Advancing the predictive power of Earth system models through understanding
of the structure and function of Arctic terrestrial ecosystems
Progress & Accomplishments
NGEE Arctic Mid-Phase Review: Phase 3 (2019–2024)
The NGEE Arctic team recently presented our Phase 3 progress and plans to the US Department of Energy’s Biological and Environmental Research program managers.
A conspicuous signal of climate change in high-latitude tundra
The accurate representation of microbial functional guilds within ecosystem models is critical for predicting ecosystem recovery on multi-decadal time scales.
Observed spatial variability of soil pore water geochemistry
Environmental controls on soil pore water concentrations of several solutes are inferred from spatial variability, co-located measurements, and thermodynamic geochemical models.
Iron plaques indicate active belowground redox cycling in saturated soils
Localized Fe plaque formation was identified on roots obtained from Arctic tundra, indicating the potential for these roots to release oxygen gas and alter subsurface redox biogeochemistry.
Combining a data availability and needs analysis for parameters with qualitative causal loop analysis helps to identify parameters that are in most need of additional field data.
Deepening of the thaw layer resulted in increased concentrations and age of DOC in surface and pore waters that may contribute to greenhouse gas emissions as warming increases permafrost thaw.
Climate change impacts on high-latitude carbon assimilation
Analysis highlights the challenges and opportunities for reducing model uncertainty associated with estimation of gross primary productivity in the Arctic boreal region.
