Attributing Variability in Atlantic Meridional Overturning to Wind and Buoyancy Forcing
Attributing Variability in Atlantic Meridional Overturning to Wind and Buoyancy Forcing
复制标题
将大西洋经向翻转的变化归因于风和浮力强迫
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
H. Johnson
中科院分区：
文献类型：
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作者：
D. Marshall;H. Pillar;P. Heimbach;H. Johnson
一个伴随模式被用来将大西洋子午线翻转环流(AMOC)的变化归因于过去15年的风和浮力强迫。局地风的强迫激发了±5Sv的AMOC变率。相反，亚极地北大西洋的热通量激发了类似幅度的年际到年代际AOC变率，淡水通量起到了很小的作用。当解释过去强迫的时间窗增加到15年时，重建的AMOC变率的大小并不收敛。超过这一点，线性假设可能会被推翻，这表明并不是所有观测到的AMOC变化都可以以线性的方式归因于地表强迫。然而，重建的大气环流变率与26.5◦N的快速观测大体一致，特别是在以风强迫为主的时期。
An adjoint model is used to attribute variability in the Atlantic Meridional Overturning Circulation (AMOC) to wind and buoyancy forcing over the preceding 15 years. AMOC variability of magnitude ±5 Sv is excited by local wind forcing. In contrast, interannual to decadal AMOC variability of similar amplitude is excited by heat fluxes in the subpolar North Atlantic, with freshwater fluxes playing a very minor role. The magnitude of the reconstructed AMOC variability does not converge as the time window over which past forcing is accounted for is increased to 15 years. Beyond this point the assumption of linearity may break down, suggesting not all of the observed AMOC variability can be attributed in a linear manner to surface forcing. Nevertheless, the reconstructed AMOC variability is broadly consistent with RAPID observations at 26.5◦N, especially in periods dominated by wind forcing.
经向环流异常沿西部和东部边界的传播
影响因子：
3.5
作者：
Marshall D
通讯作者：
Marshall D