The roles of planetary and gravity waves during a major stratospheric sudden warming as characterized in WACCM

详细信息	查看全文 | 推荐本文 |

• 作者：Varavut Limpasuvan^a ; ^{var@coastal.edu} ; Jadwiga H. Richter^b ; Yvan J. Orsolini^c ; Frode Stordal^d ; Ole-Kristian Kvissel^d
• 关键词：Stratospheric sudden warming ; Middle atmospheric circulation ; Planetary waves ; Gravity waves ; Middle atmospheric modeling
• 刊名：Journal of Atmospheric and Solar-Terrestrial Physics
• 出版年：2012
• 期刊代码：41_13646826
• 类别：ear
• 出版时间：April, 2012
• 卷：78-79
• 期：Complete
• 页码：84-98
• 文件大小：16747 K

摘要

The roles of planetary waves (PWs) and gravity waves (GWs) are examined during a realistic major stratospheric sudden warming (SSW), simulated in the National Center for Atmospheric Research Whole Atmosphere Community Climate Model (WACCM). This major SSW event is characterized by a well-separated polar stratopause during a wind-reversal period. Formed by adiabatic warming induced by westward GW drag, the early-winter stratopause layer appears at its climatological level. With the incipient wind reversal and SSW onset, this layer plunges 鈭?0 km in time, as the amplified PW interacts with the mean flow. The SSW recovery starts in the upper mesosphere as GW drag becomes eastward due to the filtering effects of the underlying wind. During this recovery, the stratopause reforms at an elevated altitude due to adiabatic warming induced by strong upper mesospheric PW forcing. Intensified downward motion from the mesosphere then ensues as the stratopause descends toward its climatological position.