LTER network Toolik Field Station MBLhome page

Weather at Toolik

Toolik Weather Graphs

Arctic LTER Weather Stations

Toolik Webcam

Animated Gif of yesterday's Webcam

Arctic LTER Inhouse login

Modeling has been use since the start of the Arctic LTER.

  • The Marine Biological Laboratory General Ecosystem Model (MBL-GEM) is a process-based model of C-N interactions in terrestrial ecosystems. The model is intended to be generally applicable to most terrestrial ecosystems and, in its original form, has been used to analyze the responses of temperate deciduous forests, tropical evergreen forests, and arctic tundra to changes in CO2 concentration, temperature, N inputs, irradiance, and soil moisture.
  • The Multiple Element Limitation (MEL) model is a quantitative synthesis of the Mooney-Bloom-Chapin Resource-Optimization hypothesis of plant nutrition (Mooney 1972, Bloom et al. 1985, Chapin et al 1987; also called the "functional equilibrium hypothesis," Farrar and Jones 2000) within a whole-ecosystem context (Rastetter et al. 1997a). The resource-optimization hypothesis predicts how plants should allocate their internal assets (biomass, proteins, carbohydrate...) to acquire resources from the environment (CO2, NH4, NO3, water, light...).
  • The Soil-Plant-Atmosphere model (SPA) is a detailed sub-diurnal model of canopy-atmosphere interactions, linking a radiative transfer scheme, a biochemical model of photosynthesis, CO2 diffusion, and a hydraulic model of stomatal opening  The Aggregated Canopy Model (ACM) is directly derived from SPA, but operates on a daily, rather than 30 minute, time-step and at the whole canopy, rather than leaf, level. ACM has been used to access the patterns of gross primary production in the Kuparuk River basin.
  • The hydrology/soil processes/nutrient flux model being developed by Kling, Stieglitz, and Giblin, specifically link the different parts of the ecosystem.

Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.