Modelling spatio-temporal soil moisture dynamics in mountain tundra
Tyystjärvi, Vilna; Kemppinen, Julia; Luoto, Miska; Aalto, Tuula; Markkanen, Tiina; Launiainen, Samuli; Kieloaho, Antti-Jussi; Aalto, Juha (2021-12-12)
Tyystjärvi, V., Kemppinen, J., Luoto, M., Aalto, T., Markkanen, T., Launiainen, S., Kieloaho, A.-J., & Aalto, J. (2022). Modelling spatio-temporal soil moisture dynamics in mountain tundra. Hydrological Processes, 36( 1), e14450. https://doi.org/10.1002/hyp.14450
This is the peer reviewed version of the following article: Tyystjärvi, V., Kemppinen, J., Luoto, M., Aalto, T., Markkanen, T., Launiainen, S., Kieloaho, A.-J., & Aalto, J. (2022). Modelling spatio-temporal soil moisture dynamics in mountain tundra. Hydrological Processes, 36( 1), e14450, which has been published in final form at https://doi.org/10.1002/hyp.14450. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
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https://urn.fi/URN:NBN:fi-fe2022092760244
Tiivistelmä
Abstract
Soil moisture has a fundamental influence on the processes and functions of tundra ecosystems. Yet, the local dynamics of soil moisture are often ignored, due to the lack of fine resolution, spatially extensive data. In this study, we modelled soil moisture with two mechanistic models, SpaFHy (a catchment-scale hydrological model) and JSBACH (a global land surface model), and examined the results in comparison with extensive growing-season field measurements over a mountain tundra area in northwestern Finland. Our results show that soil moisture varies considerably in the study area and this variation creates a mosaic of moisture conditions, ranging from dry ridges (growing season average 12 VWC%, Volumetric Water Content) to water-logged mires (65 VWC%). The models, particularly SpaFHy, simulated temporal soil moisture dynamics reasonably well in parts of the landscape, but both underestimated the range of variation spatially and temporally. Soil properties and topography were important drivers of spatial variation in soil moisture dynamics. By testing the applicability of two mechanistic models to predict fine-scale spatial and temporal variability in soil moisture, this study paves the way towards understanding the functioning of tundra ecosystems under climate change.
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