Data and code for: Litzow, M. A., M. E. Hunsicker, N. A. Bond, B. J. Burke, C. Cunningham, J. L. Gosselin, E. L. Norton, E. J. Ward, and S. Zador. 2020. The changing physical and ecological meanings of North Pacific Ocean climate indices. Proc Natl Acad Sci USA April 7, 2020 117 (14) 7665-7671; https://doi.org/10.1073/pnas.1921266117