globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-011-1159-1
Scopus记录号: 2-s2.0-84860351869
论文题名:
Bimodal representation of the tropical intraseasonal oscillation
作者: Kikuchi K.; Wang B.; Kajikawa Y.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 38, 期:2017-09-10
起始页码: 1989
结束页码: 2000
语种: 英语
英文关键词: Index ; MJO ; Tropical intraseasonal oscillation
英文摘要: The tropical intraseasonal oscillation (ISO) shows distinct variability centers and propagation patterns between boreal winter and summer. To accurately represent the state of the ISO at any particular time of a year, a bimodal ISO index was developed. It consists of Madden-Julian Oscillation (MJO) mode with predominant eastward propagation along the equator and Boreal Summer ISO (BSISO) mode with prominent northward propagation and large variability in off-equatorial monsoon trough regions. The spatial-temporal patterns of the MJO and BSISO modes are identified with the extended empirical orthogonal function analysis of 31 years (1979-2009) OLR data for the December-February and June-August period, respectively. The dominant mode of the ISO at any given time can be judged by the proportions of the OLR anomalies projected onto the two modes. The bimodal ISO index provides objective and quantitative measures on the annual and interannual variations of the predominant ISO modes. It is shown that from December to April the MJO mode dominates while from June to October the BSISO mode dominates. May and November are transitional months when the predominant mode changes from one to the other. It is also shown that the fractional variance reconstructed based on the bimodal index is significantly higher than the counterpart reconstructed based on the Wheeler and Hendon's index. The bimodal ISO index provides a reliable real time monitoring skill, too. The method and results provide critical information in assessing models' performance to reproduce the ISO and developing further research on predictability of the ISO and are also useful for a variety of scientific and practical purposes. © 2011 Springer-Verlag.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55313
Appears in Collections:过去全球变化的重建

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作者单位: International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii, 1680 East West Road, POST Bldg. 401, Manoa Honolulu, HI 96822, United States; Department of Meteorology and International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii, Manoa Honolulu, HI 96822, United States; Hydrospheric Atmospheric Research Center, Nagoya University, Nagoya, Japan

Recommended Citation:
Kikuchi K.,Wang B.,Kajikawa Y.. Bimodal representation of the tropical intraseasonal oscillation[J]. Climate Dynamics,2012-01-01,38(2017-09-10)
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