DOI: 10.1007/s00382-017-3869-5
Scopus记录号: 2-s2.0-85028756006
论文题名: Convectively coupled equatorial waves within the MJO during CINDY/DYNAMO: slow Kelvin waves as building blocks
作者: Kikuchi K. ; Kiladis G.N. ; Dias J. ; Nasuno T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-11-12 起始页码: 4211
结束页码: 4230
语种: 英语
Scopus关键词: equatorial wave
; Kelvin wave
; Madden-Julian oscillation
; wave propagation
英文摘要: This study examines the relationship between the MJO and convectively coupled equatorial waves (CCEWs) during the CINDY2011/DYNAMO field campaign using satellite-borne infrared radiation data, in order to better understand the interaction between convection and the large-scale circulation. The spatio-temporal wavelet transform (STWT) enables us to document the convective signals within the MJO envelope in terms of CCEWs in great detail, through localization of space–time spectra at any given location and time. Three MJO events that occurred in October, November, and December 2011 are examined. It is, in general, difficult to find universal relationships between the MJO and CCEWs, implying that MJOs are diverse in terms of the types of disturbances that make up its convective envelope. However, it is found in all MJO events that the major convective body of the MJO is made up mainly by slow convectively coupled Kelvin waves. These Kelvin waves have relatively fast phase speeds of 10–13 m s−1 outside of, and slow phase speeds of ~8–9 m s−1 within the MJO. Sometimes even slower eastward propagating signals with 3–5 m s−1 phase speed show up within the MJO, which, as well as the slow Kelvin waves, appear to comprise major building blocks of the MJO. It is also suggested that these eastward propagating waves often occur coincident with n = 1 WIG waves, which is consistent with the schematic model from Nakazawa in 1988. Some practical aspects that facilitate use of the STWT are also elaborated upon and discussed. © 2017, Springer-Verlag GmbH Germany. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109295
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, 1680 East West Road, Post Bldg. 401, Honolulu, HI 96822, United States; Physical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, United States; Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
Recommended Citation:
Kikuchi K.,Kiladis G.N.,Dias J.,et al. Convectively coupled equatorial waves within the MJO during CINDY/DYNAMO: slow Kelvin waves as building blocks[J]. Climate Dynamics,2018-01-01,50(2018-11-12)