全球变暖停滞期间海洋次表层增温机制研究  

The Mechanism of Oceanic Subsurface Warming During the Hiatus Period

作　　者：许卓弈 刘浩[2] 林霄沛[1,3] 吴德星[1] Xu Zhuoyi;Liu Hao;Lin Xiaopei;Wu Dexing(The Key Laboratory of Physical Oceanography,Ministry of Education,Ocean University of China,Qingdao 266100,China;Institute of Oceanographic Instrumentation,Qilu University of Technology(Shandong Academy of Science),Qingdao 266100,China;Sanya Oceanographic Institution,Ocean University of China,Sanya 572000,China)

机构地区：[1]中国海洋大学物理海洋教育部重点实验室,山东青岛266100 [2]山东省科学院海洋仪器仪表研究所(齐鲁工业大学),山东青岛266100 [3]中国海洋大学三亚海洋研究院,海南三亚572000

出　　处：《中国海洋大学学报（自然科学版）》2023年第1期1-8,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(92058203,41925025)资助。

摘　　要：全球变暖停滞期间,海洋表层升温速度减缓,同时次表层出现增温现象。针对变暖停滞期的海洋热含量垂向再分配机制,本研究基于海洋再分析产品ECCO4以及Ishii次表层温度数据集、NCEP2、卫星高度计数据等观测资料,采用新的诊断方法评估绝热和非绝热过程对海洋热含量变化率垂向结构与水平空间分布的影响。结果显示,2002—2011年期间,沿等密面、跨等密面非绝热垂向热通量的变化主要发生在热带外海域,且呈现正负相抵的状态。相反,风驱动的绝热调整对垂向净热通量的改变起主导作用。因此,在全球变暖停滞期间,海洋热含量的垂向再分配主要归因于风驱动而非扩散过程。1993—2011年北大西洋副极地海盆区风应力旋度变化率主要为负值,一方面不利于正风应力旋度引起的向上热输送,另一方面加强了负风应力旋度导致的向下热输运,这一现象解释了该海域次表层内海洋热含量的增加和温度的升高。During the global warming hiatus(which is called Hiatus), the increase of sea surface temperature is slowing down and warming in the subsurface is happening in the early 2000s. Still under debate are mechanisms that give rise to such a subsurface warming and the vertical redistribution of OHC(Oceanic Heat Content). Here we apply a novel diagnostic method to evaluate both adiabatic and diabatic processes based on an ocean reanalysis product ECCO4 and observations including Ishii dataset, NCEP2 and altimeter data. Results show that during 2002—2011, variability of diabatic vertical heat fluxes due to isopycnal and diapycnal diffusion occurs mainly in extratropical areas and tends to cancel each other. On the contrary, the wind-induced adiabatic adjustments dominate variability of net vertical heat flux. Thus, it is the wind-driven processes rather than diffusive processes, that are responsible for the vertical redistribution in OHC. From 1993 to 2011, wind stress curl in the North Atlantic subpolar basin showed a negative trend. As a result, upward heat transport caused by positive wind stress curl was impaired and downward heat transport caused by negative wind stress curl was strengthened, which explained the increase of OHC and temperature in the subsurface.

关 键 词：全球变暖停滞 海洋热含量 垂向热输运 风应力旋度 

分 类 号：P731.21[天文地球—海洋科学]