Timescale‐dependent AMOC–AMO relationship in an earth system model of intermediate complexity,International Journal of Climatology

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Timescale‐dependent AMOC–AMO relationship in an earth system model of intermediate complexity
International Journal of Climatology ( IF 3.5 ) Pub Date : 2020-11-09 , DOI: 10.1002/joc.6926
Hyo‐Jeong Kim ₁ , Soon‐Il An ₁ , Daehyun Kim ₂

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The relationship between Atlantic multi‐decadal oscillation (AMO) and Atlantic meridional overturning circulation (AMOC) is examined with respect to two (inter‐ and multi‐decadal) different timescales using a long‐term unforced simulation of an earth system model of intermediate complexity. In the inter‐decadal timescale, the AMO and the AMOC establish a self‐sustaining oscillatory mode; the AMOC induces the positive AMO through meridional heat transport (MHT), but with the time delay of approximately 7 years as the AMOC anomalies propagate southward over time within the Atlantic basin. After then, the AMO reduces the density in the main sinking region and brings the negative phase of the AMOC, which results in the rest half of the cycle. On the other hand, in the multi‐decadal timescale, the AMO and the AMOC are almost in phase because the AMOC is spatially stationary, resulting in a pan‐Atlantic surface warming. In addition, the Arctic‐originated density fluctuations are required for the multi‐decadal AMOC to switch its phase. The results obtained in this study suggest that timescale dependency should be considered when investigating the AMOC–AMO relationship.

中文翻译：

中等复杂性地球系统模型中与时间标度有关的AMOC–AMO关系

使用中等复杂性地球系统模型的长期非强迫模拟，针对两个（年代际和年代际）不同的时间尺度，研究了大西洋多年代际振荡（AMO）和大西洋子午翻转环流（AMOC）之间的关系。在十年间的时间尺度上，AMO和AMOC建立了一种自我维持的振荡模式。AMOC通过子午热传输（MHT）诱发了积极的AMO，但由于AMOC异常随着时间的推移在大西洋盆地内向南传播，因此延迟了大约7年的时间。此后，AMO降低了主沉区的密度，并使AMOC变为负相，从而导致了循环的剩余一半。另一方面，在数十年的时间尺度上，AMO和AMOC几乎处于同相状态，因为AMOC在空间上是固定的，从而导致泛大西洋表面变暖。另外，多年代际AMOC转换其相位需要北极起源的密度波动。这项研究获得的结果表明，在调查AMOC-AMO关系时应考虑时标依赖性。

更新日期：2021-01-18

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