Science Highlights

Wetland CH4 Flux Temperature Hysteresis Explained by Substrate Availability and Microbial Activity

Using a mechanistic ecosystem model, ecosys, to demonstrate that static temperature relations cannot accurately predict wetland CH4 production and emission rates due to substrate-mediated microbial and abiotic interactions.

Alaskan carbon-climate feedbacks will be weaker than inferred from short-term manipulations

Using a mechanistic land model, Ecosys, to demonstrate that short-term (< 10 year) warming experiments produce emergent ecosystem carbon stock temperature sensitivities inconsistent with multi-decadal responses due to the tightly coupled, nonlinear nature of high-latitude ecosystems

Coupling Surface and Subsurface Hydrology in Complex Terrain

A novel mathematical formulation allows accurate solution of water flow in geometrically complicated soil structures, including overturned soil layers and other soil disturbance.

Soil Geochemistry an Important Factor Influencing the rate and Magnitude of Greenhouse Gas Production in Tundra Soils

Rates and controls on CO2 and CH4 production were observed for two contrasting water‐saturated tundra soils within a permafrost‐affected watershed near Nome, AK.

Model-data Comparison Highlights Overlooked Processes in Models of Soil Moisture and Hydrology

Most models project a long-term drying of the surface soil for the permafrost region despite increases in the net air–surface water flux.

Bromide Tracer Studies Quantify Vertical and Horizontal Flow in Low- and High-centered Polygons

The study provides new insight into hydrological processes of low- and high-centered polygon systems, where flow and transport field investigations are almost totally lacking.

Creating a Safe, Secure, Open, and Inclusive Project

Leadership team takes time and intentional steps to build a culture of safety and respect across the project.

Impacts of Stoichiometry Traits on Carbon Accumulation using the E3SM Land Model

Plant stoichiometric flexibility controls the CO2 fertilization effect on ecosystem carbon accumulation.

Arctic Soil Governs Whether Climate Change Drives Losses or Gains in Soil Carbon

Multiple models are needed to capture true uncertainty of soil carbon fate in a changing world.

Understanding Vertical and Horizontal Flow in Ice-Wedge Polygons

Novel bromide tracer experiments are used to develop a model of subsurface flow and transport within ice-wedge polygons.