Improving Permafrost Modeling by Assimilating Remotely Sensed Soil Moisture
Knowledge of soil moisture conditions is important for modeling soil temperatures, as soil moisture influences the thermal dynamics in multiple ways. However, in permafrost regions, soil moisture is highly heterogeneous and difficult to model. Satellite soil moisture data may fill this gap, but the...
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ftawi:oai:epic.awi.de:49277 2024-09-15T18:29:44+00:00 Improving Permafrost Modeling by Assimilating Remotely Sensed Soil Moisture Zwieback, S. Westermann, S. Langer, Moritz Boike, J. Marsh, P. Berg, A. 2019 https://epic.awi.de/id/eprint/49277/ https://doi.org/10.1029/2018WR023247 https://hdl.handle.net/10013/epic.71f49a8a-cd7d-4444-9c34-725f0d99e299 unknown Zwieback, S. , Westermann, S. , Langer, M. orcid:0000-0002-2704-3655 , Boike, J. orcid:0000-0002-5875-2112 , Marsh, P. and Berg, A. (2019) Improving Permafrost Modeling by Assimilating Remotely Sensed Soil Moisture , Water Resources Research, 55 . doi:10.1029/2018WR023247 <https://doi.org/10.1029/2018WR023247> , hdl:10013/epic.71f49a8a-cd7d-4444-9c34-725f0d99e299 EPIC3Water Resources Research, 55, ISSN: 00431397 Article isiRev 2019 ftawi https://doi.org/10.1029/2018WR023247 2024-06-24T04:22:11Z Knowledge of soil moisture conditions is important for modeling soil temperatures, as soil moisture influences the thermal dynamics in multiple ways. However, in permafrost regions, soil moisture is highly heterogeneous and difficult to model. Satellite soil moisture data may fill this gap, but the degree to which they can improve permafrost modeling is unknown. To explore their added value for modeling soil temperatures, we assimilate fine‐scale satellite surface soil moisture into the CryoGrid‐3 permafrost model, which accounts for the soil moisture's influence on the soil thermal properties and the surface energy balance. At our study site in the Canadian Arctic, the assimilation improves the estimates of deeper (>10 cm) soil temperatures during summer but not consistently those of the near‐surface temperatures. The improvements in the deeper temperatures are strongly contingent on soil type: They are largest for porous organic soils (30%), smaller for thin organic soil covers (20%), and they essentially vanish for mineral soils (only synthetic data available). That the improvements are greatest over organic soils reflects the strong coupling between soil moisture and deeper temperatures. The coupling arises largely from the diminishing soil thermal conductivity with increasing desiccation thanks to which the deeper soil is kept cool. It is this association of dry organic soils being cool at depth that lets the assimilation revise the simulated soil temperatures toward the actually measured ones. In the future, the increasing availability of satellite soil moisture data holds promise for the operational monitoring of soil temperatures, hydrology, and biogeochemistry. Article in Journal/Newspaper permafrost Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Water Resources Research 55 3 1814 1832 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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Knowledge of soil moisture conditions is important for modeling soil temperatures, as soil moisture influences the thermal dynamics in multiple ways. However, in permafrost regions, soil moisture is highly heterogeneous and difficult to model. Satellite soil moisture data may fill this gap, but the degree to which they can improve permafrost modeling is unknown. To explore their added value for modeling soil temperatures, we assimilate fine‐scale satellite surface soil moisture into the CryoGrid‐3 permafrost model, which accounts for the soil moisture's influence on the soil thermal properties and the surface energy balance. At our study site in the Canadian Arctic, the assimilation improves the estimates of deeper (>10 cm) soil temperatures during summer but not consistently those of the near‐surface temperatures. The improvements in the deeper temperatures are strongly contingent on soil type: They are largest for porous organic soils (30%), smaller for thin organic soil covers (20%), and they essentially vanish for mineral soils (only synthetic data available). That the improvements are greatest over organic soils reflects the strong coupling between soil moisture and deeper temperatures. The coupling arises largely from the diminishing soil thermal conductivity with increasing desiccation thanks to which the deeper soil is kept cool. It is this association of dry organic soils being cool at depth that lets the assimilation revise the simulated soil temperatures toward the actually measured ones. In the future, the increasing availability of satellite soil moisture data holds promise for the operational monitoring of soil temperatures, hydrology, and biogeochemistry. |
format |
Article in Journal/Newspaper |
author |
Zwieback, S. Westermann, S. Langer, Moritz Boike, J. Marsh, P. Berg, A. |
spellingShingle |
Zwieback, S. Westermann, S. Langer, Moritz Boike, J. Marsh, P. Berg, A. Improving Permafrost Modeling by Assimilating Remotely Sensed Soil Moisture |
author_facet |
Zwieback, S. Westermann, S. Langer, Moritz Boike, J. Marsh, P. Berg, A. |
author_sort |
Zwieback, S. |
title |
Improving Permafrost Modeling by Assimilating Remotely Sensed Soil Moisture |
title_short |
Improving Permafrost Modeling by Assimilating Remotely Sensed Soil Moisture |
title_full |
Improving Permafrost Modeling by Assimilating Remotely Sensed Soil Moisture |
title_fullStr |
Improving Permafrost Modeling by Assimilating Remotely Sensed Soil Moisture |
title_full_unstemmed |
Improving Permafrost Modeling by Assimilating Remotely Sensed Soil Moisture |
title_sort |
improving permafrost modeling by assimilating remotely sensed soil moisture |
publishDate |
2019 |
url |
https://epic.awi.de/id/eprint/49277/ https://doi.org/10.1029/2018WR023247 https://hdl.handle.net/10013/epic.71f49a8a-cd7d-4444-9c34-725f0d99e299 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
EPIC3Water Resources Research, 55, ISSN: 00431397 |
op_relation |
Zwieback, S. , Westermann, S. , Langer, M. orcid:0000-0002-2704-3655 , Boike, J. orcid:0000-0002-5875-2112 , Marsh, P. and Berg, A. (2019) Improving Permafrost Modeling by Assimilating Remotely Sensed Soil Moisture , Water Resources Research, 55 . doi:10.1029/2018WR023247 <https://doi.org/10.1029/2018WR023247> , hdl:10013/epic.71f49a8a-cd7d-4444-9c34-725f0d99e299 |
op_doi |
https://doi.org/10.1029/2018WR023247 |
container_title |
Water Resources Research |
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55 |
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3 |
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1814 |
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1832 |
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