GSTDTAP  > 气候变化
DOI10.1007/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
ISSN0930-7575
EISSN1432-0894
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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