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RISGeneration of Subsynoptic-Scale Unstable Baroclinic Waves by Surface Friction
Publisher: American Meteorological Society
Abstract: Inclusion of surface drag produces an additional growth rate peak at Lx ≈ 1000 km, even if the curvature (d2?/dZ2) of the basic zonal wind profile is not favorable and diabatic heating due to the liberation of latent heat ...
Precipitation and Water Vapor Transport in the Southern Hemisphere with Emphasis on the South American Region
Publisher: American Meteorological Society
Abstract: December?March climatologies of precipitation and vertically integrated water vapor transport were analyzed and compared to find the main paths by which moisture is fed to high-rainfall regions in the Southern Hemisphere ...
Performance Evaluation Statistics Applied to Derived Fields of NWP Model Forecasts
Publisher: American Meteorological Society
Abstract: NWP model skill as obtained from the standard statistics applied to derived atmospheric fields such as thermal advection and moisture convergence is different from that obtained by the same statistics applied to basic model ...
Dynamical and Synoptic Characteristics of Heavy Rainfall Episodes in Southern Brazil
Publisher: American Meteorological Society
Abstract: The dynamical and synoptic characteristics that distinguish heavy rainfall episodes from nonheavy rainfall episodes in southern Brazil are discussed. A heavy rainfall episode is defined here as one in which the 50 mm day?1 ...
Interseasonal and Interbasins Hydrological Coupling in South America
Publisher: American Meteorological Society
Evolution of the Lorenz Energy Cycle in the Intertropical Convergence Zone in the South American Sector of the Atlantic Ocean
Publisher: American Meteorological Society
Abstract: he intertropical convergence zone (ITCZ) in the South American sector of the Atlantic Ocean is identified using outgoing longwave radiation (OLR) data in order to investigate the evolution of the Lorenz energy cycle in the ...
Climatological Lower Tropospheric Frontogenesis in the Midlatitudes Due to Horizontal Deformation and Divergence
Publisher: American Meteorological Society
Abstract: The frontogenetic function given by Petterssen is calculated for the four months, January, April, July and October and the year as a whole using the climatological wind and temperature data for 85 and 70 kPa levels over ...
Trends in the Frequency of Intense Precipitation Events in Southern and Southeastern Brazil during 1960–2004
Publisher: American Meteorological Society
Abstract: new approach to define heavy and extreme rainfall events based on cluster analysis and area-average rainfall series is presented. The annual frequency of the heavy and extreme rainfall events is obtained for the southeastern ...
Simulations of the Summer Circulation over the South American Region with an Eta Coordinate Model
Publisher: American Meteorological Society
Abstract: A multilevel limited-area primitive equations model in eta coordinate is used to simulate the effects of the Amazonian latent heat source and the Andean topography on the summer (December, January, February) circulation ...
Cold Surges in Tropical and Extratropical South America: The Strong Event in June 1994
Publisher: American Meteorological Society
Abstract: The authors investigate one case of surges of polar air that occasionally propagate into southeastern Brazil during wintertime and are harmful to coffee production because of the freezing conditions associated with them. ...