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Heat and salinity transport between the permanent pycnocline and the mixed layer due to the obduction process evaluated from a gridded Argo dataset
Journal of Oceanography ( IF 2.3 ) Pub Date : 2020-08-09 , DOI: 10.1007/s10872-020-00559-1
Yoshimi Kawai , Shigeki Hosoda , Kazuyuki Uehara , Toshio Suga

It is necessary for air–sea interaction and climate research to evaluate heat and salinity transport between the mixed layer (ML) and the permanent pycnocline and its contribution to the ML properties. The authors have calculated the obduction and subduction rates with the Eulerian definition using a 1°-grid Argo dataset and incorporated the obduction rate into the ML budget analysis in order to assess the impact of the entrained permanent pycnocline water on the ML temperature and salinity. They have successfully separated the effect of obduction on the ML from the entrainment of the seasonal pycnocline, and specified the regions where the obduction impact is noticeable. The ML heating rate due to obduction was smaller than ± 0.1 K/yr on average over most of the domain, but it was larger than − 0.5 K/yr in places around the Circumpolar Current, in the northeastern tropical Pacific, the southwestern tropical Indian Ocean, and the northeastern North Atlantic. The salinizing rate due to obduction exceeded ± 0.02 psu/yr in these areas, and in the subarctic North Pacific and the eastern South Pacific. The waters entrained from the permanent pycnocline warm and salinize the ML in the high latitudes due to the dichothermal structure. The method applied in this study also enabled us to assess the residence time and route of obducted and subducted water parcels below the ML. Furthermore, the authors examined the changes of obduction and subduction related with the marine heatwave that occurred in the northeastern North Pacific around 2014.

中文翻译:

由于从网格化的 Argo 数据集评估的外延过程,永久火山口和混合层之间的热量和盐度传输

对于海气相互作用和气候研究,有必要评估混合层 (ML) 和永久偏斜层之间的热量和盐度传输及其对 ML 特性的贡献。作者使用 1° 网格 Argo 数据集计算了欧拉定义的俯冲率和俯冲率,并将俯冲率纳入 ML 预算分析,以评估夹带的永久密旋层水对 ML 温度和盐度的影响。他们成功地将外倾对 ML 的影响与季节性 pycnocline 的夹带分开,并指定了外倾影响显着的区域。在大部分域中,由于外吸引起的 ML 加热速率平均小于 ± 0.1 K/yr,但在绕极电流周围的地方大于 - 0.5 K/yr,在热带太平洋东北部、热带印度洋西南部和北大西洋东北部。在这些地区以及亚北极北太平洋和南太平洋东部,由于外吸引起的盐渍化率超过 ± 0.02 psu/yr。由于双温结构,从永久的火山口夹带的水使高纬度地区的 ML 变暖并使 ML 盐化。本研究中应用的方法还使我们能够评估 ML 下方俯冲和俯冲水块的停留时间和路线。此外,作者还研究了与 2014 年左右发生在北太平洋东北部的海洋热浪相关的俯冲和俯冲变化。在这些地区以及亚北极北太平洋和南太平洋东部,由于外吸引起的盐渍化率超过 ± 0.02 psu/yr。由于双温结构,从永久的火山口夹带的水使高纬度地区的 ML 变暖并使 ML 盐化。本研究中应用的方法还使我们能够评估 ML 下方俯冲和俯冲水块的停留时间和路线。此外,作者还研究了与 2014 年左右发生在北太平洋东北部的海洋热浪相关的俯冲和俯冲变化。在这些地区以及亚北极北太平洋和南太平洋东部,由于外吸引起的盐渍化率超过 ± 0.02 psu/yr。由于双温结构,从永久的火山口夹带的水使高纬度地区的 ML 变暖并使 ML 盐化。本研究中应用的方法还使我们能够评估 ML 下方俯冲和俯冲水块的停留时间和路线。此外,作者还研究了与 2014 年左右发生在北太平洋东北部的海洋热浪相关的俯冲和俯冲变化。本研究中应用的方法还使我们能够评估 ML 下方俯冲和俯冲水块的停留时间和路线。此外,作者还研究了与 2014 年左右发生在北太平洋东北部的海洋热浪相关的俯冲和俯冲变化。本研究中应用的方法还使我们能够评估 ML 下方俯冲和俯冲水块的停留时间和路线。此外,作者还研究了与 2014 年左右发生在北太平洋东北部的海洋热浪相关的俯冲和俯冲变化。
更新日期:2020-08-09
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