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| DOI | 10.1007/s00382-021-05735-7 |
| Maintenance of the South Asian jet wave train: eddy kinetic energy balance | |
| Li X. | |
| 发表日期 | 2021 |
| ISSN | 0930-7575 |
| 起始页码 | 253 |
| 结束页码 | 267 |
| 英文摘要 | The mechanisms of the propagation and maintenance of the South Asian jet wave train are investigated in this study by examining the eddy kinetic energy (EKE) balance along the wave train. The intensity and evolution of the disturbances along the wave train can be well represented by the variation of EKE centers. The east-to-west discrepancy in the intensity of EKE centers indicates the wave train is not only maintained by the waveguide effect of the jet stream, but also fueled and damped by other physical processes along the wave train. It is found that both baroclinic and barotropic conversions are key energy sources during the lifespan of the wave train, characterized by regional differences. They evolve with the eddies and are offset mainly by energy exported by the ageostrophic geopotential fluxes after the peak of the eddies. They are strong upstream of the wave train, as extremely strong cooling/warming advection appears behind/ahead of the trough over the eastern Mediterranean Sea-Middle East where abnormal descent/ascent occurs, and potential energy is transformed into kinetic energy. As this trough tilts southwestward, kinetic energy can be converted from the mean flow to eddies on the north flank of the South Asian jet. Strong dissipation occurs over the Middle East, which might be responsible for the relatively weaker EKE centers downstream. Over China, the eddy is fueled by strong barotropic conversion again, as a result of the northward shift of the jet axis. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature. |
| 英文关键词 | Baroclinic conversion; Barotropic conversion; Eddy kinetic energy balance; Maintenance mechanisms; South Asian jet wave train |
| 来源期刊 | Climate Dynamics
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/183514 |
| 作者单位 | School of Atmospheric Sciences, Sun Yat-sen University, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China; Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Zhuhai, China; Jiangsu Collaborative Innovation Center for Climate Change, Nanjing, China |
| 推荐引用方式 GB/T 7714 | Li X.. Maintenance of the South Asian jet wave train: eddy kinetic energy balance[J],2021. |
| APA | Li X..(2021).Maintenance of the South Asian jet wave train: eddy kinetic energy balance.Climate Dynamics. |
| MLA | Li X.."Maintenance of the South Asian jet wave train: eddy kinetic energy balance".Climate Dynamics (2021). |
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