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Response of the mixed layer depth and subduction rate in the subtropical Northeast Pacific to global warming
Acta Oceanologica Sinica ( IF 1.4 ) Pub Date : 2021-02-11 , DOI: 10.1007/s13131-021-1818-y
Ruibin Xia , Bingrui Li , Chen Cheng

The response of the mixed layer depth (MLD) and subduction rate in the subtropical Northeast Pacific to global warming is investigated based on 9 CMIP5 models. Compared with the present climate in the 9 models, the response of the MLD in the subtropical Northeast Pacific to the increased radiation forcing is spatially nonuniform, with the maximum shoaling about 50 m in the ensemble mean result. The inter-model differences of MLD change are non-negligible, which depend on the various dominated mechanisms. On the north of the MLD front, MLD shallows largely and is influenced by Ekman pumping, heat flux, and upper-ocean cold advection changes. On the south of the MLD front, MLD changes a little in the warmer climate, which is mainly due to the upper-ocean warm advection change. As a result, the MLD front intensity weakens obviously from 0.24 m/km to 0.15 m/km (about 33.9%) in the ensemble mean, not only due to the maximum of MLD shoaling but also dependent on the MLD non-uniform spatial variability. The spatially non-uniform decrease of the subduction rate is primarily dominated by the lateral induction reduction (about 85% in ensemble mean) due to the significant weakening of the MLD front. This research indicates that the ocean advection change impacts the MLD spatially non-uniform change greatly, and then plays an important role in the response of the MLD front and the subduction process to global warming.



中文翻译:

亚热带东北太平洋混合层深度和俯冲速率对全球变暖的响应

基于9个CMIP5模型,研究了亚热带东北太平洋混合层深度(MLD)和俯冲速率对全球变暖的响应。与9个模型中的当前气候相比,亚热带东北太平洋MLD对辐射强迫增加的响应在空间上是不均匀的,集合平均结果中最大浅滩约50 m。MLD变化的模型间差异是不可忽略的,这取决于各种主导机制。在MLD前沿的北部,MLD变浅很大,并受到埃克曼抽水,热通量和上洋冷对流变化的影响。在MLD锋线的南部,MLD在较暖的气候中变化不大,这主要是由于上海洋的暖平流变化所致。结果,MLD的前强度从0明显减弱。总体平均值为24 m / km至0.15 m / km(约33.9%),这不仅是由于MLD暗挖的最大值,而且还取决于MLD的非均匀空间变异性。由于MLD锋面明显减弱,俯冲速率在空间上的不均匀下降主要是由横向感应下降(整体平均值约为85%)所决定。研究表明,海洋平流变化对MLD的空间非均匀变化影响很大,在MLD锋面的俯冲和俯冲过程对全球变暖的响应中起着重要作用。由于MLD锋面明显减弱,俯冲速率在空间上的不均匀下降主要是由横向感应下降(整体平均值约为85%)所决定。研究表明,海洋平流变化对MLD的空间非均匀变化影响很大,在MLD锋面的俯冲和俯冲过程对全球变暖的响应中起着重要作用。由于MLD锋面明显减弱,俯冲速率在空间上的不均匀下降主要是由横向感应下降(整体平均值约为85%)所决定。研究表明,海洋平流变化对MLD的空间非均匀变化影响很大,在MLD锋面的俯冲和俯冲过程对全球变暖的响应中起着重要作用。

更新日期:2021-02-11
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