The upper, deep, abyssal and overturning circulation in the Atlantic Ocean at 30°S in 2003 and 2011

The upper, deep, abyssal and overturning circulation in the Atlantic Ocean at 30°S in 2003 and 2011
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2003年和2011年南纬30°大西洋上层、深层、深海和翻转环流

DOI:
10.1016/j.pocean.2019.102136
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发表时间:
2019
影响因子:
4.1
通讯作者:
Hernández-Guerra A
Hernández-Guerra A
中科院分区:
地球科学1区
文献类型:
--
作者:
Hernández-Guerra A

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利用GO-SHIP跨洋水文剖面的数据,并采用三个具有不同约束条件的反演模型,对2003年和2011年南纬30度大西洋温跃层、中层、深层和深海层的物质输运进行了估算。最上层包括南大西洋中央水(SACW)和南极中层水(AAIW),2003年和2011年向北净输送量分别为12.1 - 14.7 Sv和11.7 - 17.7 Sv,可以认为是经向翻转环流(MOC)向北返回的分支。2003年西边界巴西海流输送的SACW(− 20.2 ± 0.7 Sv)是2011年(− 9.7 ± 0.7 Sv)的两倍。由AAIW和上绕极深水(UCDW)组成的向极流在巴西海流下方流动。东部边界本格拉海流以高中尺度涡动活动为特征,2003年和2011年在沃尔维斯海岭以东输送15.6 ± 0.9 Sv和11.2 ± 0.8 Sv。在海洋内部,向北流动主要位于大西洋中脊(MAR)以东,在2003年和2011年观测到的阿古拉斯环(AR)将温暖和咸水从印度洋输送到大西洋。在深层,北大西洋深层水(NADW)向南输送以深层西边界流的形式出现,也出现在东部海盆。西部和东部盆地运输类似数量的NADW向南在这两年中,虽然东部的路径变化很大。NADW总输送量(也被视为MOC)在2003年为16.3 - 24.5 Sv,2011年为17.1 - 29.6 Sv,因此没有显著变化。
Mass transports for the thermocline, intermediate, deep and abyssal layers in the Atlantic Ocean, at 30°S and for 2003 and 2011, have been estimated using data from GO-SHIP hydrographic transoceanic sections and applying three inverse models with different constraints. The uppermost layers comprise South Atlantic Central Water (SACW) and Antarctic Intermediate Water (AAIW), with a net northward transport in the range of 12.1–14.7 Sv in 2003 and 11.7–17.7 Sv in 2011, which can be considered as the northward returning limb of the Meridional Overturning Circulation (MOC). The western boundary Brazil Current transports twice as much SACW in 2003 (−20.2 ± 0.7 Sv) than in 2011 (−9.7 ± 0.7 Sv). A poleward current consisting of AAIW and Upper Circumpolar Deep Water (UCDW) flows beneath the Brazil Current. The eastern boundary Benguela Current, characterized by a high mesoscale eddy activity, transports 15.6 ± 0.9 Sv in 2003 and 11.2 ± 0.8 Sv in 2011, east of the Walvis Ridge. In the ocean interior, the northward flow is mainly located east of the Mid Atlantic Ridge (MAR) where Agulhas Rings (ARs), observed in both 2003 and 2011, transport warm and salty water from the Indian to the Atlantic Ocean. For the deep layers, the southward transport of North Atlantic Deep Water (NADW) occurs as the Deep Western Boundary Current and also in the eastern basin. The western and eastern basins transport similar amounts of NADW to the south during both years, although the eastern pathway changes substantially between both years. The total NADW transport, which is also considered the MOC, is in the range 16.3–24.5 Sv in 2003 and 17.1–29.6 Sv in 2011, hence with no significant change.
逆盒模型中的加那利洋流和北赤道洋流
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发表时间: 2005
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发表时间: 1983
影响因子: 4.1
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发表时间: 1995
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DOI: --
发表时间: 1985
期刊:
影响因子: --
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DOI: 10.1357/002224002762688687
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影响因子: 0.5
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