University Of Tasmania
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How modellers model: the overlooked social and human dimensions in model intercomparison studies

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journal contribution
posted on 2023-05-21, 12:03 authored by Albanito, F, McBey, D, Matthew HarrisonMatthew Harrison, Smith, P, Ehrhardt, F, Bhatia, A, Bellocchi, G, Brilli, L, Carozzi, M, Karen Christie, Doltra, J, Dorich, CD, Doro, L, Grace, P, Grant, B, Leonard, J, Liebig, M, Ludemann, C, Martin, R, Meier, E, Meyer, R, De Antoni Migliorati, M, Myrgiotis, V, Recous, S, Sandor, R, Snow, V, Soussana, J-P, Smith, WN, Fitton, N
There is a growing realization that the complexity of model ensemble studies depends not only on the models used but also on the experience and approach used by modelers to calibrate and validate results, which remain a source of uncertainty. Here, we applied a multi-criteria decision-making method to investigate the rationale applied by modelers in a model ensemble study where 12 process-based different biogeochemical model types were compared across five successive calibration stages. The modelers shared a common level of agreement about the importance of the variables used to initialize their models for calibration. However, we found inconsistency among modelers when judging the importance of input variables across different calibration stages. The level of subjective weighting attributed by modelers to calibration data decreased sequentially as the extent and number of variables provided increased. In this context, the perceived importance attributed to variables such as the fertilization rate, irrigation regime, soil texture, pH, and initial levels of soil organic carbon and nitrogen stocks was statistically different when classified according to model types. The importance attributed to input variables such as experimental duration, gross primary production, and net ecosystem exchange varied significantly according to the length of the modeler’s experience. We argue that the gradual access to input data across the five calibration stages negatively influenced the consistency of the interpretations made by the modelers, with cognitive bias in “trial-and-error” calibration routines. Our study highlights that overlooking human and social attributes is critical in the outcomes of modeling and model intercomparison studies. While complexity of the processes captured in the model algorithms and parameterization is important, we contend that (1) the modeler’s assumptions on the extent to which parameters should be altered and (2) modeler perceptions of the importance of model parameters are just as critical in obtaining a quality model calibration as numerical or analytical details.


Australian Wool Innovation Limited


Publication title

Environmental Science & Technology










Tasmanian Institute of Agriculture (TIA)


Amer Chemical Soc

Place of publication

1155 16Th St, Nw, Washington, USA, Dc, 20036

Rights statement

© 2022 The Authors. Published by American Chemical Society. This is an open access article under the terms of the Creative Commons This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License, ( which permits use, distribution and reproduction in any medium, provided the original work is properly sited.

Repository Status

  • Open

Socio-economic Objectives

Climate change adaptation measures (excl. ecosystem); Social impacts of climate change and variability; Management of greenhouse gas emissions from plant production