NP
Nonlinear Processes in Geosciences
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Tommaso Alberti

I am a researcher at the Istituto Nazionale di Geofisica e Vulcanologia (INGV) in Rome, Italy. My research has an inter-disciplinary character and it mainly focuses on the understanding of processes occurring in geosciences, space sciences, and complex systems at different spatio-temporal scales. My investigations revolve around several key areas as weather and climate extremes with impacts on aviation turbulence, airports closures due to the adverse weather conditions, Acqua Alta events in Venice, flooding events after huge storms; turbulence and dissipation in both fluids and plasmas; and tipping points to develop statistical methods for identifying transition thresholds in complex systems at bifurcation points at different spatio-temporal scales with application to climate and paleoclimate, turbulence, and epidemiology.

NP Campfire: “Scaling and multifractals : from historical perspectives to recent developments”

, and December 20, 2021
NP Campfire: “Scaling and multifractals : from historical perspectives to recent developments”
Adapted from G. Sarma et al. (1991).

Scaling law behaviours are ubiquitous in geosciences both from a theoretical and practical point of view. They are required to better understand, analyse and simulate the underlying processes, which yields the observed variability of geophysical fields over wide ranges of spatio-temporal scales. A group of scientists within the Nonlinear Processes in Geosciences (NP) Division of the European Geosc ...[Read More]

NP Interviews: the 2021 Lewis Fry Richardson Medal Berengere Dubrulle

, and November 15, 2021
NP Interviews: the 2021 Lewis Fry Richardson Medal Berengere Dubrulle

Today’s NP Interviews hosts the 2021 Lewis Fry Richardson Medal Berengere Dubrulle. Berengere is senior scientist at the Centre National de la Recherche Scientifique and presently Director of the Les Houches Physics School. She received her PhD in astrophysics in 1990 under the supervision of J.-P. Zahn. She is a specialist of turbulence, and its application to astro and geophysical flows using th ...[Read More]

#vEGU21 Networking events of the Nonlinear Processes in Geosciences (NP) Division

April 16, 2021
#vEGU21 Networking events of the Nonlinear Processes in Geosciences (NP) Division

The current COVID-19 situation has profoundly changed our daily lives and has also affected our way to perform and share research. In today’s world a lot of efforts have been made to minimize the impact of working from home and exchange thoughts with colleagues. As for last year the usual annual General Assembly of the European Geosciences Union (EGU) has been moved online. Thus, it will be virtua ...[Read More]

NPG Paper of the Month: “A methodology to obtain model-error covariances due to the discretization scheme from the parametric Kalman filter perspective”

March 11, 2021
NPG Paper of the Month: “A methodology to obtain model-error covariances due to the discretization scheme from the parametric Kalman filter perspective”
Illustration of the transport of a chemical specy by a heterogeneous wind field over a 1D domain (a) and the numerical simulation from a simple discretization scheme (b). The loss of variance due to the spurious numerical diffusion involves an increase of the model-error variance (c) which is coupled with the anisotropy (the correlation length-scale in 1D domain, in panel d).

The January 2021 NPG Paper of the Month award goes to Olivier Pannekoucke and his co-authors for the paper “A methodology to obtain model-error covariances due to the discretization scheme from the parametric Kalman filter perspective“. In geophysics, forecasting is based on solving the equations of physics with the help of a computer. To calculate a forecast we need an initial conditi ...[Read More]