DOI: 10.1007/s00382-014-2268-4
Scopus记录号: 2-s2.0-84939882018
论文题名: Thermodynamic characteristics and responses to ENSO of dominant intraseasonal modes in the East Asian summer monsoon
作者: Oh H. ; Ha K.-J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 44, 期: 2017-07-08 起始页码: 1751
结束页码: 1766
语种: 英语
英文关键词: Changma
; East Asian summer monsoon
; ENSO
; Intraseasonal mode
; Meiyu–Baiu
; SOM
; Western north Pacific subtropical high
英文摘要: The moisture supply and El Niño Southern Oscillation (ENSO) characteristics are investigated for different intraseasonal modes of the East Asian summer monsoon (EASM) identified as the Meiyu–Baiu, Changma, post-Changma, and dry-spell modes. The investigation is conducted with a type of artificial neural network known as self-organizing map analysis. The major modes tend to be dominated by the moisture convergence of the moisture budget equation along the rain-band. The Meiyu–Baiu mode is strongly linked to both the anomalous low-level convergence and vertical wind shear, which is related to baroclinic instability with warm air rising and cold air sinking. The Changma mode has a strengthened tropic–subtropics connection along the western north Pacific subtropical high, which induces vertical destabilization and strong convective instability by the low-level warm advection of moisture-laden air and upper-level cold advection of dry air. In late summer, the post-Changma and dry-spell modes are characterized by anomalous southeasterly flow of warm and moist air from western north Pacific monsoon, and low-level easterly flow, respectively. In response to the preceding El Niño, the Meiyu–Baiu and Changma modes occur more frequently, while the post-Changma and dry-spell modes show the opposite. The response to the La Niña exhibits a relatively weak connection, indicating asymmetric response on the preceding ENSO. This prominent difference in response to the ENSO leads to different behaviors of the Indian Ocean and western Pacific thermal state, and consequently, the distinct moisture supply and instability variations for the EASM intraseasonal modes. © 2014, The Author(s). 资助项目: NRF, National Research Foundation of Korea
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54223
Appears in Collections: 过去全球变化的重建
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作者单位: Division of Earth Environmental System, Pusan National University, Busan, South Korea
Recommended Citation:
Oh H.,Ha K.-J.. Thermodynamic characteristics and responses to ENSO of dominant intraseasonal modes in the East Asian summer monsoon[J]. Climate Dynamics,2015-01-01,44(2017-07-08)