| DOI: | 10.1175/JCLI-D-14-00744.1
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| Scopus记录号: | 2-s2.0-84942927016
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| 论文题名: | Some climatological aspects of the Madden-Julian oscillation (MJO) |
| 作者: | Lafleur D.M.; Barrett B.S.; Henderson G.R.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2015
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| 卷: | 28, 期:15 | | 起始页码: | 6039
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| 结束页码: | 6053
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| 语种: | 英语
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| Scopus关键词: | Climate change
; Wind effects
; Activity levels
; Atmospheric response
; Climate variability
; Convective activity
; Intraseasonal variability
; Low-frequency
; Madden-Julian oscillation
; Seasonal variability
; Climatology
; amplitude
; climatology
; convective system
; Madden-Julian oscillation
; seasonal variation
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| 英文摘要: | One of the most commonly used metrics for both locating the Madden-Julian oscillation (MJO) geographically and defining the intensity of MJO convective activity is the real-time multivariate MJO (RMM) index. However, a climatology of the MJO, particularly with respect to the frequency of activity levels or of consecutive days at certain activity thresholds, does not yet exist. Thus, several climatological aspects of the MJO were developed in this study: 1) annual and 2) seasonal variability in MJO intensity, quantified using four defined activity categories (inactive, active, very active, and extremely active); 3) persistence in the above-defined four categories; 4) cycle length; and 5) low-frequency (decadal) variability. On an annual basis, MJO phases 1 and 2 occurred more often, and phase 8 occurred less often, than the other phases throughout the year. Notable seasonality was also found, particularly in the frequency of extremely active MJO in March-May (8% of days) compared with June-August (only 1% of days). The MJO was persistent in time and across intensity categories, and all activity categories the following day had at least an 80% chance of maintaining their amplitudes. Implications of this climatology are discussed, including length of complete MJO cycles (the shortest of which was 17 days) and correlations between MJO amplitude and atmospheric response. © 2015 American Meteorological Society. |
| 资助项目: | NSF, Norsk Sykepleierforbund
; NSF, Norsk Sykepleierforbund
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/50521
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Oceanography Department, U.S. Naval Academy, Annapolis, MD, United States
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| Recommended Citation: | |
Lafleur D.M.,Barrett B.S.,Henderson G.R.. Some climatological aspects of the Madden-Julian oscillation (MJO)[J]. Journal of Climate,2015-01-01,28(15)
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