The coupled reanalysis global meridional overturning circulation imprinted by historic volcanic eruptions

作者：Yingjing Jiang, Shaoqing Zhang, Yang Gao, Lixin Wu, Lu Ls, Zikuan Lin, Wenju Cai, Deliang Chen, L. Ruby Leung, Bin Wang, Xueshun Shen, Mingkui Li, Xiaolin Yu, Xiaopei Lin · 发表于：Nature Communications · 年份：2026 · DOI：10.1038/s41467-026-75651-z · 研究领域：Oceanographic and Atmospheric Processes、Climate variability and models、Geology and Paleoclimatology Research

The global ocean meridional overturning circulation (GMOC) is central for ocean transport and climate variations. However, a comprehensive picture of its historical mean state and variability remains vague due to limitations in modelling and observing systems. Incorporating observations into models offers a viable approach to reconstructing climate history, yet achieving coherent estimates of GMOC has proven challenging due to difficulties in harmonizing ocean stratification. Here, we demonstrate that multiscale data assimilation that integrates atmospheric and oceanic observations into two coupled models in a dynamically consistent way robustly retrieves the past 80-year GMOC. By diagnosing volcanic eruption-induced North Atlantic cooling and surface buoyancy loss, we show historic volcanic eruption events are imprinted in variability of the rebuilt GMOC. The Mt. Pinatubo (1991) volcanic eruption produces a multidecadal characteristic of the overturning evolution by the chain of enhancing diapycnal mixing - strengthening deep convection - mediated by eddy activities.