Circulation and Transport at the Southeast Tip of Greenland
Circulation and Transport at the Southeast Tip of Greenland
复制标题
格陵兰岛东南端的流通和运输
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
H. Mercier
中科院分区：
文献类型：
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作者：
Nathalie Daniault;P. Lherminier;H. Mercier
摘要根据系泊海流仪阵的直流观测资料，确定了格陵兰岛东南端的环流和相关输送。测量的时间跨度从2004年6月到2006年6月。东格陵兰-伊明格海流从中陆架(60°N距海岸20公里)到2070m等深线(离岸约100公里)的净平均西南输送估计为17.3Sv(Sv≡106m~3 S−1)，不确定度为1Sv。输运变异性的特征是标准偏差为3.8Sv，峰间幅度高达30Sv。季节变化的幅度为1.5Sv。信号以0.1d−1左右的频率为主，但冬季也出现较低频率的变化(∼1个月−1)。对于大于5天的周期，在95%的置信度水平下，观测到的厄明格海输送变率与风应力旋度变率之间的一致性明显不同于0。
Abstract The circulation and related transports at the southeast tip of Greenland are determined from direct current observations of a moored current meter array. The measurements cover a time span from June 2004 to June 2006. The net mean total southwestward transport of the East Greenland–Irminger Current from the midshelf (20 km off the coast at 60°N) to the 2070-m isobath (about 100 km offshore) was estimated as 17.3 Sv (Sv ≡ 106 m3 s−1) with an uncertainty of 1 Sv. The transport variability is characterized by a standard deviation of 3.8 Sv with a peak-to-peak amplitude up to 30 Sv. The seasonal variability has an amplitude of 1.5 Sv. Frequencies around 0.1 day−1 dominate the signal, although a variability at lower frequency (∼1 month−1) also appears in winter. The coherence between the observed transport variability and the wind stress curl variability over the Irminger Sea differs significantly from 0 at the 95% confidence level for periods greater than 5 days.