Mesoscale perturbations control inter‐ocean exchange south of Africa

Mesoscale perturbations control inter‐ocean exchange south of Africa
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中尺度扰动控制非洲南部的海洋间交换

DOI:
10.1029/2008gl035132
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发表时间:
2008
影响因子:
5.2
通讯作者:
M. Scheinert
M. Scheinert
中科院分区:
地球科学1区
文献类型:
--
作者:
Biastoch;J. R. E. Lutjeharms;C. W. Böning;M. Scheinert

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从南印度洋到南大西洋的海洋间渗漏量的量化是衡量阿古拉系统在全球温盐环流中作用的一项重要措施。为了探讨中尺度变化(如阿古拉斯环和莫桑比克涡旋)在这一过程中的具体作用,建立了阿古拉斯区的一个高分辨率模式(基于NEMO-ORCA)。它嵌套在一个全局粗分辨率模型中。高分辨率的鸟巢捕捉到了大阿古拉斯地区的所有显著特征,包括沿非洲海岸的阿古拉海流和纳塔尔脉冲的上游扰动。对高分辨率Nest和粗分辨率Nest海洋间交换的比较表明,后者大大高估了流入大西洋的水量,表明需要显式模拟中尺度特征。排除上游扰动的敏感性实验表明,大洋之间的交换量没有差异。然而,阿古拉斯环及其进入南大西洋的漂移路径的真实表示取决于对这些上游扰动的模拟。
The quantification of inter‐ocean leakage from the South Indian to the South Atlantic Ocean is an important measure for the role of the Agulhas system in the global thermohaline circulation. To explore the specific role of mesoscale variability (such as Agulhas rings and Mozambique eddies) in this process a high‐resolution model (based on NEMO‐ORCA) for the Agulhas region has been set up. It is nested into a global coarse‐resolution model. The high‐resolution nest captures all salient features of the greater Agulhas region, including the upstream perturbations of the Agulhas Current and Natal Pulses along the African coast. A comparison of the inter‐ocean exchange in the high‐resolution nest with its coarse resolution counterpart reveals that the latter significantly over‐estimates the amount of water flowing into the Atlantic Ocean, demonstrating the need to explicitly simulate the mesoscale features. A sensitivity experiment that excludes the upstream perturbations revealed no difference in the amount of inter‐ocean exchange. However, the realistic representation of Agulhas rings and their drift path into the South Atlantic depends on the simulation of those upstream perturbations.
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DOI: --
发表时间: 2007
期刊:
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DOI: 10.1016/j.cageo.2007.01.009
发表时间: 2008-01-01
影响因子: 4.4
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DOI: 10.1029/jc093ic01p00631
发表时间: 1988
影响因子: --
作者:
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通讯作者: H. R. Roberts
DOI: --
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期刊: Science
影响因子: 56.9
作者:
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