Science Highlights

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.

Unfrozen Permafrost Presence in Shrub-Dominated Landscapes

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

Tundra Plant Trait Database

Worldwide trait database addresses long-standing questions about trait-environment relationships and provides an unprecedented digital resource to inform Earth system models.

Mapping Vegetation Communities using Convolutional Neural Networks

Artificial intelligence applied to multiple remote sensing datasets accurately represents shrub distribution across hillslopes at the Kougarok field site.

Photosynthesis by Tundra Plants Sensitive to Low Temperatures

Light-harvesting processes involved in photosynthesis by tundra plants are unexpectedly sensitive to growth at low temperatures.

NGEE Arctic and EMSL collaborate to provide molecular-scale insights into SOM degradation

Biochemical composition is proposed to improve process-based models of SOM degradation and climate feedbacks

Landscape Mapping using Remote Sensing and Neural Networks

A convolutional neural network (CNN) approach produced highly accurate vegetation classifications. Hyper-spectral datasets (e.g., AVIRIS) were most useful for our machine learning approaches. Accurate and high-resolution datasets generated using our approach are needed for Arctic models.

Spatial and temporal controls on nitrogen availability in polygonal tundra landscapes

Several scaling strategies based on geomorphology were evaluated for complex polygonal landscapes.

Microtopography Determines How CO2 and CH4 Exchanges Respond to Temperature and Precipitation in Polygonal Tundra

Microtopographic variation among troughs, rims, and centers strongly affects the movement of surface water and snow and thereby affects soil water contents and active layer development.

Intermediate Model Overcomes Computational Costs of Simulating Thermal-Hydrology for Polygonal Landscapes

Modeling approach improving representations of permafrost dynamics in evolving landscapes.