An anticyclonic circulation above the Northwest Georgia Rise, Southern Ocean
An anticyclonic circulation above the Northwest Georgia Rise, Southern Ocean
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南大洋西北乔治亚海隆上空的反气旋环流
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
F. Vivier
中科院分区：
文献类型：
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作者：
M. Meredith;J. L. Watkins;E. Murphy;Nathan J. Cunningham;A. G. Wood;R. Korb;M. Whitehouse;S. Thorpe;F. Vivier
来自各种来源的数据显示，在格鲁吉亚西北隆起（NWGR）上方存在一个暖心反气旋环流，NWGR是南格鲁吉亚北部的一个2000米高的水深特征。这种环流与格鲁吉亚盆地的一般气旋性环流方向相反。环流显示出泰勒柱分层的特征：量纲分析表明，当地的水深和水文有利于形成这种。ERS 2高度计数据显示，该柱虽然不是完全永久的，但仍然是一个经常出现的特征。在环流中心观察到高浓度的叶绿素a，表明物理环境的调节通过增强初级生产对当地的生物地球化学系统产生了重大影响。增强的叶绿素a从NWGR沿着漂流物指示的路径沿着延伸成长羽状;这种被动再分配可能对更大（流域）尺度的生态系统产生影响。
Data from a variety of sources reveal a warm‐core anticyclonic circulation above the Northwest Georgia Rise (NWGR), an ∼2000‐m high bathymetric feature north of South Georgia. The sense of the circulation is opposite to the general cyclonic flow in the Georgia Basin. The circulation shows the characteristics of a stratified Taylor column: dimensional analysis shows that the local bathymetry and hydrography are conducive to the formation of such. ERS2 altimeter data show that the column, whilst not fully permanent, is nonetheless a recurring feature. High concentrations of chlorophyll‐a are observed at the centre of the circulation, indicating that the modulation of the physical environment has significant consequences for the local biogeochemical system via enhanced primary production. Enhanced chlorophyll‐a extends in a long plume from the NWGR along pathways indicated by drifters; this passive redistribution may have consequences for the larger (basin‐) scale ecosystem.