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RISA Case Study of Cyclogenesis Using a Model Hierarchy
Publisher: American Meteorological Society
Abstract: It is universally agreed that cyclogenesis in midlatitudes occurs through baroclinic conversion of the potential energy available from an initial state. The mechanical process by which that conversion takes place is a ...
The Effect of Linearization Errors on 4DVAR Data Assimilation
Publisher: American Meteorological Society
Abstract: The authors show that the linear approximation errors in the presence of a discontinuous convective parameterization operator are large for a small number of grid points where the noise produced by the convective ...
Sensitivity of Low-Level Winds Simulated by the WRF Model in California’s Central Valley to Uncertainties in the Large-Scale Forcing and Soil Initialization
Publisher: American Meteorological Society
Abstract: The sensitivity of the Weather and Research Forecasting (WRF) model-simulated low-level winds in the Central Valley (CV) of California to uncertainties in the atmospheric forcing and soil initialization is investigated ...
Behaviors of Variational and Nudging Assimilation Techniques with a Chaotic Low-Order Model
Publisher: American Meteorological Society
Abstract: Variational and nudging data-assimilation schemes are examined within the framework of a model initialization problem using the Lorenz three-component model of Rayleigh?Benard convection. Since the intent of this study is ...
An Adjoint Examination of a Nudging Method for Data Assimilation
Publisher: American Meteorological Society
Abstract: A regional adjoint modeling system is modified to determine the sensitivities of data assimilation and forecast results with respect to perturbations of the nudging fields and coefficients. A generalized linear system is ...
Evaluation of the Summertime Low-Level Winds Simulated by MM5 in the Central Valley of California
Publisher: American Meteorological Society
Abstract: A season-long set of 5-day simulations between 1200 UTC 1 June and 1200 UTC 30 September 2000 are evaluated using the observations taken during the Central California Ozone Study (CCOS) 2000 experiment. The simulations are ...
Is the Mass Sink Due to Precipitation Negligible?
Publisher: American Meteorological Society
Abstract: The significance of mass sinks (or sources) due to precipitation (or evaporation) is examined using numerical experiments performed with the Pennsylvania State University-National Center for Atmospheric Research Mesoscale ...
Numerical Simulation of the 1981 Sichuan Flood. Part I: Evolution of a Mesoscale Southwest Vortex
Publisher: American Meteorological Society
Abstract: During the period 11?15 July 1981, heavy rainfall occurred over the Sichuan Basin in China, resulting in severe floods that took a large toll in human life and property damage. Mesoscale analyses by Kuo, Cheng and Anthes ...
Using Initial Condition and Model Physics Perturbations in Short-Range Ensemble Simulations of Mesoscale Convective Systems
Publisher: American Meteorological Society
Abstract: Two separate numerical model ensembles are created by using model configurations with different model physical process parameterization schemes and identical initial conditions, and by using different model initial conditions ...
Revised Parameterization of Air–Sea Exchanges in High Winds for Operational Numerical Prediction: Impact on Tropical Cyclone Track, Intensity, and Rapid Intensification
Publisher: American Meteorological Society
Abstract: n high-wind conditions, sea spray, in conjunction with a generally decreasing drag coefficient for increasing winds, greatly modulates surface heat and momentum fluxes. It has been suggested that the process can be ...