Johnston Draw

Johnson Draw is another intensive instrumented subwatershed (1.9 km2) with a focus on understanding slope/aspect relationships on climate, soils, and vegetation. Ten climate stations are situated every 50 meters in elevation on both north and south facing aspects. This data collection has resulted in one of the longest climate records documenting the rain to snow transition. This catchment hovers at freezing (0 degree C or 32 degree F) for 4 months of the year (Enslin et al. 2017). Variation in water year results in pronounced differences in the number of days of snow cover on the north compared to the south facing slopes. The catchment has also been used to understand the role of aspect and other topographic metrics such as slope and curvature, a measure of convexity or concavity of the surface, in controlling the distribution of soil carbon but also the thickness of the mobile regolith (Patton et al. in review).