globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-013-1985-4
Scopus记录号: 2-s2.0-84906943493
论文题名:
The self-organizing map, a new approach to apprehend the Madden-Julian Oscillation influence on the intraseasonal variability of rainfall in the southern African region
作者: Oettli P.; Tozuka T.; Izumo T.; Engelbrecht F.A.; Yamagata T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 43, 期:2017-05-06
起始页码: 1557
结束页码: 1573
语种: 英语
英文关键词: Intraseasonal variability ; Madden-Julian Oscillation ; Self-organizing map ; Southern African rainfall ; Subtropical atmosphere response
英文摘要: The Madden-Julian Oscillation (MJO) is the major mode of intraseasonal variability (30-60 days) in the tropics, having large rainfall impacts globally, and possibly on southern Africa. However, the latter impact is not well understood and needs to be further explored. The life cycle of the MJO, known to be asymmetric, has been nevertheless analyzed usually through methods constrained by both linearity and orthogonality, such as empirical orthogonal function analysis. Here we explore a non-linear classification method, the self-organizing map (SOM), a type of artificial neural network used to produce a low-dimensional representation of high-dimensional datasets, to capture more accurately the life cycle of the MJO and its global impacts. The classification is applied on intraseasonal anomalies of outgoing longwave radiation within the tropical region over the 1980-2009 period. Using the SOM to describe the MJO is a new approach, complimentary to the usual real-time multivariate MJO index. It efficiently captures this propagative phenomenon and its seasonality, and is shown to provide additional temporal and spatial information on MJO activity. For each node, the subtropical convection is analyzed, with a particular focus on the southern Africa region. Results show that the convection activity over the central tropical Indian Ocean is a key factor influencing the intraseasonal convective activity over the southern African region. Enhanced (suppressed) convection over the central Indian Ocean tends to suppress (enhance) convection over the southern African region with a 10-day lag by modulating the moisture transport. © 2013 Springer-Verlag Berlin Heidelberg.
资助项目: JST, Japan Science and Technology Agency
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54431
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作者单位: Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo, Japan; IRD, LOCEAN, Paris, France; CSIR Natural Resources and the Environment, Climate Studies, Modelling and Environmental Health, Pretoria, South Africa; Application Laboratory, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan

Recommended Citation:
Oettli P.,Tozuka T.,Izumo T.,et al. The self-organizing map, a new approach to apprehend the Madden-Julian Oscillation influence on the intraseasonal variability of rainfall in the southern African region[J]. Climate Dynamics,2014-01-01,43(2017-05-06)
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