Causes of Changes in the Denmark Strait Overflow
Causes of Changes in the Denmark Strait Overflow
复制标题
丹麦海峡溢流变化的原因
DOI：
10.1175/jpo3080.1
复制
发表时间：
2007
影响因子：
3.5
通讯作者：
N. Serra
中科院分区：
文献类型：
--
作者：
A. Köhl;R. Käse;D. Stammer;N. Serra
摘要北欧海的变暖可能会减少格陵兰-冰岛-苏格兰海岭（GISR）系统的溢出。Macrander等人最近的观测记录表明，3年内流出的丹麦海峡溢流水强度显著下降20%以上，同时底层温度升高0.4°C以上。在这里使用的区域海洋环流模式，以确定可能的机制，控制在丹麦海峡溢出的变化和它的关系，改变强迫条件的交换模拟。在季节性和较长的时间尺度上，作者建立链接的溢出异常的密集水库的容量减少所造成的环流模式的变化北部的窗台。在年尺度和较短的时间尺度上，冰岛周围的风应力旋度决定了冰岛周围的正压环流，从而决定了通过丹麦海峡的正压气流。对于重叠的时间sc.
Abstract The warming Nordic seas potentially tend to decrease the overflow across the Greenland–Iceland–Scotland Ridge (GISR) system. Recent observations by Macrander et al. document a significant drop in the intensity of outflowing Denmark Strait Overflow Water of more than 20% over 3 yr and a simultaneous increase in the temperature of the bottom layers of more than 0.4°C. A simulation of the exchange across the GISR with a regional ocean circulation model is used here to identify possible mechanisms that control changes in the Denmark Strait overflow and its relations to changed forcing condition. On seasonal and longer time scales, the authors establish links of the overflow anomalies to a decreasing capacity of the dense water reservoir caused by a change of circulation pattern north of the sill. On annual and shorter time scales, the wind stress curl around Iceland determines the barotropic circulation around the island and thus the barotropic flow through Denmark Strait. For the overlapping time sc...