Winterlog: a five-winter thermal and hydrologic sensor record of coarse woody material, soils, and micro-meteorology, Second College Grant, New Hampshire, USA (2020-2025)

Data and analysis code accompanying the manuscript “Snowpack decouples thermal and hydrologic regimes of coarse woody material from the winter atmosphere in northern hardwood forests” (submitted to Agricultural and Forest Meteorology). This archive contains high-frequency temperature and moisture measurements from downed sugar maple (Acer saccharum) logs, adjacent mineral soils, and co-located micro-meteorological stations across five winters (2020–21 through 2024–25) at Dartmouth College's Second College Grant, Coos County, New Hampshire, USA (~44.886° N, −71.127° W; ~485 m a.s.l.). The site is the Northeastern installation of the Adaptive Silviculture for Climate Change (ASCC) network. Contents. Zenodo stores files as a flat list, so the original folders appear as filename prefixes: data_* holds the daily analysis-ready log record and the harmonized NOAA GHCN-Daily snow/precipitation series; code_* holds the R pipeline (code_run_all.R plus nine analysis and figure scripts). README.md and DATA_DICTIONARY.md document the columns and the reproduction steps. Scope. To protect the integrity of the ongoing long-term ASCC experiment, this archive is limited to the three logs monitored year-round (closed-canopy matrix, 0.1-ha gap, 0.4-ha gap) and the variables analyzed in the paper. The full 12-log growing-season network and raw logger files are not included. Raw NOAA Global Historical Climatology Network-Daily records are publicly available from the NOAA National Centers for Environmental Information. Reproduction. Requires R ≥ 4.2 with tidyverse, data.table, lubridate, mgcv, segmented, nlme, zoo, patchwork, and ggrepel. Restore the folder layout described in the README, edit PROJECT_DIR at the top of run_all.R, then source it. TDR interpretation. Probes carry a manufacturer calibration, not a wood-specific one. Because the dielectric permittivity of ice is far lower than that of liquid water, sub-zero declines in apparent volumetric water content reflect loss of liquid water (phase change), not physical drying.