Acute Sensitivity of Global Ocean Circulation and Heat Content to Eddy Energy Dissipation Timescale
Acute Sensitivity of Global Ocean Circulation and Heat Content to Eddy Energy Dissipation Timescale
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DOI：
10.1029/2021gl097259
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发表时间：
2022-04
影响因子：
5.2
通讯作者：
J. Mak;David P. Marshall;G. Madec;J. Maddison
中科院分区：
文献类型：
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作者：
J. Mak;David P. Marshall;G. Madec;J. Maddison
全球海洋翻转环流严重依赖于全球密度分层，在调节气候演变中发挥着核心作用。虽然众所周知，全球分层剖面对南大洋动力学，特别是风和浮力强迫表现出强烈的依赖性，但我们在这里证明，分层对中尺度涡流能量耗散时间尺度也非常敏感。在具有能量约束中尺度涡流参数化的全球海洋环流模型的背景下，结果表明，涡流能量耗散时间尺度的适度变化会导致与海洋环流相关的关键指标在较长时间尺度上发生显着变化，即南极绕极流输送、大西洋经向翻转环流强度和全球海洋热含量。结果强调，需要限制与涡流能量耗散相关的不确定性，以用于百年时间尺度的气候模型预测以及千年时间尺度的古气候模拟。
The global ocean overturning circulation, critically dependent on the global density stratification, plays a central role in regulating climate evolution. While it is well known that the global stratification profile exhibits a strong dependence to Southern Ocean dynamics and in particular to wind and buoyancy forcing, we demonstrate here that the stratification is also acutely sensitive to the mesoscale eddy energy dissipation timescale. Within the context of a global ocean circulation model with an energy constrained mesoscale eddy parameterization, it is shown that modest variations in the eddy energy dissipation timescale lead to significant variations in key metrics relating to ocean circulation, namely the Antarctic Circumpolar Current transport, Atlantic Meridional Overturning Circulation strength, and global ocean heat content, over long timescales. The results highlight a need to constrain uncertainties associated with eddy energy dissipation for climate model projections over centennial timescales and also for paleoclimate simulations over millennial timescales.