Wave-Mean Flow Interaction: the Role of Continuous-Spectrum Disturbances |
| |
Authors: | Zeng Qingcun and Zhang Minghua |
| |
Institution: | Institute of Atmospheric Physics; Chinese Academy of Sciences; Beijing 100080,Institute for Terrestrial and Planetary Atmospheres; State University of New York at Stony Brook; Stony Brook; NY 11794-5000 |
| |
Abstract: | Traditionally, "eddy feeds zonal flow" in the atmosphere is considered as a result of decaying unstable waves. We show that disturbances made of non-modal solutions -the continuous-spectrum disturbances-can also effectively transport zonal angular momentum and interact with the zonal basic flow. These disturbances, though stable, eventually decay, losing their energy to strengthen the westerly jets in the atmosphere. Calculations with observational data illustrate that the atmospheric zonal flow is maintained primarily by continuous-spectrum disturbances rather than by unstable waves. Angular momentum transport by continuous-spectrum disturbances is one order of magnitude larger than that by all kinds of normal modes (referred as discreter-spectrum disturbances) including unstable waves. |
| |
Keywords: | Maintenance of zonal flow Continuous-spectrum Angular momentum Transport |
本文献已被 CNKI SpringerLink 等数据库收录! |
| 点击此处可从《大气科学进展》浏览原始摘要信息 |
| 点击此处可从《大气科学进展》下载免费的PDF全文 |