Coupling of the mid-depth and abyssal components of the global overturning circulation according to a state estimate

Coupling of the mid-depth and abyssal components of the global overturning circulation according to a state estimate
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根据状态估计耦合全球翻转环流的中深度和深海分量

DOI:
10.1126/sciadv.abf5478
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发表时间:
2021
期刊:
影响因子:
13.6
通讯作者:
Forget, Gael
Forget, Gael
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Rousselet, Louise;Cessi, Paola;Forget, Gael

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利用状态估计的速度,拉格朗日分析绘制了北大西洋深水(NADW)离开大西洋并重新进入大西洋经向翻转环流(AMOC)上分支的全球路线。8100年来的虚拟粒子轨迹突出了一条上路线(32%)和一条下路线(68%)。后者样品σ2> 37.07,进一步分为亚极地(20%)和深海细胞(48%)。深海单元中的颗粒在南大洋上涌之前,会迂回进入北太平洋深海。NADW优先在33°S以北上升(67%)。总diapycnal转换是最大的在较低的路线,但相当的幅度在较高的路线,挑战其先前的表征为“绝热”。典型的过境时间分别为300年,700年和3600年的上层路线,副极地和深海细胞。AMOC将盐度输入大西洋,表明其对高纬度淡水扰动的潜在不稳定性。
Using velocities from a state estimate, Lagrangian analysis maps the global routes of North Atlantic Deep Water (NADW) exiting the Atlantic and reentering the upper branch of the Atlantic Meridional Overturning Circulation (AMOC). Virtual particle trajectories followed for 8100 years highlight an upper route (32%) and a lower route (68%). The latter samples σ2> 37.07 and is further divided into subpolar (20%) and abyssal cells (48%). Particles in the abyssal cell detour into the abyssal North Pacific before upwelling in the Southern Ocean. NADW preferentially upwells north of 33°S (67%). Total diapycnal transformations are largest in the lower route but of comparable magnitudes in the upper route, challenging its previous characterization as “adiabatic.” Typical transit times are 300, 700, and 3600 years for the upper route, subpolar, and abyssal cells, respectively. The AMOC imports salinity into the Atlantic, indicating its potential instability to high-latitude freshwater perturbations.
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