Blue-ring and ring-width data from bristlecone pine (Pinus longaeva), White Mountains, California (900–2014 CE)

This dataset supports the manuscript “A 1100-Year Blue-Ring Record Reveals Sub-Annual Cooling Events Hidden in Tree-Ring Width Chronologies” accepted by Geophysical Research Letters (2025). The dataset contains ring-width (RW) and blue-ring (BR) data derived from bristlecone pine (Pinus longaeva) sampled in the White Mountains, California (USA). Measurements span the period 900–2014 CE and were used to construct the 1100-year BR chronology described in the paper. Data description:• RW: Ring-width measurements in micrometres (µm); value 0 = missing ring; null = broken/missing/undatable section.• FR type: information colour-coded, please refer to README• BR type: information colour-coded, please refer to README File format: Microsoft Excel (.xlsx) License: CC BY-NC 4.0 International (Creative Commons Attribution–NonCommercial). For questions about data usage or interpretation, please contact the corresponding author ([e-mail]).