These results are from the Biome-BGC model . These simulations used about 900 meteorological observation stations and a current vegetation distribution map as input. Output was generated on a grid with 2km resolution.
Regional topography is shown by the grey-shaded background.
By mid-spring, with warming temperatures, PSN is increasing in both evergreen and deciduous vegetation types. Snowmelt results in moist soils through the late spring and early summer, when PSN rates are at their highest. By mid-summer, the onset of drought can be detected, as PSN rates decline, especially at the lower elevations that receive less precipitation and have smaller snowpacks. By late summer most of the region is under some degree of drought stress, with periodic and short-lived relief from summer rainstorms.