摘要
山东半岛东部耳状锋面区的冬季海雾是一个重要但被忽视了的海气相互作用现象。利用AVHRR Pathfinder Version 5.2数据中SST资料的质量数值,通过转换和归一化处理,简单有效地提取了耳状锋面区海雾的覆盖区域和海雾强度的信息。结果显示海雾的空间分布与耳状锋面非常一致,亦呈现"耳状",其覆盖面积和强度存在显著的季节内变化。海雾一般开始出现于12月的上旬,位于耳状锋面南段的海域。之后,海雾的覆盖区域迅速北扩,覆盖面积不断增大且强度不断增强,并于2月达到峰值后进入衰减期,至3月下旬基本消失。海雾的季节内变化与冬季风风速、黄海西侧沿岸流、黄海暖流的季节内变化及它们之间的超前/滞后关系密切相关。海雾强度的主轴位置相对比较固定,位于40~50m等深线附近,没有显著的季节内变化,其原因是耳状锋面的主轴位置受控于水深分布,不随时间变化。本研究所建立的提取海雾关键信息的方法以及海雾与季风、环流、耳状锋面这三者的相互关系还需要观测和数值模拟的进一步验证。
Sea fog formed due to the ear-shaped thermal front（ESTF）to the east of the Shandong Peninsular in winter is an important but neglected air-sea interaction phenomenon in the Yellow Sea.In present study,quality numbers provided with the SST of the AVHRR Pathfinder Version 5.2 data can be used to represent the coverage and intensity of sea fog by simply conversion and normalization.Results show that the spatial distribution of sea fog,just like the ESTF,also demonstrates an ear-shape,and its coverage and intensity shows remarkable intra-seasonal variation.The sea fog usually appear in early December above the southern segment of the ESTF.Its coverage extends northward in the following months with intensity increased rapidly and peaks in February and decays in March.The intra-seasonal variability of the sea fog is closely linked to variation of the East Asian monsoon,coastal currents in the western Yellow Sea,and the Yellow Sea Warm Current as well as their lead/lag relationships.Axis of the sea fog basically follows the isobaths of 40~50 mand shows little intra-seasonal variability.This is because the axis of the ESTF is mainly controlled by the distribution of bathymetry of the Yellow Sea,which is independent of time.The method established for extracting the information of the sea fog and the relationship between the sea fog and the monsoon,circulation,ESTF need to be further investigated by observational measurements and numerical simulations.
出处
《海洋科学进展》
CAS
CSCD
北大核心
2017年第4期483-494,共12页
Advances in Marine Science
基金
国家自然科学基金项目--东亚季风年代际变异对黄海暖流及局地海-气相互作用的影响(41576028)
国家自然科学基金委员会-山东省人民政府联合资助海洋科学研究中心项目--海洋环境动力学和数值模拟(U1606405)
