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Modelling collocation uncertainty of 3D atmospheric profiles

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Abstract

Atmospheric thermodynamic data are gathered by high technology remote instruments such as radiosondes, giving rise to profiles that are usually modelled as functions depending only on height. The radiosonde balloons, however, drift away in the atmosphere resulting in not necessarily vertical but three-dimensional trajectories. To model this kind of functional data, we introduce a “point based” formulation of an heteroskedastic functional regression model that includes a trivariate smooth function and results to be an extension of a previously introduced unidimensional model. Functional coefficients of both the conditional mean and variance are estimated by reformulating the model as a standard generalized additive model and subsequently as a mixed model. This reformulation leads to a double mixed model whose parameters are fitted by using an iterative algorithm that allows to adjust for heteroskedasticity. The proposed modelling approach is applied to describe collocation mismatch when we deal with couples of balloons launched at two different locations. In particular, we model collocation error of atmospheric pressure in terms of meteorological covariates and space and time mismatch. Results show that model fitting is improved once heteroskedasticity is taken into account.

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Acknowledgments

The authors would like to thank Belay Demoz and Fabio Madonna for useful discussions and comments and two anonymous referees whose comments and suggestions improved the reading and quality of the manuscript.

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Authors and Affiliations

  1. Dipartimento di Economia e Statistica “Cognetti de Martiis”, Università degli Studi di Torino, Torino, Italy

    Rosaria Ignaccolo

  2. Università degli Studi di Torino, Torino, Italy

    Maria Franco-Villoria

  3. Università degli Studi di Bergamo, Bergamo, Italy

    Alessandro Fassò

Authors
  1. Rosaria Ignaccolo
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  2. Maria Franco-Villoria
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  3. Alessandro Fassò
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Corresponding author

Correspondence to Rosaria Ignaccolo.

Additional information

Work partially supported by FIRB 2012 grant (project no. RBFR12URQJ) provided by the Italian Ministry of Education, Universities and Research.

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Ignaccolo, R., Franco-Villoria, M. & Fassò, A. Modelling collocation uncertainty of 3D atmospheric profiles. Stoch Environ Res Risk Assess 29, 417–429 (2015). https://doi.org/10.1007/s00477-014-0890-7

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  • DOI: https://doi.org/10.1007/s00477-014-0890-7

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