Details

Autor(en) / Beteiligte

• Backman, John
• Wood, Curtis R
• Auvinen, Mikko
• Kangas, Leena
• Hannuniemi, Hanna
• Karppinen, Ari
• Kukkonen, Jaakko

Titel

Sensitivity analysis of the meteorological preprocessor MPP-FMI 3.0 using algorithmic differentiation

Ist Teil von

• Geoscientific Model Development, 2017-10, Vol.10 (10), p.3793-3803

Ort / Verlag

Katlenburg-Lindau: Copernicus GmbH

Erscheinungsjahr

2017

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The meteorological input parameters for urban- and local-scale dispersion models can be evaluated by preprocessing meteorological observations, using a boundary-layer parameterisation model. This study presents a sensitivity analysis of a meteorological preprocessor model (MPP-FMI) that utilises readily available meteorological data as input. The sensitivity of the preprocessor to meteorological input was analysed using algorithmic differentiation (AD). The AD tool used was TAPENADE. The AD method numerically evaluates the partial derivatives of functions that are implemented in a computer program. In this study, we focus on the evaluation of vertical fluxes in the atmosphere and in particular on the sensitivity of the predicted inverse Obukhov length and friction velocity on the model input parameters. The study shows that the estimated inverse Obukhov length and friction velocity are most sensitive to wind speed and second most sensitive to solar irradiation. The dependency on wind speed is most pronounced at low wind speeds. The presented results have implications for improving the meteorological preprocessing models. AD is shown to be an efficient tool for studying the ranges of sensitivities of the predicted parameters on the model input values quantitatively. A wider use of such advanced sensitivity analysis methods could potentially be very useful in analysing and improving the models used in atmospheric sciences.