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LICOM3.0海洋模式中太平洋北赤道逆流的模拟偏差分析
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国家重点研发专项2016YFC1401401、2016YFC1401601,国家自然科学基金项目4191183、41576025、41776030


Simulation Bias Analysis of Pacific North Equatorial Countercurrent in LICOM3.0 Ocean Model
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    摘要:

    本文用CORE-IAF(Coordinated Ocean-ice Reference Experiments–Interannual Forcing)外强迫场分别强迫LICOM3(LASG/IAP Climate System Ocean Model Version 3)和POP2(Parallel Ocean Program version 2)两个海洋模式,并分析了这两个模式中太平洋北赤道逆流(NECC)的模拟结果。我们发现LICOM3和POP2模拟的NECC强度均弱于实测,这和Sun et al.(2019)的研究结果一致,也进一步证明了海洋模式中NECC偏弱是CORE-IAF外强迫场造成的,海表风应力及对应的风应力旋度是海洋模式准确模拟NECC的最主要因子。同时,我们也分析了NECC的模拟在动力机制上的差别,这里的动力强迫项包括风应力项、平流项和余项。我们发现模式的外强迫场虽然相同,但是两个模式中各动力强迫项(风应力项、平流项和余项)对NECC模拟的影响并不完全相同。

    Abstract:

    In this study, the CORE-IAF (Coordinated Ocean-ice Reference Experiments - Interannual Forcing) dataset was used to force two ocean models, LICOM3 (LASG/IAP Climate System Ocean Model Version 3), and POP2 (Parallel Ocean Program version 2). The North Equatorial Countercurrent (NECC) simulated by these two models was to be found weaker than the observation. These results were consistent with the findings of Sun et al. (2019), which further suggests that surface wind stress and its curl are the most important forcing terms in correctly simulating the NECC in ocean models. At the same time, the differences in NECC dynamical mechanisms between LICOM3 and POP2 were analyzed, including wind stress, advection, and other terms. In spite of the same CORE-IAF dataset being used to force these two ocean models, the influences of dynamical forcing terms (wind stress, advection, and other terms) were not exactly the same.

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孙志阔,刘海龙,林鹏飞,于子棚,李逸文. LICOM3.0海洋模式中太平洋北赤道逆流的模拟偏差分析.大气科学,2020,44(3):591~600 SUN Zhikuo, LIU Hailong, LIN Pengfei, Yü Zipeng, LI Yiwen. Simulation Bias Analysis of Pacific North Equatorial Countercurrent in LICOM3.0 Ocean Model. Chinese Journal of Atmospheric Sciences (in Chinese),2020,44(3):591~600

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  • 收稿日期:2019-03-02
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  • 在线发布日期: 2020-05-26
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