The Dependence of ITCZ Structure on Model Resolution and Dynamical Core in Aquaplanet Simulations
The Dependence of ITCZ Structure on Model Resolution and Dynamical Core in Aquaplanet Simulations
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DOI：
10.1175/jcli-d-13-00269.1
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发表时间：
2014-03
影响因子：
4.9
通讯作者：
K. Landu;L. Leung;S. Hagos;V. Vinoj;S. Rauscher;T. Ringler;M. Taylor
中科院分区：
文献类型：
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作者：
K. Landu;L. Leung;S. Hagos;V. Vinoj;S. Rauscher;T. Ringler;M. Taylor
摘要利用社区大气模式第4版（CAM4）、跨尺度大气预报模式（MPAS-A）和高阶方法模拟环境（HOMME）动力学核心以及纬向对称海表温度（SST）结构对水行星进行了模拟研究，以了解热带辐合带（ITCZ）结构对分辨率和动力学核心的依赖性。虽然HOMME和低分辨率MPAS-A模拟的所有分辨率都给出了纬向平均降水的单一赤道峰值，但高分辨率MPAS-A模拟给出了双ITCZ，降水峰值在赤道两侧约2°-3°。研究表明，对流与大尺度环流的相互反馈作用决定了ITCZ的结构。结果表明，HOMME和MPAS-A的比湿差异通过影响凝结潜热释放，导致对流有效位能（CAPE）的纬向分布不同。
AbstractAquaplanet simulations using the Community Atmosphere Model, version 4 (CAM4), with the Model for Prediction Across Scales–Atmosphere (MPAS-A) and High-Order Method Modeling Environment (HOMME) dynamical cores and using zonally symmetric sea surface temperature (SST) structure are studied to understand the dependence of the intertropical convergence zone (ITCZ) structure on resolution and dynamical core. While all resolutions in HOMME and the low-resolution MPAS-A simulations give a single equatorial peak in zonal mean precipitation, the high-resolution MPAS-A simulations give a double ITCZ with precipitation peaking around 2°–3° on either side of the equator. This study reveals that the structure of ITCZ is dependent on the feedbacks between convection and large-scale circulation. It is shown that the difference in specific humidity between HOMME and MPAS-A can lead to different latitudinal distributions of the convective available potential energy (CAPE) by influencing latent heat release by clo...