Unknown
European Geosciences Union
In:
EPIC3Earth System Dynamics, European Geosciences Union, 4(2), pp. 187-198, ISSN: 2190-4987
Publication Date:
2021-07-19
Description:
Subgrid processes occur in various ecosystems
and landscapes but, because of their small scale, they are
not represented or poorly parameterized in climate models.
These local heterogeneities are often important or even fundamental
for energy and carbon balances. This is especially
true for northern peatlands and in particular for the polygonal
tundra, where methane emissions are strongly influenced by
spatial soil heterogeneities.We present a stochastic model for
the surface topography of polygonal tundra using Poisson–
Voronoi diagrams and we compare the results with available
recent field studies. We analyze seasonal dynamics of water
table variations and the landscape response under different
scenarios of precipitation income. We upscale methane
fluxes by using a simple idealized model for methane emission.
Hydraulic interconnectivities and large-scale drainage
may also be investigated through percolation properties and
thresholds in the Voronoi graph. The model captures the main
statistical characteristics of the landscape topography, such
as polygon area and surface properties as well as the water
balance. This approach enables us to statistically relate
large-scale properties of the system to the main small-scale
processes within the single polygons.
Repository Name:
EPIC Alfred Wegener Institut
Type:
Article
,
isiRev
Format:
application/pdf
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