Progress in Earth and Planetary Science ( IF 3.9 ) Pub Date : 2020-11-09 , DOI: 10.1186/s40645-020-00381-9 Tatsuo Suzuki , Hiroaki Tatebe
In the present study, the relative importance of ocean heat uptake and heat redistribution on future sea level changes in the western North Pacific has been reconciled based on a set of climate model experiments in which anomalous surface fluxes of wind stress, heat, and freshwater in a warmed climate are separately given to those fluxes in a pre-industrial control simulation. Our findings suggest that the basin-wide ocean heat uptake and resultant heat accumulation by the climatological-mean advection are required to explain the future dynamic sea level (DSL) rise in the western subtropical North Pacific caused by the thermal expansion of subtropical mode water (STMW). At the same time, it has been recognized that the localized heat uptake in association with the wintertime mixed-layer formation around the Kuroshio Extension can be solely attributed to the future STMW change. The thermally induced component is a dominant contribution to the future DSL rise in the western subtropical North Pacific compared to the contributions of wind-induced and halosteric components, which, especially the former, have been reported as a dominant factor resulting from a linear response of the ocean to the northward shift and strengthening of the mid-latitude westerly over the North Pacific in a warmed climate.
中文翻译:
全球变暖下西亚热带北太平洋未来的动态海平面变化与海洋热量吸收和海洋循环带来的热量再分配有关
在本研究中,根据一组气候模型实验,调和了北太平洋西部海域热量吸收和热量再分配对未来海平面变化的相对重要性,在该实验中,风应力,热量和淡水的异常表面通量处于较高水平。在工业化前的控制模拟中,将这些通量分别赋予温暖的气候。我们的发现表明,需要通过气候平均对流来获得整个盆地的海洋热量吸收和由此产生的热量积聚,以解释由亚热带模式水的热膨胀引起的西亚热带北太平洋未来的动态海平面(DSL)上升( STMW)。同时,已经认识到,与黑潮扩展区周围的冬季混合层形成相关的局部热量吸收完全可以归因于未来的STMW变化。与风致和风能成分相比,热致成分是西部亚热带北太平洋未来DSL增长的主要贡献,风致和风能成分尤其是前者已被报告是由线性响应和线性变化引起的主要因素。海洋向北移动,并在温暖的气候下加强北太平洋上的中纬度西风。