NGEE Arctic | "...improving climate model predictions through advanced understanding of coupled processes in Arctic terrestrial ecosystems."

Safety preparations at field site
Snow depth measurements at Teller field site
Installation of tram across polygonal tundra
Data units ready for transport
Helicopter drops off NGEE Arctic scientists
Double-checking safety equipment
Snowmachines ready for trip to field site
DOE sponsors in Utqiagvik, AK
NGEE Arctic eddy covariance tower near Council, AK
Transport of power and communication platform
Power and communications unit near Council, AK
Scenic vista on the Seward Penninsula
Coastline of Norton Sound near Nome, AK
Winter commute to field sites
Shrub survey at Kougarok field site

Media Mentions

Controls on Nitrogen Nutrient Availability in the Arctic Tundra

Earth Science Women's Network Member Spotlights - Colleen Iverson

Breaking the Ice: ORNL Explorer Back from the Arctic

Cold, Hard Data: ORNL Data Scientists Support Historic Arctic Expedition

Climate Change is Turning Arctic’s Carbon Sinks into Carbon Emitters

Wildfires Could Permanently Alter Alaska’s Forest Composition

Science Highlights

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

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

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

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

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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.

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Unfrozen Permafrost Presence in Shrub-Dominated Landscapes

Field observations and model simulations confirm the presence of unfrozen permafrost in shrub-dominated landscapes.

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Schematic of modeling transect.

Progress & Accomplishments

Permafrost Thermal Conditions are Sensitive to Shifts in Snow Timing

Impact of Lateral Flow on the Water Status of Polygon Centers

Estimating Critical Permafrost Properties from Easily Observed Permafrost State Data

Publications

Modeling climate change impacts on an Arctic Polygonal Tundra: 1. Rates of permafrost thaw depend on changes in vegetation and drainage

Competitor and substrate sizes and diffusion together define enzymatic depolymerization and microbial substrate uptake rates

A theory of effective microbial substrate affinity parameters in variably saturated soils and an example application to aerobic soil heterotrophic respiration

Arctic soil governs whether climate change drives global losses or gains in soil carbon