Impact model: SSiB4/TRIFFID-Fire

ISIMIP3a

Person responsible for model simulations in this simulation round

Huilin Huang: huilin.huang@pnnl.gov, 0000-0002-7328-6738, PNNL (USA)

Output Data

Experiments: (*) counterclim_histsoc_default, obsclim_histsoc_1901co2, obsclim_1901soc_default, obsclim_histsoc_default, obsclim_histsoc_nofire
Climate Drivers: GSWP3-W5E5
Date: 2023-03-09

Basic information

Model Homepage: https://github.com/hhllbao93/SSiB4-TRIFFID-Fire

Reference Paper: Main Reference: Huilin Huang, Yongkang Xue, Fang Li, and Ye Liu et al. Modeling long-term fire impact on ecosystem characteristics and surface energy using a process-based vegetation–fire model SSiB4/TRIFFID-Fire v1.0. Geosci. Model Dev.,13,6029–6050,2020

Reference Paper: Other References: Huilin Huang, Yongkang Xue, Ye Liu, Fang Li, and Gregory S. Okin et al. Modeling the short-term fire effects on vegetation dynamics and surface energy in southern Africa using the improved SSiB4/TRIFFID-Fire model. Geosci. Model Dev.,None,,2021

Resolution

Spatial aggregation: regular grid

Horizontal resolution: 0.5’ x 0.5’

Temporal resolution of input data: climate variables: monthly

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: W5E5v2.0, W5E5v1.0

Socio-economic data sets used: National historical Gross Domestic Product (GDP), National, gridded historical population

Land use data sets used: Historical, gridded land use

Other data sets used: Lightning, Land-sea mask

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

Spin-up

Was a spin-up performed?: Yes

Spin-up design: Spin-up experiments have been done for 1851-1900 using cycling climate forcing from 1901-1910 and transient CO2 conditions

Natural Vegetation

Natural vegetation partition: For each grid, SSiB4/TRIFFID-Fire simulates the fraction of 7 plant functional types (PFTs) + the bare soil: BET: Broadleaf evergreen tree NET: Needleleaf evergreen tree DBT: Deciduous broadleaf tree C3: C3 grass C4: C4 grass SHR: shrub TUN: tundra shrub

Natural vegetation dynamics: In each grid, the fraction of each PFTs is updated every 10 days related to the Net Primary Productivity

Soil layers: 3 layers

Model set-up specifications

How do you simulate bioenergy? i.e. what pft do you simulate on bioenergy land?: No bioenergy included

How do you simulate the transition from cropland to bioenergy?: No

How do you simulate pasture (which pft)?: We do not consider pasture

Key model processes

Dynamic vegetation: Yes. The fraction of each PFTs is updated every 10 days related to the Net Primary Productivity

Nitrogen limitation: No

Co2 effects: Yes. CO2 fertilization effects is considered

Phenology: Yes

Do you separate soil organic carbon in pasture from natural grass?: No

Do you harvest npp of crops? do you including grazing? how does harvested npp decay?: No

How do you to treat biofuel npp and biofuel harvest?: No

Does non-harvested crop npp go to litter in your output?: No

Causes of mortality in vegetation models

Age/senescence: No

Fire: Yes

Drought: Yes

Insects: Yes

Storm: No

Stochastic random disturbance: No

NBP components

Fire: Yes. Model considers fire process. The biomass to directly to the atmosphere

Species / Plant Functional Types (PFTs)

List of species / pfts: For each grid, SSiB4/TRIFFID-Fire simulates the fraction of 7 plant functional types (PFTs) + the bare soil: BET: Broadleaf evergreen tree NET: Needleleaf evergreen tree DBT: Deciduous broadleaf tree C3: C3 grass C4: C4 grass SHR: shrub TUN: tundra shrub

Fire modules

Aggregation of reported burnt area: Yes

Land-use classes allowed to burn: natural vegetation, peat land

Included fire-ignition factors: natural + human ignition

Is fire ignition implemented as a random process?: No

Is human influence on fire ignition and/or suppression included? how?: Yes. Human ignition and suppression are both related to population density and GDP

How is fire spread/extent modelled?: Fire extent = fire ignition count X average burned area per fire. The average burned area is assumed to be in elliptical shape related to wind speed and fuel moisture

Are deforestation or land clearing fires included?: No

What is the minimum burned area fraction at grid level?: 0