Publication Date:
2021-07-19
Description:
Freeze/thaw (F/T) processes can be quite different
under the various land surface types found in the complex
tundra of the Arctic, such as polygonal tundra (wet center
and dry rims), ponds, and thermokarst lakes. Proper simu-
lation of these different processes is essential for accurate
prediction of the release of greenhouse gases under a warm-
ing climate scenario. In this study we have incorporated the
water layer into a dynamic organic soil version of the Terres-
trial Ecosystem Model (DOS-TEM), having first verified and
validated the model. Results showed that (1) the DOS-TEM
was very efficient and its results compared well with analyti-
cal solutions for idealized cases, and (2) despite a number of
limitations and uncertainties in the modeling, the simulations
compared reasonably well with in situ measurements from
polygon rims, polygon centers (with and without water), and
lakes on Samoylov Island, Siberia, indicating the suitability
of the DOS-TEM for simulating the various F/T processes.
Sensitivity tests were performed on the effects of water depth
and our results indicated that both water and snow cover are
very important in the simulated thermal processes, for both
polygon centers and lakes. We therefore concluded that the
polygon rims and polygon centers (with various maximum
water depths) should be considered separately, and that the
dynamics of water depth in both polygons and lakes should
be taken into account when simulating thermal processes for
methane emission studies.
Repository Name:
EPIC Alfred Wegener Institut
Type:
Article
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isiRev
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info:eu-repo/semantics/article
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