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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union

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Nonlin. Processes Geophys., 24, 227-235, 2017
https://doi.org/10.5194/npg-24-227-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
24 May 2017
Influence of finite-time Lyapunov exponents on winter precipitation over the Iberian Peninsula
Daniel Garaboa-Paz1, Nieves Lorenzo2, and Vicente Pérez-Muñuzuri1 1Group of Nonlinear Physics, Faculty of Physics, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
2Ephyslab, Faculty of Sciences, Campus de Ourense, University of Vigo, 32004 Ourense, Spain
Abstract. Seasonal forecasts have improved during the last decades, mostly due to an increase in understanding of the coupled ocean–atmosphere dynamics, and the development of models able to predict the atmosphere variability. Correlations between different teleconnection patterns and severe weather in different parts of the world are constantly evolving and changing. This paper evaluates the connection between winter precipitation over the Iberian Peninsula and the large-scale tropospheric mixing over the eastern Atlantic Ocean. Finite-time Lyapunov exponents (FTLEs) have been calculated from 1979 to 2008 to evaluate this mixing. Our study suggests that significant negative correlations exist between summer FTLE anomalies and winter precipitation over Portugal and Spain. To understand the mechanisms behind this correlation, summer anomalies of the FTLE have also been correlated with other climatic variables such as the sea surface temperature (SST), the sea level pressure (SLP) or the geopotential. The East Atlantic (EA) teleconnection index correlates with the summer FTLE anomalies, confirming their role as a seasonal predictor for winter precipitation over the Iberian Peninsula.

Citation: Garaboa-Paz, D., Lorenzo, N., and Pérez-Muñuzuri, V.: Influence of finite-time Lyapunov exponents on winter precipitation over the Iberian Peninsula, Nonlin. Processes Geophys., 24, 227-235, https://doi.org/10.5194/npg-24-227-2017, 2017.
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Short summary
This paper evaluates the connection between winter precipitation over the Iberian Peninsula and the large-scale tropospheric mixing over the eastern Atlantic Ocean. Finite-time Lyapunov exponents (FTLEs) have been calculated from 1979 to 2008 to evaluate this mixing. Our study suggests that significant negative correlations exist between summer FTLE anomalies and winter precipitation over Portugal and Spain.
This paper evaluates the connection between winter precipitation over the Iberian Peninsula and...
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