空气动力学学报2025，Vol.43Issue(6)：82-98,17.DOI:10.7638/kqdlxxb-2025.0034
海洋底混合层研究进展
Research progress of ocean bottom mixed layer
摘要
Abstract
The ocean bottom mixed layer(BML)is a water layer near the seabed influenced by intense turbulent mixing,serving as a critical interface where physical,chemical,and biological processes converge.It plays a key role in global ocean energy and material exchange,as well as biogeochemical cycles.This paper systematically reviews the research progress on the BML,focusing on its structural characteristics,influencing mechanisms,methods for determining and parameterizing its thickness,and the global distribution patterns of BML thickness.Furthermore,future research directions are outlined.The vertical structures of temperature,salinity,and density within the BML are analyzed in detail.The influencing mechanisms are explored,including turbulent mixing induced by bottom shear flows disrupting density stratification,strong turbulence generated by internal wave breaking,topographic effects altering flow velocity and direction while enhancing shear,tidal forces periodically modulating near-bottom currents,and geothermal heating reducing stratification stability.Various methods for determining BML thickness are introduced,such as the threshold method,curvature method,maximum angle method,and relative variance method.Parameterization relationships are discussed,indicating that BML thickness is positively correlated with water depth and turbulent diffusivity but negatively correlated with buoyancy frequency.The global distribution of BML thickness exhibits significant heterogeneity,with thicker layers near mid-ocean ridges.The median BML thickness in the Atlantic,Indian,and Pacific Oceans is 40 m,42 m,and 64 m,respectively,with a global median of 47 m.Finally,future research directions are proposed,emphasizing the need for advanced observational technologies such as deep-sea bottom-mooring systems and autonomous underwater vehicles,enhanced theoretical studies on the interactions between bottom shear flows,internal wave breaking,and topographic effects,and the development of high-resolution numerical simulation methods for the BML.关键词
海洋底混合层/湍流混合/内波破碎/底混合层厚度/参数化Key words
ocean bottom mixed layer/turbulent mixing/internal wave breaking/bottom mixed layer thickness/parameterization分类
数理科学引用本文复制引用
郭双喜,陈家静,黄鹏起,鲁远征,岑显荣,屈玲,周生启..海洋底混合层研究进展[J].空气动力学学报,2025,43(6):82-98,17.基金项目
国家重点研发计划项目(2021YFC3101300) （2021YFC3101300）
国家自然科学基金(42206020,42449907) （42206020,42449907）
