Progress and Accomplishments
- Soil warming decreases microbial functional diversity in the Arctic Tundra
- Database survey of key traits for improved modeling of Arctic vegetation
- Successfully acquired LiDAR and photogrammetry data at centimeter resolution of the NGEE-Arctic Teller research site using an Unmanned Aerial System (UAS)
- Data assimilation of the historical temperature observations is completed.
Coupled land surface-subsurface hydrogeophysical inverse modeling to estimate soil organic carbon content and explore associated hydrological and thermal dynamics in an Arctic tundra ecosystemWe develop and test a joint deterministic–stochastic inversion approach that can take advantage of time-lapse electrical resistivity and other data.
Microtopography determines how active layer depths respond to changes in temperature and precipitation at the NGEE-Arctic BEO sitesWe applied a well-tested three-dimensional coupled biogeochemistry, hydrology, vegetation, and thermal model (ecosys) to polygonal tundra sites to quantify and scale the effects of microtopography on active layer depths.
Impacts of microtopographic snow-redistribution and lateral subsurface processes on hydrologic and thermal states in an Arctic polygonal ground ecosystem: Development and testing in the E3SM Land ModelThe NGEE-Arctic and E3SM Land Model (ELM) groups recognize the importance of 3-dimensional processes, so we developed an ELM version that includes thermal and hydrological dynamics to investigate these processes at the BEO.
- A newly published database of permafrost zone waterbodies with better than 5 m resolution will improve next-generation land model representations of high-latitude hydrology and biogeochemistry.
The differential free energy of activation in the transition state of Michaelis-Menten-Monod enzymatic reactionsA classical thermodynamic theory was extended to better characterize microbial process for integration with next generation land models.
- Motivated by the strong N limitations in high-latitude systems, a comprehensive global analysis of nitrogen allocation in leaves was developed for integration in ESM-scale land models.
- We started a replicated (n=5 chambers) warming experiment in Barrow, AK. The experiment uses solar radiation to warm vegetation and will enable us to understand thermal acclimation of respiration and photosynthesis in Arctic vegetation.
- Participants, guests, and partners in the NGEE Arctic project met at the PARC 55 Hotel in San Francisco to review progress and accomplishments, and outline plans for the coming year.
- These statistics reflect metadata submission since its implementation in the spring of 2014. Metadata records reflect a combination of data, information and documentation that form a collection.
- NGEE Arctic scientists contribute to an international database of vegetation data from the Alaskan Arctic tundra
LBNL Researchers Evaluate Methane Production, Oxidation, and Emissions Across Polygon Tundra GradientsUsing field measurements of methane flux and stable isotopes, NGEE Arctic researchers identify spatial patterns in methane emissions and underlying metabolic processes across polygon types and features
BNL Plant Physiologist Publishes Roadmap for Improving Representation of Photosynthesis in Earth System ModelsScientist on the NGEE Arctic project examines how photosynthesis is represented in seven terrestrial biosphere models and makes community-wide recommendations to improve estimates of carbon uptake by terrestrial vegetation
Modeling the Spatiotemporal Variability in Subsurface Thermal Regimes across a Low-Relief Polygonal Tundra LandscapeStudy develops an end-to-end high resolution modeling framework to simulate permafrost thermal dynamics of microtopography dominated polygonal tundra landscape
UAF Researchers “Scale Up” Permafrost Thermal Measurements in Western Alaska Using an Ecotype ApproachField scientists develop a ground temperature map for western Alaska based on measured relationships between ground thermal regimes and vegetation ecotypes
- Sebastien Biraud provided an initial glimpse of what UAS flights could mean for integration of above- and below-ground research at field sites on the Seward Peninsula
- Collaborative team improved the methane module in CLM and ALM and compared predictions with NGEE-Arctic and other tower observations, NASA CARVE aircraft observations, and two atmospheric inversions and highlight new ways to improve global CH4 predictions
- Explicit aqueous phase redox, pH, and mineral interaction dynamics were coupled to the Converging Trophic Cascade (CTC) decomposition model, enabling prediction of CO2 and CH4 production from Arctic polygonal tundra soils.
- Four 0.5 FTE positions were funded under the CMDV project to facilitate communication and model development collaborations between NGEE Arctic, NGEE Tropics, and the ACME Land Model (ALM).
Mapping Arctic Plant Functional Type Distributions in the Barrow Environmental Observatory Using WorldView-2 and LiDAR DatasetsNGEE Arctic researchers combined high-resolution multi-spectral remote sensing imagery from the WorldView-2 satellite with light detecting and ranging (LiDAR)-derived digital elevation models (DEMs) to characterize the tundra vegetation around the BEO.
Modeling the Spatiotemporal Variability in Subsurface Thermal Regimes across a Low-Relief Polygonal Tundra LandscapeStudy develops an end-to-end high resolution modeling framework to simulate permafrost thermal dynamics of microtopography dominated polygonal tundra landscape.
Geomorphological and Geochemistry Changes in Permafrost after Wildfire in Kougarok, Seward Peninsula, AlaskaAn event of permafrost degradation and recovery after a disturbance by 2002 Kougarok wildfire was discussed from long-term monitoring and permafrost core analysis on the central Seward Peninsula.
- The Hal Mooney Award recognizes an individual for extraordinary near-surface geophysical scientific achievements and community service.
- Significant methane oxidation activity was observed in incubations of flat-centered polygon transitional soil and permafrost layers, which also exhibited high levels of methane production activity under anoxic conditions.
- Explicitly representing plant physiological root traits and improving the nutrient competition algorithm with the Equilibrium Chemistry Approximation removes known biases in CLM and ALM.
Coincident Above- and Below-Ground Autonomous Monitoring Strategy: Development and Use to Monitor Arctic Ecosystem Freeze-Thaw DynamicsSoil moisture and thaw thickness strongly influence vegetation, and can serve as a proxy for vegetation greenness (and vice versa) during the growing season.
- NGEE Arctic participates in University of Alaska Fairbanks Northwest Campus’ platform to discuss ongoing hydrology research efforts with the community.
Demonstration of CLM-PFLOTRAN Coupling Lays a Foundation for Biogeochemistry Simulation Across ScalesAn 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.
- Permafrost thaw and climate warming accelerates frozen soil organic carbon (SOC) degradation and emission of greenhouse gases, but what specific degradation pathways for labile SOC occur prior to CH4 and CO2 production are not well understood.
The NGEE Arctic website, to be released later in April, will have a new look and feel moving from an unsupported Drupal 6 into Drupal 7.
- The ORNL NGEE Arctic Data Management Team (DMT) is lending expertise and tools deployed for the NGEE Arctic data effort to the NGEE Tropics project. The DMT has deployed a multi-faceted system for NGEE Arctic comprised of the On-line Metadata Editor (OME)
- These statistics reflect metadata submission and usage of the NGEE Arctic Search Tool since its implementation in the spring of 2014. Metadata records reflect a combination of data, information and documentation that form a collection. While all metadata
LBNL Researchers Evaluate Methane Production, Oxidation, and Emissions Across Polygon Tundra GradientsIn 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.
- Model simulations by LANL scientists were used to assess the relative effect of environment on active layer thickness.
- Current approaches to raising air temperatures are plagued by needing access to electrical power. Scientists on the NGEE Arctic problem are working to overcome that common constraint…
A rock physics investigation of unconsolidated saline permafrost: P-wave properties from laboratory ultrasonic measurementsResearchers at LBNL apply seismic methods to examine characteristics of saline permafrost from coastal plain, Barrow, AK.
- NGEE Arctic thanks Larry Hinzman for his contributions to Phase 1 and welcomes Vladimir Romanovsky in his expanded role as Chief Scientist.
- The planned establishment of research sites on the Seward Peninsula during Phase 2 prompts a large field reconnaissance trip to Nome.