Lateral subsurface hydrologic and thermal processes were explicitly represented in the E3SM Land Model.
A novel analysis of the impact of snow redistribution and lateral subsurface processes on hydrologic and thermal states at a polygonal tundra site near Utqiagvik (Barrow), Alaska.
The research demonstrates the importance of including accurate surface distribution of snow in models in order to simulate the temperature of subsurface soil temperature and moisture, both vertically and horizontally, during winter and into the warmer seasons.
Current land surface models, including the E3SM Land Model v1 (ELMv1), are inadequate to capture landscape heterogeneity due to microtopographic features in the Alaskan Arctic costal plan. A team led by Lawrence Berkeley National Laboratory extended the ELM to redistribute incoming snow by accounting for microtopography and incorporated subsurface lateral transport of water and energy. The spatial heterogeneity of snow depth during the winter due to snow redistribution generated surface soil temperature heterogeneity that propagated in depth and time. Excluding lateral subsurface hydrologic and thermal processes led to an overestimation of spatial variability in soil moisture and soil temperature as subsurface liquid pressure and thermal gradients were artificially prevented from spatially dissipating over time. This work also demonstrates an important 3D modeling capability integrated in the global-scale land model ELMv1.
Contacts (BER PM)
Dorothy Koch and Daniel Stover
Dorothy.Koch@science.doe.gov (301-903-0105) and DanielStover@science.doe.gov
William J. Riley
Lawrence Berkeley National Laboratory
This research was supported by the Director, Office of Science, Office of Biological and Environmental Research of the US Department of Energy under contract no. DE-AC02- 05CH11231 as part of the NGEE-Arctic and Energy Exascale Earth System Model (E3SM) programs.
Bisht, G., W.J. Riley, H.M. Wainwright, B. Dafflon, Y. Fengming, and V.E. Romanovsky. "Impacts of microtopographic snow redistribution and lateral subsurface processes on hydrologic and thermal states in an Arctic polygonal ground ecosystem: a case study using ELM-3D v1.0." Geosci. Model Dev. 11, 61-76, (2018). [DOI:10.5194/gmd-11-61-2018]
SC-23.1 Climate and Environmental Sciences Division, BER
BER supports basic research and scientific user facilities to advance DOE missions in energy and environment. More about BER
Aug 24, 2019
New Approach for Studying How Microbes Influence Their Environment
A diverse group of scientists suggests a common framework and targeting of known microbial processes [more...]
Aug 08, 2019
Nutrient-Hungry Peatland Microbes Reduce Carbon Loss Under Warmer Conditions
Enzyme production in peatlands reduces carbon lost to respiration under future high temperatures. [more...]
Aug 05, 2019
Amazon Forest Response to CO2 Fertilization Dependent on Plant Phosphorus Acquisition
AmazonFACE Model Intercomparison. The Science Plant growth is dependent on the availabi [more...]
Jul 29, 2019
A Slippery Slope: Soil Carbon Destabilization
Carbon gain or loss depends on the balance between competing biological, chemical, and physical reac [more...]
Jul 15, 2019
Field Evaluation of Gas Analyzers for Measuring Ecosystem Fluxes
How gas analyzer type and correction method impact measured fluxes. The Science A side- [more...]
List all highlights (possible long download time)