Authors: KaiMing Huang ShaoDong Zhang Fan Yi ZeYu Chen
Publish Date: 2008/10/14
Volume: 54, Issue: 2, Pages: 288-295
Abstract
On the basis of previous parameterization schemes considering both the wave breaking and absorbed at critical level a parameterization with a continuous spectrum of gravity waves is realized by introducing a momentum flux density function for the wave spectrum and then the parameterization scheme of the gravity waves is improved Choosing parameter values of the background atmosphere and waves based on the observations a more realistic equatorial quasibiennial oscillation QBO driven by the incorporated drag from the planetary and gravity waves can be simulated The numerical results indicate that the forcing magnitude of the planetary and gravity waves varies with the wind field and in some phases of the QBO the contribution of the gravity waves is comparable with that of the planetary waves After the QBO is steadily formed its amplitude and period and wind configuration are relevant to the effect of vertical diffusion and the momentum flux distribution with spectrum however independent of the initial background wind field Moreover for any given nonzero initial background wind a steady QBO can be finally generated due to the incorporated drag from the planetary and gravity wavesSupported by National Natural Science Foundation of China Grant Nos 40731055 and 40774085 the Innovative Research Team Project Ministry of Education the Knowledge Innovation Program of the Chinese Academy of Sciences IAP07315 the China Meteorological Administration Grant No GYHY200706013 and the Open Programs of Key Laboratory of Geospace Environment and Geodesy Ministry of Education
Keywords: