Santosh Kumar Mishra | National Center Medium Range Weather Forcasting - Índia

• Grant number: 04/03748-7
• Support Opportunities: Research Grants - Visiting Researcher Grant - International
• Start date: October 01, 2004
• End date: September 30, 2005
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Meteorology
• Principal Investigator: Sergio Henrique Franchito
• Grantee: Sergio Henrique Franchito
• Visiting researcher: Santosh Kumar Mishra
• Visiting researcher institution: National Centre for Medium Range Weather Forecasting, India
• Host Institution: Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia e Inovação (Brasil). São José dos Campos , SP, Brazil

Abstract

The upper tropospheric synoptic scale cyclonic vortices induce rainfall over northeast Brazil. It is proposed to investigate barotropic stability characteristics of representative zonal and non-zonal flows in the upper troposphere before the vortex formation. Computed spatial and temporal scales, structure, energetics and transports associated with the preferred unstable modes will be compared with observations. A 3-layer linear, equatorial beta plane, barotropic primitive equation model and a global barotropic primitive equation model over sphere will be used for the proposed studies. It is suggested to use eigenvalue as well as initial value approaches to determine unstable modes. It is expected that the proposed studies will provide a dynamical framework to understand genesis, intensification and movement of cyclonic vortex over northeast Brazil. (AU)