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TitleSupplementary data, code, and information for ‘Multidecadal climate oscillations during the past millennium driven by volcanic forcing’ (Science, Mann et al. 2021)
AbstractPast research argues for an internal multidecadal (40-60 year) oscillation distinct from climate noise. Recent studies have argued this so-termed Atlantic Multidecadal Oscillation (“AMO”) is instead a manifestation of competing time-varying effects of anthropogenic greenhouse gases and sulfate aerosols. That conclusion is bolstered by the absence of robust multidecadal climate oscillations in control simulations of current-generation models. Paleoclimate data, however, do demonstrate multidecadal oscillatory behavior during the pre-industrial era. Comparing control and forced “last millennium” simulations, we show that these apparent multidecadal oscillations are an artifact of pulses of volcanic activity during the pre-industrial era that project significantly onto the multidecadal (50-70 year) frequency band. We conclude that there is no compelling evidence for internal multidecadal oscillations in the climate system.
MetadataClick here for full metadata
Data DOIdoi:10.26208/rteb-wy44

Mann, M. E.
Penn State Department of Meteorology
Steinman, B. A.
Penn State Department of Meteorology
Brouillette, D. J.
Penn State Department of Meteorology
Miller, S. K.
Penn State Department of Meteorology

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Mann, M.E., Steinman, B.A., Brouillette, D.J., Miller, S.K., Multidecadal Climate Oscillations During the Past Millennium Driven by Volcanic Forcing, Science, 371, 1014–1019, 2021. DOI: 10.1126/science.abc5810