Results 71 to 80 of about 1,864 (260)

Regional modelling of tracer transport by tropical convection – Part 1: Sensitivity to convection parameterization [PDF]

Atmospheric Chemistry and Physics, 2009
The general objective of this series of papers is to evaluate long duration limited area simulations with idealised tracers as a tool to assess tracer transport in chemistry-transport models (CTMs).
J. Arteta, V. Marécal, E. D. Rivière
doaj  

Application of the concept of blending height to the calculation of surface fluxes in a mesoscale model

Meteorologische Zeitschrift, 1996
The concept of blending height is implemented into the nonhydrostatic mesoscale transport and flow model METRAS for the calculation of grid averaged subgrid scale surface fluxes of momentum, heat and moisture over flat terrain with different land-use ...
K. von Salzen, M. M. Claussen, K. H. Schlünzen   +2 more
doaj   +1 more source

Epistemic and aleatoric uncertainty quantification in weather and climate models

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Aleatoric and epistemic uncertainties over time on weather and climate time‐scales, estimated through ensembles that sample aleatoric and epistemic uncertainty using Bayesian neural networks for parameterisations in the Lorenz 1996 model. The spread shows the 16th and 84th percentiles.
Laura A. Mansfield, Hannah M. Christensen   +1 more
wiley   +1 more source

Ensemble reliability and the signal‐to‐noise paradox in ECMWF subseasonal forecasts

Quarterly Journal of the Royal Meteorological Society, EarlyView.
We derive a general expression for the ratio of predictable components (RPC) in terms of correlation, spread–error ratio, and total variance ratio. Physical constraints on the admissible solutions (i.e., real‐valued and non‐negative variances) provide a mechanism to identify statistically paradoxical sample combinations of reliability and correlation ...
Christopher D. Roberts, Frederic Vitart
wiley   +1 more source

A Parameterization for Cloud Organization and Propagation by Evaporation‐Driven Cold Pool Edges

Journal of Advances in Modeling Earth Systems
When the negatively buoyant air in the cloud downdrafts reaches the surface, it spreads out horizontally, producing cold pools. A cold pool can trigger new convective cells. However, when combined with the ambient vertical wind shear, it can also connect
Saulo R. Freitas, Georg A. Grell, Angel D. Chovert, Maria Assunção F. Silva Dias, Ernani deLima Nascimento   +4 more
doaj   +1 more source

Numerical simulation and physical understanding of a locally initiated sea fog event over the eastern Yellow Sea with a transition of air–sea temperature difference

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Unexpected sea fog in the west coast of South Korea had a huge impact on the transportations in the Seoul–Incheon metropolitan area. We reproduced successfully the formation and evolution of a sea event with a transition of air–sea temperature difference using the Weather Research and Forecasting model.
Jeonghoe Kim, Jung‐Hoon Kim, Clive E. Dorman, Harindra J. S. Fernando   +3 more
wiley   +1 more source

LMDZ6A: The Atmospheric Component of the IPSL Climate Model With Improved and Better Tuned Physics

Journal of Advances in Modeling Earth Systems, 2020
This study presents the version of the LMDZ global atmospheric model used as the atmospheric component of the Institut Pierre Simon Laplace coupled model (IPSL‐CM6A‐LR) to contribute to the 6th phase of the international Coupled Model Intercomparison ...
Frédéric Hourdin, Catherine Rio, Jean‐Yves Grandpeix, Jean‐Baptiste Madeleine, Frédérique Cheruy, Nicolas Rochetin, Arnaud Jam, Ionela Musat, Abderrahmane Idelkadi, Laurent Fairhead, Marie‐Alice Foujols, Lidia Mellul, Abdoul‐Khadre Traore, Jean‐Louis Dufresne, Olivier Boucher, Marie‐Pierre Lefebvre, Ehouarn Millour, Etienne Vignon, Jean Jouhaud, F. Bint Diallo, François Lott, Guillaume Gastineau, Arnaud Caubel, Yann Meurdesoif, Josefine Ghattas   +24 more
doaj   +1 more source

Scale dependence of the marine atmospheric boundary‐layer response to ocean surface‐temperature variability in the EUREC4$$ {\mathrm{EUREC}}^4 $$A region

Quarterly Journal of the Royal Meteorological Society, EarlyView.
With a minimal physics model and a high‐resolution fully 3D simulation, we demonstrate that the marine atmospheric boundary layer (MABL) response to sea‐surface temperature (SST) variability displays a dependence on the horizontal scales of motion.
Alessandro Storer, Matteo Borgnino, Claudia Pasquero, Agostino Niyonkuru Meroni   +3 more
wiley   +1 more source

EnKF and expectation‐maximization based parameter estimation of a convective gravity‐wave parameterization using Strateole 2 constant‐level balloon data

Quarterly Journal of the Royal Meteorological Society, EarlyView.
An offline methodology is applied to estimate parameters of a convective gravity‐wave scheme using momentum flux (MF) observations from constant‐level balloons (left panels: pdfs of east and west MFs in green from observations and black from EnKF). The approach integrates an ensemble Kalman filter with an expectation‐maximization algorithm and permits ...
F. Lott, P. Tandeo, M. Pulido, D. Bardet
wiley   +1 more source

Beyond the Training Data: Confidence‐Guided Mixing of Parameterizations in a Hybrid AI‐Climate Model

Journal of Advances in Modeling Earth Systems
Persistent systematic errors in Earth system models (ESMs) arise from difficulties in representing the full diversity of subgrid, multiscale atmospheric convection and turbulence.
Helge Heuer, Tom Beucler, Mierk Schwabe, Julien Savre, Manuel Schlund, Veronika Eyring   +5 more
doaj   +1 more source