Characterizing the eddy field in the Arctic Ocean halocline
Characterizing the eddy field in the Arctic Ocean halocline
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DOI：
10.1002/2014jc010488
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发表时间：
2014-12
影响因子：
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通讯作者：
Mengnan Zhao;M. Timmermans;S. Cole;R. Krishfield;A. Proshutinsky;J. Toole
中科院分区：
文献类型：
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作者：
Mengnan Zhao;M. Timmermans;S. Cole;R. Krishfield;A. Proshutinsky;J. Toole
2004年至2013年间在北冰洋部署的冰系剖面仪（ITP）提供了各种盐斜漩涡的详细温度和盐度测量数据。共探测到127个中尺度涡旋，其中95%为反气旋，其中大部分具有异常冷核。这些冷核反气旋涡旋在波弗特环流区（加拿大水涡旋）和跨极流附近（欧亚水涡旋）被观测到。利用ITP资料和气候学资料进行了全北极范围内第一次斜压罗斯比变形半径Rd的计算；在加拿大水域Rd ~ 13公里，在欧亚水域Rd ~ 8公里。观测到的涡旋具有与Rd相当的尺度。盐斜涡旋处于循环地转平衡状态，可以用最大方位速度在0.05 ~ 0.4 m/s之间的朗肯涡旋来描述。漩涡半径与厚度之间的关系与对环境分层的调整是一致的。漩涡可分为四组，每组都具有不同的岩心深度和岩心温度和盐度特征，这表明存在多个来源区域，并可以推测不同的形成机制。
Ice-Tethered Profilers (ITP), deployed in the Arctic Ocean between 2004 and 2013, have provided detailed temperature and salinity measurements of an assortment of halocline eddies. A total of 127 mesoscale eddies have been detected, 95% of which were anticyclones, the majority of which had anomalously cold cores. These cold-core anticyclonic eddies were observed in the Beaufort Gyre region (Canadian water eddies) and the vicinity of the Transpolar Drift Stream (Eurasian water eddies). An Arctic-wide calculation of the first baroclinic Rossby deformation radius Rd has been made using ITP data coupled with climatology; Rd ∼ 13 km in the Canadian water and ∼8 km in the Eurasian water. The observed eddies are found to have scales comparable to Rd. Halocline eddies are in cyclogeostrophic balance and can be described by a Rankine vortex with maximum azimuthal speeds between 0.05 and 0.4 m/s. The relationship between radius and thickness for the eddies is consistent with adjustment to the ambient stratification. Eddies may be divided into four groups, each characterized by distinct core depths and core temperature and salinity properties, suggesting multiple source regions and enabling speculation of varying formation mechanisms.