Ensemble size: How suboptimal is less than infinity?

M Leutbecher - Quarterly Journal of the Royal Meteorological …, 2019 - Wiley Online Library
Ensemble forecasts are the method of choice in numerical weather prediction (NWP) to
generate probabilistic forecasts. The number of members in an ensemble is an important …

Introduction to the special issue on “25 years of ensemble forecasting”

R Buizza - Quarterly Journal of the Royal Meteorological …, 2019 - Wiley Online Library
Twenty‐five years ago the first operational, ensemble forecasts were issued by the
European Centre for Medium‐Range Weather Forecasts and the National Centers for …

Revision of the stochastically perturbed parametrisations model uncertainty scheme in the integrated forecasting system

STK Lang, SJ Lock, M Leutbecher… - Quarterly Journal of …, 2021 - Wiley Online Library
Abstract The Stochastically Perturbed Parametrisations scheme (SPP) represents model
uncertainty in numerical weather prediction by introducing stochastic perturbations into the …

[HTML][HTML] Observations and simulation of intense convection embedded in a warm conveyor belt–how ambient vertical wind shear determines the dynamical impact

A Oertel, M Sprenger, H Joos… - Weather and Climate …, 2021 - wcd.copernicus.org
Warm conveyor belts (WCBs) are dynamically important, strongly ascending and mostly
stratiform cloud-forming airstreams in extratropical cyclones. Despite the predominantly …

Understanding changes of the continuous ranked probability score using a homogeneous Gaussian approximation

M Leutbecher, T Haiden - Quarterly Journal of the Royal …, 2021 - Wiley Online Library
Improving ensemble forecasts is a complex process which involves proper scores such as
the continuous ranked probability score (CRPS). A homogeneous Gaussian (hoG) model is …

Huge Ensembles Part II: Properties of a Huge Ensemble of Hindcasts Generated with Spherical Fourier Neural Operators

A Mahesh, W Collins, B Bonev, N Brenowitz… - arxiv preprint arxiv …, 2024 - arxiv.org
In Part I, we created an ensemble based on Spherical Fourier Neural Operators. As initial
condition perturbations, we used bred vectors, and as model perturbations, we used multiple …

[HTML][HTML] Robust data assimilation with noise: Applications to cardiac dynamics

CD Marcotte, FH Fenton, MJ Hoffman… - … Journal of Nonlinear …, 2021 - pubs.aip.org
Reconstructions of excitation patterns in cardiac tissue must contend with uncertainties due
to model error, observation error, and hidden state variables. The accuracy of these state …

Ensemble size dependence of the logarithmic score for forecasts issued as multivariate normal distributions

M Leutbecher, S Baran - Quarterly Journal of the Royal …, 2024 - Wiley Online Library
Multivariate probabilistic verification is concerned with the evaluation of joint probability
distributions of vector quantities such as a weather variable at multiple locations or a wind …

Identifying Efficient Ensemble Perturbations for Initializing Subseasonal‐To‐Seasonal Prediction

J Demaeyer, SG Penny… - Journal of Advances in …, 2022 - Wiley Online Library
The prediction of the weather at subseasonal‐to‐seasonal (S2S) timescales is dependent
on both initial and boundary conditions. An open question is how to best initialize a relatively …

Assessment of NCMRWF Global Ensemble System with differing ensemble populations for Tropical cyclone prediction

P Chakraborty, A Sarkar, S Kumar, JP George… - Atmospheric …, 2020 - Elsevier
Abstract Ensemble Prediction System (EPS) estimates the probability distribution of
atmospheric states through multiple integrations of the Numerical Weather Prediction (NWP) …