Results show that climate warming and permafrost thaw could potentially enhance methylmercury toxin production by an order of magnitude, impacting Arctic terrestrial and aquatic ecosystems by increased exposure to mercury through bioaccumulation and biomagnification in the food web.
Ice wedges, which are a common subsurface feature in permafrost landscapes, appear to be rapidly melting throughout the Arctic altering the microtopography and causing succession in polygon type that has profound changes to the storage and flow of water on the landscape
Exploring potential future climate effects on permafrost using hydrothermal modeling of arctic soils.
Progress and Accomplishments
LBNL Researchers Evaluate Methane Production, Oxidation, and Emissions Across Polygon Tundra Gradients
In an upcoming paper in Global Change Biology, LBNL researchers Lydia Smith Vaughn, Mark Conrad, Markus Bill, and Margaret Torn present results of a two-year field methane study in the Barrow Environmental Observatory.
Demonstration of CLM-PFLOTRAN Coupling Lays a Foundation for Biogeochemistry Simulation Across Scales
An implicit time-stepping model for decomposition, nitrification, denitrification, and plant nutrient uptake was implemented in the Community Land Model (CLM), the land ecosystem component of a coupled Earth System Model.
A Generic Law-of-the-Minimum Flux Limiter for Simulating Substrate Limitation in Biogeochemical Models
Complex biogeochemical networks that include many biotic and abiotic processes can be limited by different substrates under different conditions during their temporal evolution.