Investigating the Roles of External Forcing and Ocean Circulation on the Atlantic Multidecadal SST Variability in a Large Ensemble Climate Model Hierarchy

نویسندگان

چکیده

Abstract This paper attempts to enhance our understanding of the causes Atlantic multidecadal variability (AMV). Following literature, we define AMV as SST averaged over North basin, linearly detrended and low-pass filtered. There is an ongoing debate about drivers AMV, which include internal generated from ocean or atmosphere (or both) external radiative forcing. We test role these factors in explaining time history, variance, spatial pattern using a 41-member ensemble fully coupled version CESM 10-member slab ocean. The large allows us isolate forcing versus variability, model differences allow circulation. Both with without circulation, explains more than half variance observed series, indicating its important simulating twentieth-century phases. In this net effect processes reduce AMV. Dynamical coupling also reduces ability simulate characteristic but has little impact on pattern. Historical improves history simulation, while realistic representation below that lowers correlation observations.

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ژورنال

عنوان ژورنال: Journal of Climate

سال: 2021

ISSN: ['1520-0442', '0894-8755']

DOI: https://doi.org/10.1175/jcli-d-20-0167.1