Fingerprinting Northeast Atlantic water masses using neodymium isotopes
Fingerprinting Northeast Atlantic water masses using neodymium isotopes
复制标题
使用钕同位素对东北大西洋水团进行指纹识别
DOI：
10.1016/j.gca.2017.04.002
复制
发表时间：
2017
影响因子：
5
通讯作者：
Dubois-Dauphin
中科院分区：
文献类型：
--
作者：
Dubois-Dauphin
对从阿尔沃兰海到冰岛海盆的13个站位的82个海水样品进行了溶解钕（Nd）同位素组成（εNd）分析。因此，在沿着西欧边缘的水团的εNd值的分布进行了首次调查，以探讨是否在东副极地和亚热带大西洋流动的水团揭示不同的同位素模式。阿尔沃兰海的修正大西洋水（MAW）显示出εNd值（介于−9.2 ± 0.2和−8.9 ± 0.2之间），比以前的研究报告（−10.8 ± 0.2到−9.7 ± 0.2）的辐射成因明显更强，这表明从直布罗陀海峡进入地中海的水的Nd同位素组成存在时间变化。第一次确定了下垫面修正的冬季中层水（WIW）的εNd值（−9.8 ± 0.3），与地中海西北部MAW下沉获得的Nd特征一致。在加的斯湾，南部地中海海水（MSW）（−10.6 ± 0.2）与北方的MSW（−9.9 ± 0.4）略有不同，这是由于修改后的东南极中层水（EAAIW）（−10.9 ± 0.2）的重要贡献。在大西洋东北部，北大西洋洋流表层水位于环流间区域（北纬46度以北），其εNd值介于−14.0 ± 0.3和−15.1 ± 0.3之间，反映了副极地环流的特征。沿着西欧边缘，地表水的εNd值向北减小（从−10.4 ± 1.6减小到−13.7 ± 1.0），这与副热带水和副极地水的逐渐混合相一致。在中等深度，εNd值从加的斯湾的−9.9 ± 0.4下降到豪猪湾的−12.1 ± 0.2，表明MSW被副极地水强烈稀释。在罗科尔海槽和冰岛海盆内，中深度的εNd值更负（<−13.5 ± 0.3），表明MSW没有影响，即使在NAO指数较低的时期也是如此。东北大西洋1200米以上的水团明显受到辐射成因较少的拉布拉多海水（LSW）（εNd在−13.4 ± 0.3和−14.0 ± 0.3之间）的影响，后者在冰岛盆地与冰岛-苏格兰溢流水（ISOW）（在−10.3 ± 0.2和−11.3 ± 0.3之间）局部混合。
Dissolved neodymium (Nd) isotopic composition (expressed as εNd) has been analysed for 82 seawater samples collected from 13 stations stretching from the Alboran Sea to the Iceland Basin. The distribution of the εNd values of water masses was thus investigated for the first time along the western European margin in order to explore whether the water masses flowing in the eastern subpolar and subtropical Atlantic reveal distinct isotopic patterns. The Modified Atlantic Water (MAW) in the Alboran Sea displays εNd values (between −9.2 ± 0.2 and −8.9 ± 0.2) that are significantly more radiogenic than those reported in previous studies (−10.8 ± 0.2 to −9.7 ± 0.2), suggesting temporal variations in the Nd isotopic composition of the water that enters the Mediterranean Sea from the Strait of Gibraltar. The εNd value of the underlying modified Winter Intermediate Water (WIW) has been established for the first time (−9.8 ± 0.3) and is compatible with a Nd signature acquired from the sinking of MAW in the northwestern Mediterranean Sea. Within the Gulf of Cádiz, southern Mediterranean Sea Water (MSW) (−10.6 ± 0.2) differs slightly from the northern MSW (−9.9 ± 0.4) owing to a significant contribution of modified East Antarctic Intermediate Water (EAAIW) (−10.9 ± 0.2). In the northeast Atlantic, the North Atlantic Current surface water located in the inter-gyre region (north of 46°N) displays εNd values of between −14.0 ± 0.3 and −15.1 ± 0.3, reflecting the subpolar gyre signature. Along the western European margin, εNd values of surface water decrease toward the north (from −10.4 ± 1.6 to −13.7 ± 1.0) in agreement with the gradual mixing between subtropical and subpolar water. At intermediate depth, εNd values decrease from −9.9 ± 0.4 within the Gulf of Cádiz to −12.1 ± 0.2 within the Porcupine Seabight, indicating a strong dilution of the MSW with subpolar water. Within the Rockall Trough and the Iceland Basin, the more negative εNd values at mid-depth (<−13.5 ± 0.3) indicate that the MSW has no influence, even during periods of low NAO index. Water masses deeper than 1200 m in the northeast Atlantic are clearly influenced by the less radiogenic Labrador Sea Water (LSW) (εNd between −13.4 ± 0.3 and −14.0 ± 0.3) that mixes locally in the Iceland basin with the Iceland-Scotland Overflow Water (ISOW) (between −10.3 ± 0.2 and −11.3 ± 0.3).
登录
查看更多内容
加那利群岛和非洲海岸之间的东部边界流系统
DOI：
--
发表时间：
2001
期刊：
影响因子：
--
作者：
M. Knoll;A. Hernández‐Guerra;B. Lenz;F. L. Laatzen;F. Machín;T. Müller;G. Siedler
通讯作者：
G. Siedler
DOI：
--
发表时间：
1936
期刊：
影响因子：
--
作者：
C. Iselin
通讯作者：
C. Iselin
影响因子：
5.3
作者：
T. Stichel;M. Frank;J. Rickli;B. Haley
通讯作者：
T. Stichel;M. Frank;J. Rickli;B. Haley
告别角附近丹麦海峡溢流水道的水文变化具有数十年至每周的时间尺度
DOI：
--
发表时间：
2012
期刊：
影响因子：
--
作者：
H. V. van Aken;M. D. de Jong
通讯作者：
M. D. de Jong
Vivaldi 1991 - 北大西洋东部中央水的形成、循环和通风研究
影响因子：
4.1
作者：
R. Pollard;M. Grifftths;S. Cunningham;J. Read;F. F. Pérèz;A. Ríos
通讯作者：
A. Ríos