Declarations

Funding

The research was supported by UBACyT20020170100428BA, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) PIP 11220200102038CO, PICT-2020-SERIEA-I-INVI-00540, and the CLIMAX Project funded by Belmont Forum/ANR-15-JCL/-0002-01. Elio Campitelli was supported by a PhD grant from CONICET, Argentina.

Conflict of interest/Competing interests

The authors have no relevant financial or non-financial interests to disclose.

Ethics approval

Not applicable.

Availability of data and materials

All data used in this paper available in a Zenodo repository (Campitelli, Díaz, and Vera 2022b) (https://zenodo.org/record/6612429). Indices updated monthly and daily will be made available at http://www.cima.fcen.uba.ar/~elio.campitelli/shceof/.

It is also freely available from their respective sources:

ERA5 data can be obtained via the Copernicus Climate Data Store (https://cds.climate.copernicus.eu/cdsapp\#!/dataset/reanalysis-era5-pressure-levels-monthly-means\).
ERSSTv5 can be obtained via NOAA’s NCEI websiste at https://www.ncei.noaa.gov/access/metadata/landing-page/bin/iso?id=gov.noaa.ncdc:C00927
CMAP Precipitation data provided by the NOAA/OAR/ESRL PSL, Boulder, Colorado, USA, from their Web site at https://psl.noaa.gov/data/gridded/data.cmap.html.
The Oceanic Niño Index is available via NOAA’s Climate Prediction Center: https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/ensostuff/detrend.nino34.ascii.txt.
The Oceanic Niño Index is available via NOAA’s Climate Prediction Center: https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/ensostuff/detrend.nino34.ascii.txt.
The Dipole Mode Index is available via Global Climate Observing System Working Group on Surface Pressure: https://psl.noaa.gov/gcos_wgsp/Timeseries/Data/dmi.had.long.data

Code availability

A version-controlled repository of the code used to create this analysis, including the code used to download the data can be found at https://github.com/eliocamp/shceof.

Authors’ contributions

E.C. made the data curation, formal analysis and prepared all the figures. E.C. and L.D. wrote the main manuscript text. All authors reviewed the manuscript.

References

Campitelli, Elio, Leandro Díaz, and Carolina Vera. 2022b. “Data for "Revisiting the Austral Spring Extratropical Southern Hemisphere Zonally Asymmetric Circulation Using Complex Empirical Orthogonal Functions".” Zenodo. https://doi.org/10.5281/zenodo.6612324.