Fig. 6: Forest plot from the meta-analysis examining the relationship between snow variables and the surface offset (SO), with results grouped by vegetation type and polar region.
From: Divergent controls on surface and thermal offsets in permafrost across the three poles
The total sample size displayed in the forest plot represents only the samples from region-vegetation type combinations where a valid regression of snow-related variables (snow depth, density, and cover) on SO could be performed, excluding samples with missing data or insufficient variation within their group. Grey squares indicate the effect size (slope) from 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 shows the pooled summary effect and 95% CI for each vegetation-region subgroup and the overall meta-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.
