Eddy-induced flow of Scotian Shelf water across Northeast Channel, Gulf of Maine
Eddy-induced flow of Scotian Shelf water across Northeast Channel, Gulf of Maine
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DOI：
10.1016/s0278-4343(98)00001-6
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发表时间：
1998-04-01
影响因子：
2.3
通讯作者：
Smith, PC
中科院分区：
文献类型：
--
作者：
Bisagni, JJ;Smith, PC
历史和最近的数据显示，寒冷，低盐度的水，流动西南沿着外大陆架南部乔治银行在春季发生的情节。仔细的分析表明，西南部的斯科舍大陆架是这些水的来源。例如，在1995年4月至6月期间，从红外卫星数据得到的海表面温度图像显示，从布朗斯岸到乔治斯岸东部，有间歇性的、曲线形的苏格兰陆架冷水舌穿过东北海峡。在一次特定的事件（1995年4月23日至5月1日），SST模式被发现是一致的，与跨海峡流动的SSW沿着的北方边缘的气旋涡位于东北海峡。此外，在此期间的SST模式表明，气旋性涡旋是椭圆形的，具有更大的沿通道的尺寸（类似于50公里）相对于其跨通道的尺寸（类似于25公里）。此外，位于东北海峡的系泊NECE（北纬42度18 '，西经65度51'）的次表层温度、盐度和速度表明，在同一时间段内，气旋涡流通过系泊阵列。在整个水柱中注意到NECE的气旋涡流的影响。东北海峡这种涡旋的强度和频率可能在控制春季物质、热量、盐、浮游生物和小鱼注入乔治浅滩方面发挥很大作用。(C)1998爱思唯尔科技有限公司版权所有。
Historical and recent data show the episodic occurrence of cold, low salinity water, flowing southwestward along the outer shelf on southern Georges Bank during spring. Careful analysis indicates that the southwestern Scotian Shelf is the source of this water. For example, during April-June 1995, sea surface temperature (SST) images derived from infrared satellite data show intermittent, curvilinear tongues of cold Scotian Shelf water (SSW) crossing Northeast Channel from Browns Bank to eastern Georges Bank. During one particular event (23 April-1 May 1995), SST patterns were found to be consistent with cross-channel flow of SSW along the northern margin of a cyclonic eddy located within Northeast Channel. In addition, SST patterns during the period suggest that the cyclonic eddy is elliptical, with a greater along-channel dimension (similar to 50 km) relative to its cross-channel dimension (similar to 25 km). Furthermore, subsurface temperature, salinity and velocity from mooring NECE (42 degrees 18'N, 65 degrees 51'W) located in Northeast Channel show evidence for the passage of a cyclonic eddy through the mooring array during the same time period. The cyclonic eddy's influence at NECE was noted throughout the entire water column. The strength and frequency of such eddies in Northeast Channel may play a large role in controlling the injection of mass, heat, salt, plankton and small fish onto Georges Bank during spring. (C) 1998 Elsevier Science Ltd. All rights reserved.