Turbulent kinetic energy dissipation rate and eddy diffusivity study in the tropical mesosphere using Jicamarca radar data

• Autor: Guo, Liyu
• Formato: tesis de maestría
• Fecha de Publicación: 2006
• Institución: Instituto Geofísico del Perú
• Repositorio: IGP-Institucional
• Lenguaje: inglés
• OAI Identifier: oai:repositorio.igp.gob.pe:20.500.12816/4488
• Enlace del recurso: http://hdl.handle.net/20.500.12816/4488
• Nivel de acceso: acceso abierto
• Materia: Radar; Kinetic energy; Turbulence; Mesosphere; http://purl.org/pe-repo/ocde/ford#1.03.00; http://purl.org/pe-repo/ocde/ford#1.05.01

The MST radar at Jicamarca Radar Observatory JRO is a powerful radar that can detect atmospheric turbulence on the Bragg scale of 3 m in the daytime mesosphere 60-85 km Since 2002 the radar was operated for a few days each year in the mode that collecting 1 minute Doppler spectra in four beam directions and 150 m resolution The spectral widths along with GSWM MSIS and SABER temperatures have been used to compute the kinetic energy dissipation rate due to atmospheric turbulence Eddy diffusivities K have also been calculated A small contamination due to beam broadening beam width 0 7 degree has been removed For most days median kinetic energy dissipation values of 1-10 mW kg increase with height consistent with the results from other VHF radars The variability during each day is large Turbulent dissipation rates and eddy diffusivities for individual layers and the day-to-day variability are discussed in relationship with the observed wind shear and estimated Richardson number.