本文以Argo轨迹资料计算的赤道太平洋中层流(1 000 m深度流场)作为实测数据,从空间结构特征和时间变化特征两方面对5套常用海洋模式产品(OFES、LICOM、HYCOM、ECCO2和SODA)进行了评估。Argo流场显示赤道太平洋中层流呈条带状结构,且存在明显的西强东弱和南强北弱特征。此外,赤道太平洋中层流存在明显的季节变化且其相位关于赤道对称。5套模式产品的评估结果表明,SODA流场与实测流场最接近,其时空变化特征都与实测流场基本一致;其次是ECCO2流场,除流场动能偏小以外,其他各方面都与实测流场一致;OFES、LICOM和HYCOM流场的模拟效果较差,但都能再现条带状结构特征。
Abstract
A preliminary assessment of the Pacific Equatorial Intermediate Currents (EICs) in five ocean models outputs (OFES, LICOM, HYCOM, ECCO2 and SODA) were conducted according to the spatial and temporal features using observation data which was calculated from Argo trajectories. The EICs in Argo currents field are mainly composed of the alternating east-west zonal jets. In the east-west direction, the currents are strong in the western but weak in the eastern, in the south-north direction, the currents are strong in the southern but weak in the northern. Besides, there are seasonal variations and the phase of seasonal variations is characterized by westward propagation and meridionally symmetrical on the equator. The assessment results show that SODA is the best dataset in these five models, all the characteristics are almost consistent with the observation. The second is ECCO2, the flow field is almost consistent with the observation except the kinetic energy. Then comes the OFES, LICOM and HYCOM, all of them are able to simulate the structures of the alternating zonal jets.
关键词
赤道太平洋 /
中层流场 /
Argo轨迹 /
模式评估
Key words
tropical Pacific Ocean /
mid-depth currents /
Argo trajectory /
ocean models assessment
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基金
国家重点研发计划(2016YFC1401601);国家自然科学基金(41730536);自然资源部第二海洋研究所中央级公益性科研院所基本科研业务费专项资金(14283)
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