Lund University Global Drought Dataset (LUGD), 1981–2025: Weekly 0.1° saSPEI with Accumulation Timescales from 1 Week to 48 Months – 90N-45N

作者：Hongxiao Jin, David Wårlind, Zheng Duan, Paul Miller, Alexandra Pongrácz · 发表于：Zenodo (CERN European Organization for Nuclear Research) · 年份：2026 · DOI：10.5281/zenodo.21810473 · 研究领域：Environmental science、Climatology、Atmospheric sciences、Meteorology

Dataset description This dataset provides a snow-adjusted Standardized Precipitation Evapotranspiration Index (saSPEI) for northern terrestrial areas between 45° N and 90° N. The dataset is provided on a regular 0.1° latitude–longitude grid, at nominal weekly step (four nominal time steps per month), for the period 1981–2025. Twelve accumulation timescales are included: 1 and 2 weeks, and 1, 2, 3, 6, 9, 12, 18, 24, 36, and 48 months. A corresponding conventional SPEI dataset, generated using the same meteorological forcing, spatial grid, temporal calendar, calibration period, accumulation procedure, probability distribution, and temporal alignment, is available separately at https://zenodo.org/records/18985819. The two products can therefore be compared directly to quantify the effects of explicitly accounting for seasonal snow storage and release. Purpose and conceptual framework Conventional SPEI is calculated from the climatic water balance between precipitation and potential evapotranspiration. In cold regions, however, a substantial fraction of precipitation may fall as snow and remain stored in the snowpack for days to months before becoming available at the land surface. Treating snowfall as immediately available water can therefore misrepresent the timing and magnitude of climatic water availability. The saSPEI addresses this limitation by replacing total precipitation with the effective liquid-water flux released from the snow–rain system. The snow-adjusted climatic ...