Contributions of the atmosphere–land and ocean–sea ice model components to the tropical Atlantic SST bias in CESM1
Contributions of the atmosphere–land and ocean–sea ice model components to the tropical Atlantic SST bias in CESM1
复制标题
大气-陆地和海洋-海冰模型成分对CESM1中热带大西洋海温偏差的贡献
DOI：
10.1016/j.ocemod.2015.09.008
复制
发表时间：
2015
期刊：
影响因子：
3.2
通讯作者：
F. Qiao
中科院分区：
文献类型：
--
作者：
Zhenya Song;Sang‐Ki Lee;Chunzai Wang;B. Kirtman;F. Qiao
为了识别和量化社区地球系统模型版本1（CESM1）的大气-陆地和海洋-海冰模型组成部分的内在误差及其对CESM1中热带大西洋海面温度（SST）偏差的贡献，我们提出了一种新的诊断方法并将其应用于一组CESM1模拟。我们对模型模拟的分析表明，CESM1 的大气-陆地和海洋-海冰模型组件在热带大西洋都存在较大误差。当两个模型组件完全耦合时，两个组件的固有误差在一年内迅速显现，且其增长率具有很强的季节性。特别是，海洋-海冰模型对北夏初夏赤道东部大西洋温暖的海温偏差有显着贡献。进一步的分析表明，在CESM1的独立海洋-海冰模拟中，在观测到的表面通量场的作用下，赤道东部大西洋表面混合层下方的上温跃层水过于温暖，这表明与上温跃层水夹带相关的混合层冷却在北半球初夏太弱。因此，尽管我们承认赤道大西洋西部的西风偏向和热带大西洋东南部的低层层云偏向的潜在重要性，这两者都源于大气-陆地模型，但我们在此强调，仅解决大气-陆地模型中的这些问题并不能解决CESM1中的赤道大西洋暖偏向。
In order to identify and quantify intrinsic errors in the atmosphere–land and ocean–sea ice model components of the Community Earth System Model version 1 (CESM1) and their contributions to the tropical Atlantic sea surface temperature (SST) bias in CESM1, we propose a new method of diagnosis and apply it to a set of CESM1 simulations. Our analyses of the model simulations indicate that both the atmosphere–land and ocean–sea ice model components of CESM1 contain large errors in the tropical Atlantic. When the two model components are fully coupled, the intrinsic errors in the two components emerge quickly within a year with strong seasonality in their growth rates. In particular, the ocean–sea ice model contributes significantly in forcing the eastern equatorial Atlantic warm SST bias in early boreal summer. Further analysis shows that the upper thermocline water underneath the eastern equatorial Atlantic surface mixed layer is too warm in a stand-alone ocean–sea ice simulation of CESM1 forced with observed surface flux fields, suggesting that the mixed layer cooling associated with the entrainment of upper thermocline water is too weak in early boreal summer. Therefore, although we acknowledge the potential importance of the westerly wind bias in the western equatorial Atlantic and the low-level stratus cloud bias in the southeastern tropical Atlantic, both of which originate from the atmosphere–land model, we emphasize here that solving those problems in the atmosphere–land model alone does not resolve the equatorial Atlantic warm bias in CESM1.
CMIP5 十年后报中热带大西洋南部暖海温误差的发展
影响因子：
4.6
作者：
Toniazzo T
通讯作者：
Toniazzo T