Impact model: CLASSIC

This entry contains only the sector-specific information regarding the contribution to the global water sector. The main documentation can be found in the entry on biomes for CLASSIC: (https://www.isimip.org/impactmodels/details/306/)

The Canadian Land Surface Scheme Including Biogeochemical Cycles (CLASSIC) simulates the exchanges of energy, water, carbon, and momentum at the earth's surface. CLASSIC is formed by the coupling of the Canadian Land Surface Scheme (CLASS) and the Canadian Terrestrial Ecosystem Model (CTEM). CLASS simulates the fluxes of energy, water, and momentum. CTEM simulates biogeochemical cycles including fluxes of carbon.

ISIMIP3b
ISIMIP3a

Person responsible for model simulations in this simulation round

Sian Kou-Giesbrecht: sian_kou-giesbrecht@sfu.ca, 0000-0002-4086-0561, Simon Fraser University (Canada)

Basic information

Model Version: v1.0

Reference Paper: Other References: Joe R. Melton, Vivek K. Arora, Eduard Wisernig-Cojoc, Christian Seiler, Matthew Fortier, Ed Chan, and Lina Teckentrup et al. CLASSIC v1.0: the open-source community successor to the Canadian Land Surface Scheme (CLASS) and the Canadian Terrestrial Ecosystem Model (CTEM) – Part 1: Model framework and site-level performance. Geoscientific Model Development,13,2825–2850,2020

Resolution

Vertically resolved: No

Calibration

Was the model calibrated?: No

Vegetation

Is co2 fertilisation accounted for?: No

Person responsible for model simulations in this simulation round

Sian Kou-Giesbrecht: sian_kou-giesbrecht@sfu.ca, 0000-0002-4086-0561, Simon Fraser University (Canada)

Basic information

Model Version: v1.0

Model Homepage: https://cccma.gitlab.io/classic/

Resolution

Vertically resolved: No

Technological Progress

Technological progress: No

Soil

Soil layers: There are 20 soil layers starting with 10 soil layers of 0.1 m thickness, gradually increasing to a 30 m thick soil layer for a total ground depth of over 61 m.

Routing

Runoff routing: Runoff is not routed

Routing data: Runoff is not routed

Land Use

Land-use change effects: Implicit land-use change effects arise from the conversion of natural ecosystems to agricultural ecosystems.

Dams & Reservoirs

Dam and reservoir implementation: Dams and reservoirs are not implemented

Calibration

Was the model calibrated?: No

Which years were used for calibration?: NA

Which dataset was used for calibration?: NA

How many catchments were callibrated?: NA

Vegetation

Is co2 fertilisation accounted for?: Yes

How is vegetation represented?: The photosynthesis parametrization is based upon the approach of Farquhar et al. (1980) and Collatz et al. (1991, 1992) as described in Melton and Arora (2016). The gross leaf photosynthesis rate depends upon the maximum assimilation rate allowed by light, Rubisco, and transport capacity, and is dependent on the partial pressure of CO2 in the leaf interior.

Methods

Potential evapotranspiration: Total evapotranspiration is comprised of soil evaporation, evaporation of intercepted water and sublimation of intercepted snow from the canopy and plant transpiration. See Sun and Verseghy (2019).

Snow melt: The energy balance of the snowpack is solved iteratively for surface temperature taking into account, incoming short and longwave radiation, a varying snow albedo and density, sensible and latent heat exchanges, and the ground heat flux. If the surface temperature is simulated to be above freezing, the surface temperature is reset to 0°C and the excess energy applied to melting snow. See Brown et al. (2006).