Warming and snow loss increase reliance on old groundwater in a Colorado River headwater

Siirila-Woodburn, E., Thiros, N., Newcomer, M., Rudisill, W., Dennedy-Frank, P., Feldman, D., Sprenger, M., Carroll, R. W., Williams, K. H., Brodie, E. (2026). Warming and snow loss increase reliance on old groundwater in a Colorado River headwater, Nature Geoscience, 19, 549-555, https://doi.org/10.1038/s41561-026-01945-y