Estimates of the zonal slope and seasonal transport of the Atlantic North Equatorial Countercurrent
Estimates of the zonal slope and seasonal transport of the Atlantic North Equatorial Countercurrent
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大西洋北赤道逆流的纬向坡度和季节性输送的估计
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
E. Katz
中科院分区：
文献类型：
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作者：
J. Carton;E. Katz
我们使用的数据，从六个倒置回声测深系泊和地球卫星高度计检查海面高程的季节性变化。每月的海平面图是利用同期的地下温度调查来制作的，以提供参考海平面场。然后，地图被用来描述的起源和结构的西热带大西洋北赤道逆流（NECC）在1987年11月开始的2年期间。资料显示，在3°N ~ 9°N之间存在一个典型宽度为300 km的纬向流。NECC在1986年11月和12月以及1987年5月至1988年1月期间强烈向东流动。然后，海流的重现被推迟到8月，但从8月到1988年10月我们记录的结束，海流都很强劲。通过将海洋的垂直结构近似为两层流体，估计了从表面高度起的2年期间的体积运输。我们发现NECC在38°W时的最大输运为40×106 m3 s−1。这些水来自北巴西洋流的回流。在西经38°以东，NECC失去强度，因为水流离开海流，加入更南部的海流。
We use data from six inverted echo sounder moorings and the Geosat satellite altimeter to examine the seasonal variability of sea surface elevation. Monthly sea level maps are constructed using a contemporaneous subsurface temperature survey to provide a reference sea level field. The maps are then used to describe the origin and structure of the western tropical Atlantic North Equatorial Countercurrent (NECC) during a 2-year period beginning in November 1987. The data reveal a zonal current which is confined between 3°N and 9°N with a typical width of 300 km. The NECC flows strongly eastward during November and December 1986 and May 1987 through January 1988. The reappearance of the current is then delayed until August, but the current flows strongly from August until the end of our record in October 1988. Volume transport is estimated for the 2-year period from surface elevation by approximating the vertical structure of the ocean as a two-layer fluid. We find that the NECC has a maximum transport of 40×106 m3 s−1 at 38°W. This water has its origin in the retroflection of the North Brazil Current. Eastward of 38°W the NECC loses strength as water exits the current to join the currents further south.