大西洋经向翻转环流的模拟对海表驱动场时间和空间分辨率的敏感性分析

发布时间：2018-03-05 06:42

  本文选题：海洋数值模拟　切入点：海洋-海冰耦合数值模式　出处：《海洋科学进展》2016年02期 　论文类型：期刊论文

【摘要】：基于全球海洋-海冰耦合数值模式,研究了不同时间和空间分辨率的海表驱动场对大西洋经向翻转环流(Atlantic Meridional Overturning Circulation,AMOC)和海表面温度(Sea Surface Temperature,SST)模拟的影响。敏感性数值实验结果表明,海表驱动场时间和空间分辨率的不同不仅会影响SST的模拟,而且会显著影响AMOC强度的模拟。相比高时间分辨率的海表驱动场,时间和空间分辨率的降低会造成AMOC模拟强度的减弱和SST的升高。月平均驱动场驱动的AMOC比6h分辨率驱动场驱动的控制实验减少6.7Sv,降低了34%;同为6h分辨率,粗空间分辨率大气驱动场模拟的AMOC比高空间分辨率实验减少1.4Sv,降低了7%。对海洋上层流场和海表热通量进一步分析表明,低时间和空间分辨率的海表风场的减弱是导致AMOC减弱和SST升高的主要原因。
[Abstract]:Based on the coupled global ocean-sea ice numerical model, the effects of the surface driving field with different temporal and spatial resolutions on the simulation of Atlantic Meridional Overturning Circulation (AMOC) and Sea Surface temperature (SST) are studied. The difference of time and spatial resolution of sea surface driving field will not only affect the simulation of SST, but also significantly affect the simulation of AMOC intensity. The decrease of time and spatial resolution will result in the weakening of AMOC simulation intensity and the increase of SST. The average monthly driving field driven AMOC is 6.7Sv less than the 6h resolution driving field control experiment, which is 34% lower than that of 6h resolution. The AMOC of coarse spatial resolution atmospheric driving field simulation is 1. 4 Sv less than that of high spatial resolution experiment, and it is reduced by 7. The further analysis of ocean upper current field and sea surface heat flux shows that, The decrease of sea surface wind field with low temporal and spatial resolution is the main reason for the decrease of AMOC and the increase of SST.
【作者单位】： 中国海洋大学海洋与大气学院;国家海洋局第一海洋研究所;海洋环境科学和数值模拟国家海洋局重点实验室;
【基金】：国家自然科学基金委员会-山东省人民政府联合资助海洋科学研究中心项目——海洋环境动力学和数值(U1406404) 全球变化与海气相互作用专项——海洋动力系统和多运动形态相互作用(GASI-03-IPOVAI-05) 南北极环境综合考察与评估专项——极地对全球和我国气候变化影响的综合评价项目(CHINARE2016-04-04)
【分类号】：P731.27
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本文编号：1569158