北冰洋春夏季海洋大气边界层特征的初步研究

Study of the Structure of Spring and Summer Arctic Marine Atmospheric Boundary Layer

采用 1998年北冰洋表面热量平衡 (SHEBA)试验的飞机探测资料 ,分析北冰洋春、夏季海洋大气边界层 (MABL)的特征。结果表明 :春季北冰洋MABL基本为近中性层结 ,夏季为弱稳定层结 ;春季边界层高度高于夏季。MABL垂直结构可分为近地层、云下混合层、云层和逆温层 ;MABL顶的层积云呈块状分布 ,云层内湍流输送活跃 ;通量输送水平不均匀 ,动量、感热通量多向下输送、潜热通量向上输送 ;

Based on the aircraft sounding data of the SHEBA (Surface Heat Budget of the Arctic Ocean) experiment in 1998, this paper analyzed the character and turbulent structure of MABL (Marine Atmospheric Boundary Layer) over the Arctic Ocean during spring and summer. The results show that the MABL in the Arctic Ocean is prominently different from other areas. The MABL in spring is close to near-neutral stratification, but close to weak-stable stratification in summer. The MABL height in spring is higher than in summer. The MABL can be divided into four layers: the surface layer, the mixing layer under cloud, the cloud layer and the inversion layer. In spring, the intensity of turbulence has two maximum as the height rises, but decreases in summer. The momentum flux and sensible heat flux transport downward, but the latent heat flux transports upward.