Models

Models

DAPPER (Data Assimilation for Predicting Productivity of Ecosystems and Regions)

A framework for assimilating diverse observations of ecosystems into an ecosystem model using Markov chain Monte Carlo and hierarchical Bayesian methods.  First application uses the 3-PG model and applies the framework to loblolly pine ecosystems of the Southeastern U.S.  Developed by research group.

Code repository

Publications:

Thomas, R. Q., E. Brooks, A. Jersild, E. Ward, R. Wynne, T.J. Albaugh, H. D. Aldridge, H. E. Burkhart, J-C Domec, T. R. Fox, C. A. Gonzalez-Benecke, A. Noormets, D. A. Sampson, and R. O. Teskey.  2017. Leveraging 35 years of Pinus taeda research in the southeastern US to constrain forest carbon cycle predictions: regional data assimilation using ecosystem experiments. Biogeosciences 14: 3525 – 3547 [link]

Thomas. R. Q., A. Jersild, E. Brooks, V. A. Thomas, and R. H. Wynne.  A mid-century ecological forecast with partitioned uncertainty predicts increases in loblolly pine forest productivity.  Accepted at Ecological Applications.


ACONITE (Analyzing of CarbON Nitrogen Interactions in Terrestrial Ecosystems)

ACONITE is a simple model of ecosystem C-N cycling and interactions that builds on theory related to plant economics in order to predict key ecosystem properties (leaf area index, leaf C:N, N fixation, and plant C use efficiency). Developed by research group and Mat Williams at the University of Edinburgh.

Please contact us for more information about the model and model code.  A github site for the model is pending.

Publications:

Thomas, R. Q. and Williams, M.: A model using marginal efficiency of investment to analyze carbon and nitrogen interactions in terrestrial ecosystems (ACONITE Version 1), Geosci. Model Dev., 7, 2015-2037, doi:10.5194/gmd-7-2015-2014, 2014.

Thomas, R. Q., M. Williams, M. A. Cavaleri, J.-F. Exbrayat, L. Smallman, and L.E. Street. Optimization of canopy carbon economy links canopy structure and function across leaf trait and climate gradients.  In revision for New Phytologist.


Community Earth System Model (CESM) including the Community Land Model (CLM)

We contribute to the evaluation, development, and application of the Community Land Model to study how nutrient limitation of forest ecosystems and forest management influence the climate system.

CESM and CLM

Publications:

Ahlswede, B. J. and R. Q. Thomas. 2017.  Community Earth System Model Simulations Reveal the Relative Importance of Afforestation and Forest Management to Surface Temperature in Eastern North America.  Forests 8: 499

Thomas, R.Q., E.N.J. Brookshire, and S. Gerber. 2015. Nitrogen limitation on land: How can it occur in Earth system models? Global Change Biology 21: 1777–1793

Thomas, R. Q., S. Zaehle, P.H. Templer, and C.L. Goodale. 2013. Global patterns of nitrogen limitation: Confronting two global biogeochemical models with observations.  Global Change Biology 19: 2986–2998.

Thomas, R. Q., G. B. Bonan, and C. L. Goodale. 2013.  Insights into mechanisms governing forest carbon response to nitrogen deposition: a model-data comparison using observed responses to nitrogen addition. Biogeosciences 10: 3869–3887.


General Lake Model (GLM)

We are applying the GLM to forecast water quality in drinking reservoirs as part of our NSF-funded project.

GLM is an open source, community developed model