Discrete eddies in the northern North Atlantic as observed by looping RAFOS floats
Discrete eddies in the northern North Atlantic as observed by looping RAFOS floats
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DOI：
10.1016/j.dsr2.2004.12.011
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发表时间：
2005-01-01
影响因子：
3
通讯作者：
Rossby, HT
中科院分区：
文献类型：
--
作者：
Shoosmith, D;Richardson, PL;Rossby, HT
为了研究北大西洋北方的离散涡旋，分析了RAFOS浮标在27.5密度水平附近的轨迹，目的是确定其地理分布和特征。在同一方向上连续两个或两个以上的循环（循环）的浮子被认为是在漩涡中。总的来说，15%（24个浮动年）的浮动数据是循环的。在96个不同的漩涡中发现了108个活套。大约一半的涡旋是气旋性的（49%），一半是反气旋性的（51%），尽管不同地区的百分比有所不同。有几个漩涡在很长一段时间内都是准静止的，其中一个在冰岛海盆中持续了一年多，还有许多其他的漩涡被清楚地转换，通常是在非循环浮标观察到的大气环流方向上。几个漂浮物被困在查理吉布斯（52° N）和法拉第（50° N）断裂带上游（以西）的北大西洋海流附近的漩涡中，这似乎是穿越大西洋中脊的水流的首选路线。五个漂浮物形成四个反气旋，从戈班支脉（北纬47-50°）附近的东部边界向西南方向移动。这些可能是微弱的漩涡，形成于温暖的咸地中海水的残余，沿沿着东部边界向北平流。© 2005爱思唯尔有限公司版权所有。
RAFOS float trajectories near the 27.5 density level were analyzed to investigate discrete eddies in the northern North Atlantic with the objective of determining their geographical distribution and characteristics. Floats that made two or more consecutive loops in the same direction (loopers) were considered to have been in an eddy. Overall 15% (24 float years) of the float data were in loopers. One hundred and eight loopers were identified in 96 different eddies. Roughly half of the eddies were cyclonic (49%) and half were anticyclonic (51%), although the percentages varied in different regions. A few eddies were quasi-stationary for long times, one for over a year in the Iceland Basin, and many others clearly translated, often in the direction of the general circulation as observed by non-looping floats. Several floats were trapped in eddies in the vicinity of the North Atlantic Current just upstream (west) of the Charlie Gibbs (52° N) and Faraday (50° N) Fracture Zones, which seem to be preferred routes for flow crossing the Mid-Atlantic Ridge. Five floats looped in four anticyclones that translated southwestward away from the eastern boundary near the Goban Spur (47-50° N). These could have been weak meddies forming from remnants of warm salty Mediterranean Water advected northward along the eastern boundary. © 2005 Elsevier Ltd. All rights reserved.