A global eddying hindcast ocean simulation with OFES2
A global eddying hindcast ocean simulation with OFES2
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DOI：
10.5194/gmd-2019-351
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发表时间：
2020-02
影响因子：
5.1
通讯作者：
H. Sasaki;S. Kida;R. Furue;H. Aiki;Nobumasa Komori;Y. Masumoto;T. Miyama;M. Nonaka;Y. Sasai
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作者：
H. Sasaki;S. Kida;R. Furue;H. Aiki;Nobumasa Komori;Y. Masumoto;T. Miyama;M. Nonaka;Y. Sasai
抽象的。使用我们的新版本模型进行准全球涡流海洋后报模拟，称为 OFES2（地球模拟器第 2 版海洋环流模型），以克服其先前版本 OFES 中具有不切实际属性的几个问题。本文描述了 OFES2 中的模型和模拟海洋场，并与 OFES 和观测数据进行了比较。 OFES2 包括海冰模型和潮汐混合方案，由新创建的表面大气数据集 JRA55-do 驱动，模拟了 1958 年至 2016 年的海洋场。我们发现 OFES2 相对于 OFES 的一些改进：全球海面温度和海面盐度以及印度尼西亚和阿拉伯海的水团特性的偏差较小。 OFES2 中的 Niño3.4 和印度洋偶极子 (IOD) 指数的时间序列比 OFES 中的要好一些。与之前的版本不同，OFES2 在正 IOD 事件期间再现了更真实的异常低海面温度。厄尔尼诺和 IOD 事件改善的一个可能原因是大气数据集的更换。另一方面，一些问题仍然不切实际，例如黑潮和墨西哥湾流的路径以及咸地中海溢流的不切实际的扩散。鉴于先前版本的全球使用以及此处介绍的改进，OFES2 的输出将有助于研究广泛时空尺度的各种海洋现象。
Abstract. A quasi-global eddying ocean hindcast simulation using a new version of our model, called OFES2 (Ocean General Circulation Model for the Earth Simulator version 2), was conducted to overcome several issues with unrealistic properties in its previous version, OFES. This paper describes the model and the simulated oceanic fields in OFES2 compared with OFES and also observed data. OFES2 includes a sea-ice model and a tidal mixing scheme, is forced by a newly created surface atmospheric dataset called JRA55-do, and simulated the oceanic fields from 1958 to 2016. We found several improvements in OFES2 over OFES: smaller biases in the global sea surface temperature and sea surface salinity as well as the water mass properties in the Indonesian and Arabian seas. The time series of the Niño3.4 and Indian Ocean Dipole (IOD) indexes are somewhat better in OFES2 than in OFES. Unlike the previous version, OFES2 reproduces more realistic anomalously low sea surface temperatures during a positive IOD event. One possible cause of these improvements in El Niño and IOD events is the replacement of the atmospheric dataset. On the other hand, several issues remained unrealistic, such as the pathways of the Kuroshio and Gulf Stream and the unrealistic spreading of salty Mediterranean overflow. Given the worldwide use of the previous version and the improvements presented here, the output from OFES2 will be useful in studying various oceanic phenomena with broad spatiotemporal scales.