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Southern Annular Mode (SAM) Paleoclimate Data Assimilation

This repository contains just the code used to assimilate the Southern Annular Mode index over the Common Era from King et al. (2022). For the complete repository, which includes the external or ancillary code for doing the assimilation as well as the input and output data files and the final reconstruction (approximately 8GB), please visit the complete Zenodo repository here.

Citation

King, J., K.J. Anchukaitis, K. Allen, T. Vance, A. Hessl, Trends and variability in the Southern Annular Mode during the Common Era, Nature Communications, 14, 2324, doi:10.1038/s41467-023-37643-1, 2023.

Contents

This repository holds just the code used to implement the analyses and figures in the paper, not including the DASH core and PDSI proxy systems model. For the complete code and data, which includes the NetCDF files of the input and output, please see the Zenodo directory here. The Analysis folder in this repository contains the code used to implement the analyses, but not the intermediate output files produced by the code. Please visit the complete Zenodo repository here for input data, intermediate files, output, and external supporting programs including the version of DASH used in this paper.

Code Dependencies

You will need Matlab 2020b or higher to run the code.

Several of the folders rely on code or output files from other folders in the repository. Specifically:

  • Several of the sections in the Analysis folder rely on raw data in the Input Data folder. You can find additional details in the runAnalysis.m script in the Analysis folder.

  • All of the functions in the Figures and Tables folder rely on output files located in the Analysis folder. Thus, you will need to download the Analysis folder to reproduce the figures. Additional details can be found in the figuresAndTables.m script in the Figures and Tables folder.

  • Once again, for the complete code and data, which includes the NetCDF files of the input and output, please see the Zenodo directory here.