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<p>The Atlantic meridional overturning circulation (AMOC), a critical component of the global thermohaline circulation, governs meridional heat transport, and connects the sea surface and deep Atlantic. Yet, its dynamical role in the Atlantic multidecadal variability (AMV) and Deep atlantic multidecadal variability (DAMV) remains elusive. We identify a statistically robust coupling between AMV and DAMV, and such coupling supports the interpretation of DAMV as a deep-ocean symbiotic fingerprint of AMV. We further reveal an asymmetric temporal loop: DAMV leads AMV by approximately 1&#xa0;decade but lags it by 2 to 3&#xa0;decades, which could be served as deep-ocean connection between AMV phase transition in spatial pattern. This delayed interaction mirrors AMOC-driven ocean heat transport (OHT), particularly the temperature-induced OHT. Our findings demonstrate that AMV and DAMV form a delayed coupled vertical system for the first time, underscoring the importance of deep-ocean dynamics for improving coupled climate prediction on decadal timescales.</p>

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DAMV: a symbiotic fingerprint of AMV unveiled from the deep Atlantic

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Jiajun Yang,
  • Jianping Li,
  • Qirong An,
  • Leon Hermanson

摘要

The Atlantic meridional overturning circulation (AMOC), a critical component of the global thermohaline circulation, governs meridional heat transport, and connects the sea surface and deep Atlantic. Yet, its dynamical role in the Atlantic multidecadal variability (AMV) and Deep atlantic multidecadal variability (DAMV) remains elusive. We identify a statistically robust coupling between AMV and DAMV, and such coupling supports the interpretation of DAMV as a deep-ocean symbiotic fingerprint of AMV. We further reveal an asymmetric temporal loop: DAMV leads AMV by approximately 1 decade but lags it by 2 to 3 decades, which could be served as deep-ocean connection between AMV phase transition in spatial pattern. This delayed interaction mirrors AMOC-driven ocean heat transport (OHT), particularly the temperature-induced OHT. Our findings demonstrate that AMV and DAMV form a delayed coupled vertical system for the first time, underscoring the importance of deep-ocean dynamics for improving coupled climate prediction on decadal timescales.