Arctic Research Directory

ID-341 :   Estimation of GHG balance in the Arctic using land ecosystem model

Type

MODEL

Title

Estimation of GHG balance in the Arctic using land ecosystem model

Abstract

We will develop and improve the terrestrial ecosystem model (VISIT) to evaluate greenhouse gas exchange between the atmosphere and the land, and simulate the greenhouse gas balance under changing environments at broad scales.

Model Characteristics

The fluxes of CO2, CH4 and N2O are evaluated by handling the carbon and nitrogen cycles. For boreal forests, parts of emissions from fires can be assessed.

Computing Environment

Point: MacBookPro, broad area: NIES scalar type supercomputer etc

Principal Investigator

Akihiko Ito
National Institute for Environmental Studies
itoh@nies.go.jp

JSPS KAKENHI Grant Number

17H01867

ERTDF Granted Number

2−1710

Funding Information Other Funding Details

NIES

Data Information

Model Name
VISIT
Abstract (Brief description of the experiment contents (initial conditions, boundary conditions, etc.))
Simulations were conducted for the period January 1901 to December 2016 at a spatial resolution of 0.5 deg x 0.5 deg in latitude and longitude. Climate conditions (air temperature, precipitation, cloudiness, and humidity) were derived from global historical observation-based mesh data of CRU TS3.25 (Harris et al., 2014). Global mean atmospheric CO2 and CH4 concentrations during the simulation period were determined by historical data of the representative concentration pathways (Meinshausen et al., 2011), enabling a ready connection with future projection. Land-use conditions (fractional coverage of primary and secondary lands, pasture, and cropland and their mutual transitions) were derived from historical data in the Harmonized Land Use database (Hurtt et al., 2011). Spin-up by iterative calculation was performed at each grid cell until reaching an equilibrium state of the carbon cycle, for 300 to 4000 yr, under stationary climate and atmospheric conditions. A baseline experimental simulation was conducted following the spin-up, including the changes in climate, atmospheric greenhouse gases, and land-use conditions. This study focused on pan-Arctic (i.e., above 60degN) wetlands, as defined by the Global Lake and Wetland Dataset (Lehner and Döll, 2004). The 1-km-mesh data were aggregated into the model resolution of 0.5 deg grid cells . I assumed that land-use conversion from natural ecosystems to croplands occurs only in forests and grasslands (i.e., no landfill).
Temporal Extent
Begin Date1901-01-01
End Date2016-12-31
Temporal Characteristicsmonthly
Geographic Bounding Box
North bound latitude90.0
West bound longitude0.0
Eastbound longitude360.0
South bound latitude-90.0
Grid
Dimension NameDimension Size (slice number of the dimension)Resolution Unit
row3600.5 (deg)
column7200.5 (deg)
vertical1land surface
Data Information
CH4 budget of northern wetlands simulated by the VISIT model
Article (the article written using this data)
Ito, A.: Methane emission from pan-Arctic natural wetlands estimated using a process-based model, 1901–2016, Polar Science, in press. https://doi.org/10.1016/j.polar.2018.12.001

Personnel

RollContact PersonNameAkihiko ItoAffiliationNational Institute for Environmental StudiesCountryJapanEmailitoh@nies.go.jp
Data Registration
16:16 on Fri July 19, 2019
Last Update
16:16 on Fri July 19, 2019