GMDD Geoscientific Model Development Discussions GMDD 1991-962X Copernicus GmbH Göttingen, Germany 10.5194/gmdd-6-379-2013 Calibration of the Crop model in the Community Land Model Zeng X. 1 3 Drewniak B. A. 2 Constantinescu E. M. 1 Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, USA Environmental Science Division, Argonne National Laboratory, Argonne, USA Department of Mathematics, Shanghai University, Shanghai, China 22 01 2013 6 1 379 398 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.geosci-model-dev-discuss.net/6/379/2013/gmdd-6-379-2013.html The full text article is available as a PDF file from http://www.geosci-model-dev-discuss.net/6/379/2013/gmdd-6-379-2013.pdf

Farming is using more terrestrial ground with increases in population and the expanding use of agriculture for non-nutritional purposes such as biofuel production. This agricultural expansion exerts an increasing impact on the terrestrial carbon cycle. In order to understand the impact of such processes, the Community Land Model (CLM) has been augmented with a CLM-Crop extension that simulates the development of three crop types: maize, soybean, and spring wheat. The CLM-Crop model is a complex system that relies on a suite of parametric inputs that govern plant growth under a given atmospheric forcing and available resources. CLM-Crop development used measurements of gross primary productivity and net ecosystem exchange from AmeriFlux sites to choose parameter values that optimize crop productivity in the model. In this paper we calibrate these values in order to provide a faithful projection in terms of both plant development and net carbon exchange, using a Markov chain Monte Carlo technique.

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