Impact model: CLASSIC-PEAT

CLASSIC-PEAT is a peatland-enabled version of CLASSIC (CLASS+CTEM) that represents peatland hydrology and carbon cycling and outputs peat-specific variables (e.g., peat soil carbon, peat depth, water-table related diagnostics) together with standard ecosystem carbon and energy fluxes.The model is applied here at global scale following the ISIMIP3a protocol and conventions.

ISIMIP3b
ISIMIP3a

Person responsible for model simulations in this simulation round

Zhiguang Chen: ZhiguangChen@cunet.carleton.ca, 0000-0002-5427-1266, Carleton University (Canada)

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

Basic information

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

Resolution

Spatial aggregation: variable grid

Temporal resolution of input data: co2: annual

Temporal resolution of input data: land use/land cover: annual

Temporal resolution of input data: soil: constant

Input data

Simulated atmospheric climate data sets used: MRI-ESM2-0, IPSL-CM6A-LR, MPI-ESM1-2-HR, UKESM1-0-LL, GFDL-ESM4

Additional input data sets: Atmospheric CH4 concentration from input4MIPs (https://doi.org/10.22033/ESGF/input4MIPs.1118).

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

Spin-up

Was a spin-up performed?: Yes

Spin-up design: The spin-up was 650 years. It used pre-industrial climate and atmospheric CO2 concentration at 1850 levels. For histsoc, DHF were fixed at 1850 levels. For 2015soc, DHF were fixed at 2015 levels.

Natural Vegetation

Natural vegetation partition: Land cover is from the European Space Agency (ESA) Climate Change Initiative (CCI), see https://doi.org/10.5194/essd-10-219-2018.

Natural vegetation dynamics: NA

Natural vegetation cover dataset: https://doi.org/10.5194/essd-10-219-2018

Management & Adaptation Measures

Management: NA

MODEL OUTPUT SPECIFICATIONS

How to calculate global annual total outputs: Global annual total output is calculated by multiplying the file by cellarea and by landfrac (divided by 100).

Person responsible for model simulations in this simulation round

Zhiguang Chen: ZhiguangChen@cunet.carleton.ca, 0000-0002-5427-1266, Carleton University (Canada)

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

Basic information

Model Version: CLASSIC v1.5

Model Homepage: https://gitlab.com/jormelton/classic

Model License: CLASSIC is distributed under the [Open Government License - Canada version 2.0](https://open.canada.ca/en/open-government-licence-canada)

Reference Paper: Main Reference: Melton J, Arora V, Wisernig-Cojoc E, Seiler C, Fortier M, Chan E, Teckentrup L 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

Spatial aggregation: regular grid

Horizontal resolution: 1° x 1°

Vertically resolved: Yes

Number of vertical layers: 20 soil layers

Temporal resolution of input data: climate variables: 6 hourly

Temporal resolution of input data: co2: annual

Temporal resolution of input data: land use/land cover: annual

Temporal resolution of input data: soil: constant

Input data

Observed atmospheric climate data sets used: GSWP3-W5E5 (ISIMIP3a)

Additional input data sets: Atmospheric CH4 concentration from input4MIPs (https://doi.org/10.22033/ESGF/input4MIPs.1118).

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

Spin-up

Was a spin-up performed?: Yes

Spin-up design: Spin-up was conducted using spinclim forcing for 1800–1900 until equilibrium was achieved. To avoid excessive peat loss (i.e., peatland burn-out) during spin-up, static peat depth was prescribed for this phase. Atmospheric CO₂ was fixed at the 1850 level. A final (last) spin-up was then performed using spinclim forcing for 1850–1900, with CO₂ concentrations set to the corresponding annual values, to better align model states with early historical conditions.

Natural Vegetation

Natural vegetation partition: Land cover was taken from the European Space Agency (ESA) Climate Change Initiative (CCI) dataset (doi:10.5194/essd-10-219-2018). The 1900 land-cover map was used, and the fractional area of croplands was redistributed to other PFTs to exclude anthropogenic crop effects.

Natural vegetation cover dataset: Land cover is from the European Space Agency (ESA) Climate Change Initiative (CCI), see https://doi.org/10.5194/essd-10-219-2018.

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.

Management & Adaptation Measures

Management: dynamic peat