models is investigated. The radiation bias in MRI-CGCM3 that was used for CMIP5 simulations, particularly over the Southern Ocean, is significantly reduced in MRI-ESM2 that is used for CMIP6 simulations. Each modification that contributed to the reduction of the radiation bias was progressively reverted to the corresponding older treatment in order to examine their individual impacts on the ITCZ representation. Results show the double-ITCZ problem worsens almost monotonically when the excessive shortwave insolation over the Southern Ocean increases. The contribution of the atmosphere is about one third of the impact on the total northward energy transport and the corresponding response of the Hadley cell is related to the change in the double-ITCZ. However, our results also imply that the ITCZ bias cannot be completely resolved by the improvements of radiative flux alone and that there are other causes of the problem.

中文翻译：

南大洋短波辐射偏差与MRI-ESM2双热带辐合带问题的关系

在我们的气候模型的实际更新中，研究了南大洋辐射偏差的改善与双热带辐合带（ITCZ）问题的缓解之间的关系。用于 CMIP5 模拟的 MRI-CGCM3 中的辐射偏差，特别是在南大洋，在用于 CMIP6 模拟的 MRI-ESM2 中显着降低。每个有助于减少辐射偏差的修改都逐渐恢复到相应的旧处理，以检查它们对 ITCZ 表示的个别影响。结果表明，当南大洋过度短波日照增加时，双 ITCZ 问题几乎单调恶化。大气的贡献约占总向北能量传输影响的三分之一，而哈德利环流的相应响应与双 ITCZ 的变化有关。然而，我们的结果也意味着 ITCZ 偏差不能完全通过辐射通量的改善来完全解决，而且还有其他问题的原因。

更新日期：2021-07-17

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