The International Land Model Benchmarking Package
Project description
It has been a while since our last release, but ILAMB continues to evolve. Many of the changes are ‘under the hood’ or bugfixes that are not readily seen. In the following, we present a few key changes and draw attention in particular to those that will change scores. We also have worked to make ILAMB ready to integrate with tools being developed as part of the Coordinated Model Evaluation Capabilities (CMEC).
Changes - May 2021
CMEC
Added CMEC-compliant JSON output to the standard outputs
Added an alternative landing page for ILAMB results which uses the LMT Unified Dashboard
Added support files for using cmec-driver as an alternative run environment
Quality of Life
Top page overhaul moving to a single result panel with a colorblind friendly palette
Shifted score colormaps to be more qualitative and colorblind friendly
ILAMB now has continuous integration testing using Azure Pipelines on each commit or pull request
ModelResults can be passed a list of paths to search for results, objects are cached as pickle files
Plotting limits are now based on the middle 98% across all models to help reduce the effect of a single model with extreme values washing out all the map plots
The configure file used to generate a run is now copied into the output directory as ilamb.cfg
ILAMB logfiles will now provide an estimate for peak memory usage in each confrontation which can be used in debugging and when running on large clusters with limited memory
Scoring
For scoring coupled models, we find that scoring the RMSE of the annual cycle is more reasonable. While the default is still set to score the full time series, this may be changed at runtime with –rmse_score_basis {series|cycle}
We have found that when comparing a set of models which contain a multimodel mean, the mean model’s interannual variability is typically lower which serendipitously better matches that of our reference data products. This makes the multimodel mean look even better relative to individual models but not for good reasons. We have disabled the interannual variability in our scoring.
We have updated a number of reference datasets to their most current version as well as many new datasets and comparions, run ilamb-fetch to update
Support for using observational uncertainty in scoring, currently disabled
Useful Information
Documentation - installation and basic usage tutorials
Sample Output
Paper published in JAMES which details the design and methodology employed in the ILAMB package. If you find the package or the output helpful in your research or development efforts, we kindly ask you to cite this work.
Description
The International Land Model Benchmarking (ILAMB) project is a model-data intercomparison and integration project designed to improve the performance of land models and, in parallel, improve the design of new measurement campaigns to reduce uncertainties associated with key land surface processes. Building upon past model evaluation studies, the goals of ILAMB are to:
develop internationally accepted benchmarks for land model performance, promote the use of these benchmarks by the international community for model intercomparison,
strengthen linkages between experimental, remote sensing, and climate modeling communities in the design of new model tests and new measurement programs, and
support the design and development of a new, open source, benchmarking software system for use by the international community.
It is the last of these goals to which this repository is concerned. We have developed a python-based generic benchmarking system, initially focused on assessing land model performance.
Funding
This research was performed for the Reducing Uncertainties in Biogeochemical Interactions through Synthesis and Computation (RUBISCO) Scientific Focus Area, which is sponsored by the Regional and Global Climate Modeling (RGCM) Program in the Climate and Environmental Sciences Division (CESD) of the Biological and Environmental Research (BER) Program in the U.S. Department of Energy Office of Science.
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