Climate models overestimate the spatial footprint of extratropical marine heat waves

Replication Data and Code for: "Climate models overestimate the spatial footprint of extratropical marine heat waves" Overview This archive contains the processed data products and Python scripts used to reproduce the main-text and Extended Data figures for the manuscript "Climate models overestimate the spatial footprint of extratropical marine heat waves" (Ma et al.). Scientific Context These materials support the analysis showing that standard-resolution climate models overestimate the spatial scales of extratropical marine heat waves relative to observations, and that higher-resolution simulations better represent the fragmented spatial structure associated with mesoscale variability. Contents of this Archive Processed spatial metrics:NetCDF files containing decorrelation-length products for NOAA OISST observations and CESM1.3 simulations, including pre-industrial control and future-climate experiments. Event and connectivity metrics:CSV and NetCDF products used in the analysis of representative marine heatwave days, including yearly ranked events and largest connected-component areas identified using 4-neighbour connectivity. Figure-generation scripts:Python plotting scripts required to reproduce Figure 1, Figure 2, and Extended Data Figures 1–4. Analysis workflow scripts:Python processing scripts documenting the procedures used to detect Hobday-style marine heatwave conditions from daily SST and threshold fields, identify yearly representative events, and rebuild LR threshold/mask coordinates where needed. Data availability note This archive contains processed data products and analysis code required to reproduce the archived figures and intermediate manuscript results. Raw daily SST fields from the CESM1.3 simulations and the original daily OISST v2.1 fields are not included in this release because of archive-size limitations. Users wishing to rerun preprocessing steps from raw daily data should obtain those source datasets separately and provide local file paths as described in the README.