Reproducibility of Equatorial Kelvin Waves in a Superparameterized MIROC: 1. Implementation and Verification of Blockwise‐Coupled SP‐MIROC

Yamazaki, K.; Miura, H.

doi:10.1029/2023ms003836

Cited by 1 publication

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References 102 publications

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“…This expansion made it possible to compare simulated EKWs in terms of not only their statistical features but also their physical mechanisms. We used the fields simulated in the standard MIROC6 (Tatebe et al, 2019) and its SP version (SP-MIROC) described in our companion paper (Yamazaki & Miura, 2024a, Part 1 hereafter), as well as observational data sets, as the basic states for the linear analyses. Thus, this study serves not only to develop a theoretical framework of the CCEKW, but also to investigate the EKW enhancement in SP-MIROC introduced in Part 1.…”

Section: Introductionmentioning

confidence: 99%

Reproducibility of Equatorial Kelvin Waves in a Super‐Parameterized MIROC: 2. Linear Stability Analysis of In‐Model Kelvin Waves

Yamazaki,

Miura

2024

J Adv Model Earth Syst

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While low‐resolution climate models at present struggle to appropriately simulate convectively coupled large‐scale atmospheric disturbances such as equatorial Kelvin waves (EKWs), superparameterization helps better reproduce such phenomena. To evaluate such model differences based on physical mechanisms, a linearized theoretical framework of convectively coupled EKWs was developed in a form readily applicable to model evaluation by allowing background stability and diabatic heating to have arbitrary vertical profiles rather than assuming simplified ones. A system of linearized equations of convection‐coupled gravity waves was derived as a two‐dimensional model of the convectively coupled EKWs. In this work, the basic states are taken from observations, CTL‐MIROC and SP‐MIROC experiments introduced in Part 1. The tendency of convectively coupled gravity waves to grow faster under top‐heavy heating is confirmed for realistic stratification profiles, as found in previous studies under constant stratifications. A comparison of linear unstable solutions with basic states taken from SP‐MIROC and CTL‐MIROC shows that the top‐heavy heating profile in SP‐MIROC largely contributes to the enhancement of the EKW‐like unstable modes, while subtle differences of stratification profiles considerably affect EKW behaviors. The bottom‐heavy heating bias in the CTL‐MIROC likely originates from insufficient modeling of subgrid stratiform precipitation in tropical organized systems. It is desirable to incorporate such stratiform components in cumulus parameterizations to achieve better EKW reproducibility.

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Section: Introductionmentioning

confidence: 99%