Impact model: SIMSTRAT-UoG

SimStrat-UoG is a modified version of the buoyancy-extended k- model Simstrat v1. In this diffusive model, an ice-snow routine was implemented. For global runs, lake specific parameterization was deactivated.

ISIMIP2b

Person responsible for model simulations in this simulation round

Marjorie Perroud: marjorie.perroud@alpiq.com, University of Geneva (Switzerland)

Additional persons involved: Marjorie Perroud

Output Data

Experiments: I, II, II, VIII
Climate Drivers: None
Date: 2019-12-09

Basic information

Model Version: Simstrat-UoG v.1

Model Output License: CC0

Reference Paper: Main Reference: Goudsmit G, Burchard H, Peeters F, Wüest A et al. Application of k‐ϵ turbulence models to enclosed basins: The role of internal seiches. Journal of Geophysical Research: Oceans,107,,2003

Reference Paper: Other References: Patterson J, Hamblin P et al. Thermal simulation of a lake with winter ice cover. Limnology and Oceanography,33,323-338,2010

Resolution

Spatial aggregation: regular grid

Horizontal resolution: 0.5°x0.5°

Temporal resolution of input data: climate variables: daily

Additional temporal resolution information: Daily atmospheric forcing was disaggregated to provide 3 hourly-data as input to the model. The model time step is one hour.

Input data

Simulated atmospheric climate data sets used: IPSL-CM5A-LR, HadGEM2-ES, GFDL-ESM2M, MIROC5

Observed atmospheric climate data sets used: EWEMBI

Climate variables: huss, sfcWind, tas, uas, rlds, vas, rsds, ps, pr

Spin-up

Was a spin-up performed?: Yes

Spin-up design: 30 years of spin-up (year 1661 repeted 30 times) were used to start the picontrol simulations. Historical simulations were started from the picontrol simulations (from 1861) and future simulations were started from historical simulations (thus no spin-up was needed after 1661).

Calibration

Was the model calibrated?: No

Methods

Snow melt: Ice-snow melt calculated as in Patterson and Hamblin (1988) and Hostetler (1991).

Additional questions 1

How did you initialise you lake temperature profile?: Lake temperature profile was initialized with a homogeneous 10°C profile.

How did you set lake depth?: Lake depth was based on a regridded Global Lake Data Base (GLDB; Kourzeneva, 2009);

How did you set water transparency?: Following empirical relation of extinction coefficient to lake depth by Hakanson (1995)