Fig. 7: Forest plot from the meta-analysis of the relationship between moisture and the thermal offset (TO), with results grouped by soil type and polar region.
From: Divergent controls on surface and thermal offsets in permafrost across the three poles
The total sample size shown in the forest plot includes only samples from groups defined by region and soil texture for which a valid regression of moisture variables (total precipitation and volumetric soil water at four depths) on TO could be performed, excluding those with missing data or insufficient variation. Grey squares indicate the effect size (slope) for individual studies, with horizontal lines representing the 95% confidence intervals (CI). The size of each square is proportional to that study’s weight in the meta-analysis. The blue diamond represents the pooled summary effect and 95% CI for each soil-region subgroup and the overall analysis. The vertical dashed line at zero represents the line of no effect. The red horizontal bar shows the 95% prediction interval for the overall summary effect. Heterogeneity statistics (I² and p-value) are provided for each subgroup.
