Impact model: GOTM

The General Ocean Turbulence Model (GOTM) was used for simulating the thermal dynamics of 17357 lakes (pixels). GOTM is an open-source ocean model adapted to lakes, which assumes a one-dimensional water column model for studying hydrodynamic and biogeochemical processes in marine and limnic waters. It models the state-of-the-art of the main physical processes in lakes: vertical turbulent fluxes of momentum, heat, and dissolved and particulate matter.

Sector
Lakes (global)
Region
global
Contact Person

Information for the model GOTM is provided for the simulation rounds shown in the tabs below. Click on the appropriate tab to get the information for the simulation round you are interested in.

Basic information
Model Version: GOTM v5.3
Model output license: CC BY 4.0
Model Homepage: https://gotm.net
Model License: https://gotm.net
Simulation Round Specific Description: Atmospheric modeling forcing: IPSL-CM5A-LR Scenarios: historical, piControl, rcp26, rcp60, rcp85
Output Data
Experiments: II, III, VIII (only historical and future periods, partial data)
Climate Drivers: IPSL-CM5A-LR, GFDL-ESM2M, MIROC5
Date: 2020-06-22
Resolution
Spatial Aggregation: regular grid
Spatial Resolution: 0.5°x0.5°
Temporal Resolution Of Input Data: Climate Variables: daily
Input data sets used
Simulated Atmospheric Climate Data Sets Used: IPSL-CM5A-LR, HadGEM2-ES, GFDL-ESM2M, MIROC5
Observed Atmospheric Climate Data Sets Used: EWEMBI
Climate Variables: hurs, sfcWind, tasmax, tas, tasmin, uas, rlds, vas, rsds, ps, pr
Spin-up
Was A Spin-Up Performed?: Yes
Spin-Up Design: The first year of the simulation outputs should be taken as spin-up period.
Additional questions 1
How did you initialise you lake temperature profile?: The initial temperature conditions were configured as 8 and 6ºC at 1m and 50m depths, except for the tropical pixels (-30 to 30º latitude) with more than 10m depth, due to the unreal low temperatures presented in these particular lakes (thermal inertia issue, even after the one-year spin-up), then a re-run was implemented using temperatures initial values of 25 and 23ºC at 1m and 50m depths.
How did you set lake depth?: The model was run with a fixed water level at 0m and the number of layers been simulated are equal to the total depth of the lake (pixel). Although, there are different lake depths only 10 layers were saved in the NetCDF outputs, according to this exponential funcions: Lake depth -> layers saved depth <=10m -> 1-10 meters 10 1-9, 15 meters 15 1-5, 7, 9, 12, 15, 20 meters 20 1-5, 7, 9, 12, 20, 30 meters 30 1-5, 7, 9, 12, 30, 50 meters 50 1-3, 5, 7, 9, 15, 27, 50 , 100 meters depth > 100 -> 1-3, 5, 7, 9, 15, 27, 100 , 1000 meters
How did you set water transparency?: Light extinction methods based on non-visible fraction of shortwave radiation and e-folding depth of non-visible shortwave radiation