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RISA Modeling Study and Scaling Analysis of Orographic Effects on Boundary Layer Shallow Convection
Publisher: American Meteorological Society
Abstract: Effects of orography on boundary layer shallow convection under various background winds are studied using a two-dimensional model together with scaling analysis. Under a motionless background state the flow response over ...
Conditional Convective Heating in a Baroclinic Atmosphere: A Model of Convective Frontogenesis
Publisher: American Meteorological Society
Abstract: It is shown here that there exists a regime of balanced frontogenesis that is forced almost entirely by the diabatic hating due to convection at a front. This theory is explored in the context of the two-dimensional ...
The Two-Dimensional Response of a Tropical Jet to Propagating Lines of Convection
Publisher: American Meteorological Society
Abstract: This paper uses simple one- and two-dimensional models to investigate the influence of a propagating line of convective forcing on a tropical jet, representative of the African easterly jet. The results are used to infer ...
On the Mesoscale Structure of Surface Wind and Pressure Fields near Tornadic and Nontornadic Cold Fronts
Publisher: American Meteorological Society
Abstract: bservations from a mesoscale network of automatic weather stations are analyzed for 15 U.K. cold fronts exhibiting narrow cold frontal rainbands (NCFRs). Seven of the NCFRs produced tornadoes. A time-compositing approach ...
What is the Mechanism for the Modification of Convective Cloud Distributions by Land Surface–Induced Flows?
Publisher: American Meteorological Society
Abstract: The aim of this study is to determine the mechanism that modulates the initiation of convection within convergence zones caused by land surface?induced mesoscale flows. An idealized modeling approach linked quantitatively ...
Observations and Numerical Simulation of Atmospheric Cellular Convection over Mesoscale Topography
Publisher: American Meteorological Society
Abstract: Radar and satellite images provide observations of convective rolls and other structures in the convective boundary layer (CBL), but the data are intermittent, and neither radar nor satellite gives a complete picture of ...
The Drying Out of Soil Moisture following Rainfall in a Numerical Weather Prediction Model and Implications for Malaria Prediction in West Africa
Publisher: American Meteorological Society
Abstract: This paper investigates the response of the land surface and the lowest section of the atmospheric surface layer to rainfall events and through the subsequent drying out period. The impacts of these sequences of rainfall ...
Observing Coherent Boundary Layer Motions Using Remote Sensing and Surface Pressure Measurement
Publisher: American Meteorological Society
Abstract: In this paper, high-frequency pressure time series measured by microbarographs are used to extract information on the existence and characteristics of convective rolls in the convective boundary layer. Rolls are identified ...
African Monsoon Multidisciplinary Analysis: An International Research Project and Field Campaign
Publisher: American Meteorological Society
Abstract: African Monsoon Multidisciplinary Analysis (AMMA) is an international project to improve our knowledge and understanding of the West African monsoon (WAM) and its variability with an emphasis on daily-to-interannual time ...