加利福尼亚湾温盐阶梯的发现  

Discovery of thermohaline staircases in the Gulf of California

作　　者：孟令寒 宋海斌[1,2] 梁智超 范文豪 刘梦丽 杨顺 MENG LingHan;SONG HaiBin;LIANG ZhiChao;FAN WenHao;LIU MengLi;YANG Shun(State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China;School of Ocean and Earth Science,Tongji University,Shanghai 200092,China)

机构地区：[1]海洋地质国家重点实验室,同济大学,上海200092 [2]海洋与地球科学学院,同济大学,上海200092

出　　处：《地球物理学报》2023年第4期1634-1648,共15页Chinese Journal of Geophysics

基　　金：国家自然科学基金(42176061,41976048)资助。

摘　　要：基于历史CTD数据和EW0210航次的部分地震测线,在加利福尼亚湾首次发现了盐指型温盐阶梯,并对其尺度和规模有了较为清晰的认识.经分析发现在该区域水深100~600 m范围内主要发育有层厚较大的温盐阶梯,其中均匀混合层厚度可达几十米甚至上百米,水平方向上连续性好,界面处热通量主要集中在-0.1~-0.2 W·m^(-2),盐通量主要集中在-1×10^(-7)~-2×10^(-7)m·s^(-1).受地形引起的内潮波或涡旋的影响,阶梯层抖动剧烈,上下起伏较大,部分反射层垂向位移甚至可达80 m,由此推测该阶梯结构可能将会被破坏.Based on historical CTD data and partial seismic lines from the EW0210 cruise,"salt finger"thermohaline staircases were identified in the Gulf of California for the first time,and their scale and lateral extensions were clearly understood.The analysis reveals that there are mainly thermohaline staircases with large mixed layer thicknesses in the water depth range of 100~600 m,in which the well-mixed layers can be tens or even hundreds of meters thick,with good continuity in the horizontal direction.The heat flux at the interface is mainly concentrated in-0.1 to-0.2 W·m^(-2),and the salt flux is mainly concentrated in-1×10^(-7)to-2×10^(-7)m·s^(-1).Due to the influence of the internal tidal waves or eddies caused by the topography,these staircases are fluctuating strongly,with large undulations,and vertical displacements of some reflective layers can even reach 80 m.It is thus inferred that the staircases structure is being destroyed.

关 键 词：温盐阶梯 双扩散参数 地震海洋学 加利福尼亚湾 

分 类 号：P631[天文地球—地质矿产勘探] P738[天文地球—地质学]