丹麦海峡海洋锋时空变化特征研究

丹麦海峡海洋锋可为局地气候变化、海峡鱼类分布以及海峡中尺度涡等方面研究提供参考,在军事领域也具有较高应用价值。然而目前国内外缺乏对于丹麦海峡锋的系统研究。本文利用WOA13数据,对丹麦海峡锋位置、强度空间分布以及相应的季节变化进行了分析。结果显示,锋轴线位置在34°W以西150 m以浅相对稳定,34°W以东锋轴线随深度和季节均有摆动。锋强度在水平和垂直方向分布不均匀,水平方向上锋轴线最大值与最小值差值一般在3倍以上。垂直方向盐度锋主要集中在100 m以浅,且强度随深度不断减小;温度锋强度最大值在表层以下且在300 m以深随深度增加锋强度减小,但有一些区域如27°W和28°W附近,受到海底地形的影响温度锋强度随着深度的变化有大幅度增加的特点。

Study on the temporal and spatial variational characteristics of Denmark Strait Ocean Front

Denmark Strait Ocean Front(DSOF) has higher value in oceanographic research, such as provides a reference to the research on local climate change, fish distribution and the mesoscale eddy around the Denmark Strait. In addition, the research of the DSOF also has a higher application value in the military field. However, there has been lack of systematic research domestically and internationally for the DSOF. In this study, using WOA13 data, the location, spatial intensity distribution and the corresponding seasonal variations of the DOSF were analyzed. The results indicate that: the front axis at the west of 34°W is relatively stable above 150 m, whereas it varies with depths as well as seasons at the east of 34°W. The front intensity distribution is not uniform vertically and horizontally, and in general, the difference between maximum and minimum values are as higher as 3 times in the horizontal direction. The vertical salinity front mainly concentrates above 100 meters, and its intensity is decreasing with depth. The maximum value of temperature front intensity locates below the surface, and when the water depth is below 300 meters, it gradually decreases with the increase of water depth, but in some areas, such as at 27°W and 28°W, the front intensity increases quickly because of the affection of the bottom topography.