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DOI | 10.1002/2017JD027460 |
Secondary Gravity Waves in the Winter Mesosphere: Results From a High-Resolution Global Circulation Model | |
Becker, Erich1; Vadas, Sharon L.2 | |
2018-03-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:5页码:2605-2627 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; USA |
英文摘要 | This study analyzes a new high-resolution general circulation model with regard to secondary gravity waves in the mesosphere during austral winter. The model resolves gravity waves down to horizontal and vertical wavelengths of 165 and 1.5km, respectively. The resolved mean wave drag agrees well with that from a conventional model with parameterized gravity waves up to the midmesosphere in winter and up to the upper mesosphere in summer. About half of the zonal-mean vertical flux of westward momentum in the southern winter stratosphere is due to orographic gravity waves. The high intermittency of the primary orographic gravity waves gives rise to secondary waves that result in a substantial eastward drag in the winter mesopause region. This induces an additional eastward maximum of the mean zonal wind at z approximate to 100km. Radar and lidar measurements at polar latitudes and results from other high-resolution global models are consistent with this finding. Hence, secondary gravity waves may play a significant role in the general circulation of the winter mesopause region. Plain Language Summary We present a new gravity-resolving general circulation model that extends into the lower thermosphere. The simulated summer-to-winter-pole circulation in the upper mesosphere is nearly realistic and driven by resolved waves. We find a new phenomenon that results from the generation of secondary gravity waves in the stratosphere and lower mesosphere. The effect is characterized by an eastward gravity drag that causes a secondary eastward wind maximum around the polar winter mesopause. Analysis of the simulated gravity waves shows consistence with other gravity wave resolving models and with observational studies of the austral winter middle atmosphere, including the mesopause region. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000428437100014 |
WOS关键词 | LOCAL BODY FORCES ; MIDDLE-ATMOSPHERE ; LIDAR OBSERVATIONS ; LOWER THERMOSPHERE ; CLIMATE MODELS ; GENERATION ; BREAKING ; PERIODS ; ENERGY ; RADAR |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/32170 |
专题 | 气候变化 |
作者单位 | 1.Leibniz Inst Atmospher Phys, Kuhlungsborn, Germany; 2.Northwest Res Associates, Boulder, CO USA |
推荐引用方式 GB/T 7714 | Becker, Erich,Vadas, Sharon L.. Secondary Gravity Waves in the Winter Mesosphere: Results From a High-Resolution Global Circulation Model[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(5):2605-2627. |
APA | Becker, Erich,&Vadas, Sharon L..(2018).Secondary Gravity Waves in the Winter Mesosphere: Results From a High-Resolution Global Circulation Model.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(5),2605-2627. |
MLA | Becker, Erich,et al."Secondary Gravity Waves in the Winter Mesosphere: Results From a High-Resolution Global Circulation Model".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.5(2018):2605-2627. |
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