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RISSurface Pressure Drag for Hydrostatic Two-Layer Flow over Axisymmetric Mountains
Publisher: American Meteorological Society
Abstract: The effect of partial reflections on surface pressure drag is investigated for hydrostatic gravity waves in two-layer flow with piecewise constant buoyancy frequency. The variation of normalized surface pressure drag with ...
On Ensemble Prediction Using Singular Vectors Started from Forecasts
Publisher: American Meteorological Society
Abstract: The impact on the ECMWF Ensemble Prediction System of using singular vectors computed from 12-h forecasts instead of analyses has been studied. Results are based on 34 cases in November?December 1999 and 28 cases in September ...
The Propagation of Mountain Waves into the Stratosphere: Quantitative Evaluation of Three-Dimensional Simulations
Publisher: American Meteorological Society
Abstract: On 6 January 1992 measurements of a mountain wave with significant amplitude were taken over the southern tip of Greenland during an ER-2 flight at an altitude of about 20 km. This work focuses on 3D numerical simulations ...
Comparison between Singular Vectors and Breeding Vectors as Initial Perturbations for the ECMWF Ensemble Prediction System
Publisher: American Meteorological Society
Abstract: In this paper a study aimed at comparing the perturbation methodologies based on the singular vector ensemble prediction system (SV-EPS) and the breeding vector ensemble prediction system (BV-EPS) in the same model environment ...
A Reduced Radiation Grid for the ECMWF Integrated Forecasting System
Publisher: American Meteorological Society
Abstract: A specific interface between the radiation transfer calculations and the rest of the ECMWF model was introduced in 2003, potentially providing substantial economy in computer time by reducing the spatial resolution at which ...
New Methods for Data Storage of Model Output from Ensemble Simulations
Publisher: American Meteorological Society
Abstract: Data storage and data processing generate significant cost for weather and climate modeling centers. The volume of data that needs to be stored and data that are disseminated to end users increases with increasing model ...
The Impact of Moist Singular Vectors and Horizontal Resolution on Short-Range Limited-Area Ensemble Forecasts for Two European Winter Storms
Publisher: American Meteorological Society
Abstract: This paper studies the impact of different initial condition perturbation methods and horizontal resolutions on short-range limited-area ensemble predictions for two severe winter storms. The methodology consists of 51-member ...
Impact of the Mesoscale Range on Error Growth and the Limits to Atmospheric Predictability
Publisher: American Meteorological Society
Abstract: Global numerical weather prediction (NWP) models have begun to resolve the mesoscale k−5/3 range of the energy spectrum, which is known to impose an inherently finite range of deterministic predictability per se as errors ...
Sensitivity, Structure, and Dynamics of Singular Vectors Associated with Hurricane Helene (2006)
Publisher: American Meteorological Society
Abstract: he sensitivity of singular vectors (SVs) associated with Hurricane Helene (2006) to resolution and diabatic processes is investigated. Furthermore, the dynamics of their growth are analyzed. The SVs are calculated using ...
Single Precision in Weather Forecasting Models: An Evaluation with the IFS
Publisher: American Meteorological Society
Abstract: arth?s climate is a nonlinear dynamical system with scale-dependent Lyapunov exponents. As such, an important theoretical question for modeling weather and climate is how much real information is carried in a model?s ...