Oxygen minimum zone in the North Atlantic south and east of the Cape Verde Islands

Oxygen minimum zone in the North Atlantic south and east of the Cape Verde Islands
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北大西洋佛得角群岛南部和东部的最低氧气区

DOI:
10.1029/2007jc004369
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发表时间:
2008
影响因子:
--
通讯作者:
A. Körtzinger
A. Körtzinger
中科院分区:
--
文献类型:
--
作者:
Stramma;P. Brandt;J. Schafstall;F. Schott;J. Fischer;A. Körtzinger

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从CTD水文学、ADCP速度、Argo浮标轨迹和历史数据研究了佛得角群岛南部和东部的开阔海洋氧气最小区(OMZ),重点是区域供应和排放路径。最强的氧气最小值位于北赤道逆流(NECC)以北,大约400至500米深,就在中央水和南极中层水(AAIW)之间的边界上方。结果表明,NECC、4 ~ 6°N的北赤道潜流和8 ~ 10°N的NECC北方分支是夏季和秋季向OMZ提供富氧水的主要来源。在冬季和春季,200米深度处也存在一个弱的向东的NECC,这是由Argo浮标在浅水层漂流得出的。来自200米深度的历史氧气数据证实了这种季节性,在供应路径内夏季和秋季(春季)氧气含量高(低)。与150至300米深度的强氧气供应相比,300至600米深度的OMZ的通风较弱。贫氧水的向西排放发生在几内亚穹丘以北,即,10°N以北,在400至600米深度最明显。2006年7月,在23°W,σθ= 27.1 kg m− 3以上的两个NECC带的总东向输送量约为13 Sv(1 Sv = 106 m3 s −1)。其中约有一半的水量在几内亚穹内循环,或在几内亚穹向西再循环。
The open‐ocean oxygen minimum zone (OMZ) south and east of the Cape Verde Islands is studied from CTD hydrography, ADCP velocities, Argo float trajectories, and historical data, with a focus on the zonal supply and drainage paths. The strongest oxygen minimum is located north of the North Equatorial Countercurrent (NECC) at about 400 to 500‐m depth just above the boundary between Central Water and Antarctic Intermediate Water (AAIW). It is shown that the NECC, the North Equatorial Undercurrent at 4 to 6°N, and a northern branch of the NECC at 8 to 10°N are the sources for oxygen‐rich water supplied to the OMZ in summer and fall. A weak eastward NECC at 200‐m depth also exists in winter and spring as derived from Argo floats drifting at shallow levels. Historical oxygen data from 200‐m depth confirm this seasonality showing high (low) oxygen content in summer and fall (spring) within the supply paths. Compared to the strong oxygen supply at 150 to 300‐m depth, the ventilation of the OMZ at 300 to 600‐m depth is weaker. Westward drainage of oxygen‐poor water takes place north of the Guinea Dome, i.e., north of 10°N, most pronounced at 400 to 600‐m depth. In July 2006 the total eastward transport of both NECC bands aboveσθ= 27.1 kg m−3at 23°W was about 13 Sv (1 Sv = 106m3s−1). About half of this water volume circulates within the Guinea Dome or recirculates westward north of the Guinea Dome.
DOI: 10.1029/91jc02501
发表时间: 1992-01
影响因子: --
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