NPG Paper of the Month

NPG Paper of the Month: “Correcting for model changes in statistical postprocessing – an approach based on response theory”

Tommaso Alberti July 22, 2020

Mean square error (MSE) evolution between the different forecasts and their correction and reality. Credits: Demaeyer, J. and Vannitsem, S.: Correcting for model changes in statistical postprocessing – an approach based on response theory, Nonlin. Processes Geophys., 27, 307–327, https://doi.org/10.5194/npg-27-307-2020, 2020.

This month the NPG Paper of the Month award is achieved by Jonathan Deameyer and Stéphane Vannitsem for their paper “Correcting for model changes in statistical postprocessing – an approach based on response theory” (https://doi.org/10.5194/npg-27-307-2020). Jonathan did his PhD in statistical mechanics at the Université Libre de Bruxelles under the supervision of Pierre Gaspard and he is currentl ...[Read More]

NPG Paper of the Month: “Detecting dynamical anomalies in time series from different palaeoclimate proxy archives using windowed recurrence network analysis”

Tommaso Alberti June 30, 2020

Recurrence network transitivity (colour-coded) for a Lorenz-63 system with linear parameter drift as input signal, and the output of four different proxy system models with an areawise significance test (contours). The vertical lines denote the approximate positions of transient bifurcations between different types of dynamics at b = 161.0 and b = 166.5 as described in Donges et al., Nonlin. Processes Geophys., 2011. Credits: Detecting dynamical anomalies in time series from different palaeoclimate proxy archives using windowed recurrence network analysis (https://npg.copernicus.org/articles/27/261/2020/).

This month the NPG Paper of the Month award is achieved by Jaqueline Lekscha and Reik Donner for their paper “Detecting dynamical anomalies in time series from different palaeoclimate proxy archives using windowed recurrence network analysis” (https://npg.copernicus.org/articles/27/261/2020/). Jaqueline Lekscha did her PhD in physics at the Potsdam Institute for Climate Impact Research and Humbold ...[Read More]

NPG Paper of the Month: “Application of a local attractor dimension to reduced space strongly coupled data assimilation for chaotic multiscale systems”

Tommaso Alberti April 23, 2020

Local dynamical properties of a segment of an example run for the coupled Lorenz system. (a) Alignment of directions of error growth plotted along the x coordinate of the ocean subsystem. Large orange stars indicate high alignment of error growth in the unstable or neutral subspaces. (b) Finite-time Lyapunov exponents (FTLEs) computed over window τ = 4. (c) Local Kaplan-Yorke dimension calculated from FTLEs. (Source: Quinn, O’Kane, and Kitsios, Application of a local attractor dimension to reduced space strongly coupled data assimilation for chaotic multiscale systems, Nonlin. Processes Geophys., 27, 51–74, 2020, https://www.nonlin-processes-geophys.net/27/51/2020/. License: https://creativecommons.org/licenses/by-nc-nd/4.0/.

This month the NPG Paper of the Month award is achieved by Courtney Quinn for her paper “Application of a local attractor dimension to reduced space strongly coupled data assimilation for chaotic multiscale systems” (https://www.nonlin-processes-geophys.net/27/51/2020/). Dr. Courtney obtained her PhD in Mathematics at the University of Exeter (UK) researching critical transitions in dynamical syst ...[Read More]

NPG Paper of the Month: “On fluctuating momentum-exchange in idealised models of air-sea interaction”

Tommaso Alberti February 3, 2020

Probability density function of the energy (normalized so that the average is unity for each variable) lost by the atmosphere and gained by the ocean at t=300 and averaging time τ=0, atmosphere full-line, ocean dashed-line, and for averaging time τ=100, atmosphere dotted-line, ocean dashed-dotted-line. All are clearly non-Gaussian. (Source: A. Wirth, On fluctuating momentum exchange in idealised models of air–sea interaction, Nonlin. Processes Geophys., 26, 457–477, https://www.nonlin-processes-geophys.net/26/457/2019/. License: https://creativecommons.org/licenses/by-nc-nd/4.0/.

This month the NPG Paper of the Month award is achieved by Achim Wirth for his paper “On fluctuating momentum-exchange in idealised models of air-sea interaction” (https://www.nonlin-processes-geophys.net/26/457/2019/). Achim tells us about the importance of the results achieved with this paper for investigating the energy coupling between the ocean and the atmosphere. Achim obtained his PhD at th ...[Read More]