Size Matters: Another Reason Why the Atlantic Is Saltier than the Pacific

Size Matters: Another Reason Why the Atlantic Is Saltier than the Pacific
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大小很重要:大西洋比太平洋更咸的另一个原因

DOI:
10.1175/jpo-d-17-0075.1
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发表时间:
2017
影响因子:
3.5
通讯作者:
Cessi, Paola
Cessi, Paola
中科院分区:
地球科学2区
文献类型:
--
作者:
Jones, C. S.;Cessi, Paola

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北大西洋的表层盐度控制着经向翻转环流(MOC)下沉分支的位置;北大西洋的盐度较高,因此深水形成发生在那里,而不是北太平洋。结果表明,在一个由凹槽连接的两个不同宽度的盆地的三维原始方程模式中,即使在纬向均匀的地表强迫下,也有倾向于在狭窄的盆地中下沉。这种偏好与“下沉”盆地的速度场和盐度场的细节有关。与风生亚极涡旋相关的向南西边界流在宽流域比窄流域具有更高的流速。它淹没了与MOC有关的向北的西部边界流,导致宽盆地下沉,因此淡水从区域的最北端向南输送,在宽盆地的西部边界形成一个水池。淡水池抑制局部对流,向东扩散,导致宽盆北部盐度偏低,形成宽盆下沉。这一淡水池在狭小盆地下沉的狭窄盆地中不太明显,在那里,向北的MOC西部边界流克服了与风力驱动的亚极地涡旋相关的向南的西部边界流,将较低纬度的咸水带到北部,使深水团得以形成。
The surface salinity in the North Atlantic controls the position of the sinking branch of the meridional overturning circulation (MOC); the North Atlantic has higher salinity, so deep-water formation occurs there rather than in the North Pacific. Here, it is shown that in a 3D primitive equation model of two basins of different widths connected by a reentrant channel, there is a preference for sinking in the narrow basin even under zonally uniform surface forcing. This preference is linked to the details of the velocity and salinity fields in the “sinking” basin. The southward western boundary current associated with the wind-driven subpolar gyre has higher velocity in the wide basin than in the narrow basin. It overwhelms the northward western boundary current associated with the MOC for wide-basin sinking, so freshwater is brought from the far north of the domain southward and forms a pool on the western boundary in the wide basin. The fresh pool suppresses local convection and spreads eastward, leading to low salinities in the north of the wide basin for wide-basin sinking. This pool of freshwater is much less prominent in the narrow basin for narrow-basin sinking, where the northward MOC western boundary current overcomes the southward western boundary current associated with the wind-driven subpolar gyre, bringing salty water from lower latitudes northward and enabling deep-water mass formation.
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