3:00 PM - 3:15 PM
[MIS05-18] Integral estimation of methane flux from the wetlands surface in southern part of Western Siberia based on the results of TerM simulation.
Keywords: physics of the atmosphere, Numerical Simulations, methane emissions
Numerical experiments were carried out using the Earth's surface model TerM (IWM RAS-MSU) in a configuration for regional calculations. This model is a one-dimensional realization of heat and mass transfer in the soil along with radiation and heat balances on the surface, consistent with vegetation blocks, calculation of turbulent flows from the surface, emissions components of carbon balance, etc. As mentioned above, this model includes the necessary parameterizations related to the description of the specifics of the hydrology of the peatland. In particular, the parameterization of the diffusion coefficient in the saturated and unsaturated zone, the parameterization of the groundwater level with horizontal gradient runoff, which reproduces some average water level for the cell depending on precipitation, evaporation and horizontal transport.
The numerical experiment was conducted for the territory including the southern taiga part of the West Siberian Plain for a period of 30 years from 1990 to 2021. As input data for the description of soil structure and vegetation distribution were used:
1. for landuse - IKI RAS land cover map
2. for soil parameters - matched and refined GSDS soil database
3. for wetland distribution - map based on Global Peatland Map v.2.0 data
The verification shows that the model reproduces, on average, the characteristic values for the selected micro-landscapes both in individual cells and for the entire region as a whole, compared with both point measurements and spatial estimates.
An analysis of thirty-year trends in the methane flux, averaged over time and territory, shows that there is an increase in the methane flux, especially in June and September, for the swamp, which is a reflection of the general increase in temperature in this climatic zone, characteristic of the last 30 years. At the same time, in June, when the flow is minimal, the increase in methane flow is almost not noticeable.
This work is performed within framework of the IMCES project FWRG-2021-0004
The numerical experiment was conducted for the territory including the southern taiga part of the West Siberian Plain for a period of 30 years from 1990 to 2021. As input data for the description of soil structure and vegetation distribution were used:
1. for landuse - IKI RAS land cover map
2. for soil parameters - matched and refined GSDS soil database
3. for wetland distribution - map based on Global Peatland Map v.2.0 data
The verification shows that the model reproduces, on average, the characteristic values for the selected micro-landscapes both in individual cells and for the entire region as a whole, compared with both point measurements and spatial estimates.
An analysis of thirty-year trends in the methane flux, averaged over time and territory, shows that there is an increase in the methane flux, especially in June and September, for the swamp, which is a reflection of the general increase in temperature in this climatic zone, characteristic of the last 30 years. At the same time, in June, when the flow is minimal, the increase in methane flow is almost not noticeable.
This work is performed within framework of the IMCES project FWRG-2021-0004