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DOI | 10.1007/s00382-016-3215-3 |
Roles of convective heating and boundary-layer moisture asymmetry in slowing down the convectively coupled Kelvin waves | |
Wang, Lu1,2,3; Li, Tim1,2,3 | |
2017-04-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 48 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | Mechanisms for an in-phase relationship between convection and low-level zonal wind and the slow propagation of the convectively coupled Kelvin wave (CCKW) are investigated by analyzing satellite-based brightness temperature and reanalysis data and by constructing a simple theoretical model. Observational data analysis reveals an eastward shift of the low-level convergence and moisture relative to the CCKW convective center. The composite vertical structures show that the low-level convergence lies in the planetary boundary layer (PBL) (below 800 hPa), and is induced by the pressure trough above the top of PBL through an Ekman-pumping process. A traditional view of a slower eastward propagation speed compared to the dry Kelvin waves is attributed to the reduction of atmospheric static stability in mid-troposphere due to the convective heating effect. The authors' quantitative assessment of the heating effect shows that this effect alone cannot explain the observed CCKW phase speed. We hypothesize that additional slowing process arises from the effect of zonally asymmetric PBL moisture. A simple theoretical model is constructed to understand the relative role of the heating induced effective static stability effect and the PBL moisture effect. The result demonstrates the important role of the both effects. Thus, PBL-free atmosphere interaction is important in explaining the observed structure and propagation of CCKW. |
英文关键词 | Kelvin wave Indian Ocean Planetary boundary layer Ekman pumping Theoretical model |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000398926400021 |
WOS关键词 | MADDEN-JULIAN OSCILLATION ; TROPICAL INTRASEASONAL OSCILLATION ; EQUATORIAL WAVES ; STRATIFORM INSTABILITY ; EASTWARD PROPAGATION ; CLIMATE MODELS ; PART I ; VARIABILITY ; ATMOSPHERE ; CISK |
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/36179 |
专题 | 气候变化 |
作者单位 | 1.Nanjing Univ Informat Sci & Technol, Key Lab Meteorol Disaster, Minist Educ KLME,Collaborat Innovat Ctr Forecast, Joint Int Res Lab Climate & Environm Change ILCEC, Nanjing, Jiangsu, Peoples R China; 2.Univ Hawaii, Int Pacific Res Ctr, 2525 Correa Rd, Honolulu, HI 96822 USA; 3.Univ Hawaii, Sch Ocean & Earth Sci & Technol, 2525 Correa Rd, Honolulu, HI 96822 USA |
推荐引用方式 GB/T 7714 | Wang, Lu,Li, Tim. Roles of convective heating and boundary-layer moisture asymmetry in slowing down the convectively coupled Kelvin waves[J]. CLIMATE DYNAMICS,2017,48. |
APA | Wang, Lu,&Li, Tim.(2017).Roles of convective heating and boundary-layer moisture asymmetry in slowing down the convectively coupled Kelvin waves.CLIMATE DYNAMICS,48. |
MLA | Wang, Lu,et al."Roles of convective heating and boundary-layer moisture asymmetry in slowing down the convectively coupled Kelvin waves".CLIMATE DYNAMICS 48(2017). |
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