Simulation of the equatorial quasi-biennial oscillation based on the parameterization of continuously spectral gravity waves  

作　　者：HUANG KaiMing ZHANG ShaoDong ,YI Fan CHEN ZeYu 

机构地区：[1]School of Electronic Information, Wuhan University, Wuhan 430079, China [2]Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan 430079, China [3]State Observatory for Atmospheric Remote Sensing, Wuhan 430079, China [4]Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China

出　　处：《Chinese Science Bulletin》2009年第2期288-295,共8页

基　　金：Supported 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);the Open Programs of Key Laboratory of Geospace Environment and Geodesy, Ministry of Education

摘　　要：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 quasi-biennial 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 waves.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 quasi-biennial 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 waves.

关 键 词：大气科学 重力波 中间层 低热层 大气环流 

分 类 号：P4[天文地球—大气科学及气象学]