Extended Data Fig. 1: Zonal wavenumber 3 in reanalysis and models. | Nature Geoscience

Extended Data Fig. 1: Zonal wavenumber 3 in reanalysis and models.

From: Zonal wave 3 pattern in the Southern Hemisphere generated by tropical convection

Extended Data Fig. 1

Fourier filtered zonal wavenumber 3 in a) reanalysis (ERA-Interim) and b) model control (CTRL). Panel c) shows the comparison between three reanalysis (ERA-Interim, ERA-5 and NCEP-NCAR) products and different Atmospheric Model Intercomparison Project (AMIP) model simulations on their ability to represent the ZW3 pattern in the SH extratropics and panel d) shows the comparison between d) different coupled model simulations from the Coupled Model Intercomparison Project 5 (CMIP5). 30-year long simulations from 1979-2008 are considered from all three reanalysis and for AMIP simulations from CMIP models. 100-year long simulations are used for coupled pre-industrial control simulations from CMIP models Fourier transforms are used to calculate the amplitude and the phase (location of the first maximum) of the climatological mean ZW3 pattern. Bias is calculated by subtracting the mean amplitude and phase of reanalysis and modelled ZW3 from the ZW3 obtained from ERA-Interim reanalysis. CESM is marked as black star.

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