Open AccessDocumentation and analysis of a global CO{sub 2} model developed by Peng et al. (1983)
Author(s) -
Henriëtte I. Jager,
Ta-Jen Peng,
A. W. King,
Michael J. Salé
Publication year - 1990
Language(s) - English
Resource type - Reports
DOI - 10.2172/661513
Subject(s) - sensitivity (control systems) , alkalinity , parameterized complexity , calibration , environmental science , documentation , meteorology , statistics , computer science , econometrics , mathematics , algorithm , chemistry , geography , engineering , programming language , electronic engineering
A global carbon model, the Peng `83 model, has been standardized according to protocols developed for an intermodel comparison. The first part of this document describes the model as they received it, and the second part describes a standardized version of the model, which has been parameterized according to the protocols described. Model performance was evaluated according to defined criteria and a sensitivity analysis of the model was conducted to identify the most important parameters. The standardized model was supplemented with a calibration routine to define reasonable combinations of initial conditions. This improved the ability of the model to hold an initial equilibrium state. Sensitivity analysis showed a shift in parameter importances with time. The initial conditions were of greatest importance for the length of these simulations, but declined in longer simulations. With the initial pCO{sub 2} excluded from the sensitivity analysis, ocean surface area (used to extrapolate results) was second in importance. While the CO{sub 2} exchange rate were initially most important, the model projections of atmospheric CO{sub 2} soon became more sensitive to the alkalinity of the ocean