Seasonal Cycle of Mesoscale Instability of the West Spitsbergen Current
Seasonal Cycle of Mesoscale Instability of the West Spitsbergen Current
复制标题
西斯匹次卑尔根海流中尺度不稳定的季节周期
DOI：
10.1175/jpo-d-15-0184.1
复制
发表时间：
2016
影响因子：
3.5
通讯作者：
A. Beszczynska
中科院分区：
文献类型：
--
作者：
Wilken‐Jon Appen;U. Schauer;T. Hattermann;A. Beszczynska
西斯匹次卑尔根海流（WSC）是一个地形导向的边界流，它将温暖的大西洋水输送到弗拉姆海峡。16年（1997-2012年）的海流和温度-盐度测量在WSC在78°50′N的系泊揭示了在WSC和中央弗拉姆海峡的中尺度变化的动力学。一个强大的季节性波动和拟议的驱动机制。在冬季，水平流在WSC已受到强烈的大气冷却在北欧海，因此，在顶部250米的分层是弱的。海流也比夏季更强，垂直切变也更大。这就导致了冬季斜压不稳定的e-折叠增长期约为半天，表明海流具有快速增长不稳定并形成涡旋的能力。在夏季，WSC的不稳定性显著降低，e-折叠生长期为2天。涡动动能（EKE）的观测结果表明，P.
AbstractThe West Spitsbergen Current (WSC) is a topographically steered boundary current that transports warm Atlantic Water northward in Fram Strait. The 16 yr (1997–2012) current and temperature–salinity measurements from moorings in the WSC at 78°50′N reveal the dynamics of mesoscale variability in the WSC and the central Fram Strait. A strong seasonality of the fluctuations and the proposed driving mechanisms is described. In winter, water is advected in the WSC that has been subjected to strong atmospheric cooling in the Nordic Seas, and as a result the stratification in the top 250 m is weak. The current is also stronger than in summer and has a greater vertical shear. This results in an e-folding growth period for baroclinic instabilities of about half a day in winter, indicating that the current has the ability to rapidly grow unstable and form eddies. In summer, the WSC is significantly less unstable with an e-folding growth period of 2 days. Observations of the eddy kinetic energy (EKE) show a p...
影响因子：
3.6
作者：
Aksenov, Yevgeny;Ivanov, Vladimir V.;Beszczynska-Moeller, Agnieszka
通讯作者：
Beszczynska-Moeller, Agnieszka