Hemispheric Differences in Eddy–Jet Relationships under Arctic and Antarctic Sea-Ice–SST Perturbations

Abstract

This repository contains the data products, statistical outputs, analysis scripts, plotting scripts, file-verification information, and software-environment records supporting the study “Hemispheric differences in eddy–jet relationships under Arctic and Antarctic sea-ice–SST perturbations.”The study uses large-ensemble PAMIP experiments from HadGEM3-GC31-MM and IPSL-CM6A-LR, with 100 members for each baseline and prescribed polar sea-ice–SST perturbation experiment. The main analyses compare Northern Hemisphere JJA and Southern Hemisphere DJF responses and diagnose approximately 2–8-day transient eddy kinetic energy (EKE), eddy momentum-flux convergence (EMFC), poleward eddy heat flux, jet latitude, storm-track–jet geometry, and the cross-experiment retention of baseline EMFC–jet relationships.The archive includes locked member inventories, SHA-256 verification information, polar boundary-state diagnostics, member-level derived metrics, statistical summary tables, reproducible analysis and figure-generation scripts, and software-environment information used for the final manuscript results. It is intended to support reproducibility of the reported ensemble-mean responses, hemispheric contrasts, sensitivity analyses, cross-experiment regression tests, and short-lag correspondence diagnostics.The original PAMIP model output is publicly available through the Earth System Grid Federation (ESGF) and is therefore not redistributed in this repository. Users should obtain the original HadGEM3-GC31-MM and IPSL-CM6A-LR PAMIP files directly from ESGF when full reconstruction from the raw model output is required.The repository should be cited together with the associated research article when the archived data products or code are reused.