New insights in the French Guiana continental shelf circulation and its relation to the North Brazil Current retroflection
New insights in the French Guiana continental shelf circulation and its relation to the North Brazil Current retroflection
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法属圭亚那大陆架环流及其与巴西北流逆反射关系的新见解
DOI：
10.1029/2006jc003520
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发表时间：
2007
影响因子：
--
通讯作者：
J. Fuda
中科院分区：
文献类型：
--
作者：
M. Baklouti;J. Devenon;A. Bourret;J. Froidefond;J. Ternon;J. Fuda
[1]本文介绍了2003年10月6日至2004年2月18日在法属圭亚那大陆架进行的系泊海流测量。两种相反的情况已经得到证明，在第一阶段（从10月到12月初），电流是弱的和振荡的，或强大的和西北在其余的调查。根据中分辨率成像分光辐射计卫星图像对这些测量结果进行的进一步分析表明，这些情况主要是由于外大陆架中尺度功能：北巴西海流（NBC）回折运动造成的。本次调查还证明了另外两个主要结果：（1）当NBC在法属圭亚那大陆架西北方向发生回折时，部分NBC会爬上大陆架斜坡并向大陆架内传播;（2）“圭亚那海流”在22米及以下深度不会全年持续存在。最后，NBC后向反射的位置也对亚马逊羽流在法属圭亚那大陆架上的传播产生了强烈的影响，并被认为对该地区的营养供应产生了影响。
[1] Moored current measurements carried out from 6 October 2003 to 18 February 2004 over the French Guiana continental shelf are presented. Two contrasted situations have been evidenced in which the currents were either weak and oscillating during the first period (from October to early December) or strong and northwestward during the rest of the survey. Further analysis of these measurements in light of Moderate Resolution Imaging Spectroradiometer satellite images have revealed that these situations are mainly due to the motion of an outer shelf mesoscale feature: the North Brazil Current (NBC) retroflection. Two other main results have also been evidenced in this survey: (1) When the NBC retroflection occurs northwestward of the French Guiana continental shelf, part of the NBC climbs over the shelf slope and propagates to the inner shelf, and (2) the “Guyana current” does not persist throughout the year at a 22 m depth and below. Finally, the location of the NBC retroflection has also a strong impact on the spread of the Amazon plume over the French Guiana continental shelf and is felt to have an influence on the nutrient supply in this region.