DOI: 10.1175/JCLI-D-17-0246.1
Scopus记录号: 2-s2.0-85047102534
论文题名: Roles of shallow convective moistening in the eastward propagation of the MJO in MIROC6
作者: Hirota N. ; Ogura T. ; Tatebe H. ; Shiogama H. ; Kimoto M. ; Watanabe M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 8 起始页码: 3033
结束页码: 3047
语种: 英语
英文关键词: Climate models
; Convective parameterization
; Madden-Julian oscillation
Scopus关键词: Boundary layers
; Climate models
; Moisture
; Troposphere
; Wind effects
; Convective activity
; Convective envelope
; Convective parameterization
; Eastward propagation
; Interdisciplinary research
; Madden-Julian oscillation
; Parameter perturbation
; Shallow convection
; Climatology
; atmospheric convection
; atmospheric moisture
; climate modeling
; convective system
; Madden-Julian oscillation
; parameterization
; research
; troposphere
; Indian Ocean
; Pacific Ocean
; Pacific Ocean (West)
英文摘要: This study examines the roles of shallow convection in the eastward propagation of the Madden-Julian oscillation (MJO) using new and old versions of the Model for Interdisciplinary Research on Climate, versions 6 and 5 (MIROC6 and MIROC5), respectively. A major modification of MIROC6 from its previous version, MIROC5, is the implementation of the shallow convection scheme following Park and Bretherton. The MJO representation in MIROC6 is improved compared to MIROC5. The MJO convective envelopes that occur over the Indian Ocean, which decay too early over the western Pacific in MIROC5, propagate farther into the eastern Pacific in MIROC6. In the initial stage of the MJO development, the shallow convection transports boundary layer moisture upward forming an important moisture source for the lower free troposphere in MIROC6. In the mature stage of the MJO, the deep convection becomes increasingly active with the large amount of moisture in the free troposphere. Accordingly, the moisture anomalies associated with the MJO show an upward- and westward-tilted structure, as in the observations. Conversely, MIROC5 exhibits a dry bias in the lower free troposphere, suggesting that the shallow convective activity is underestimated. A parameter perturbation experiment, modifying the intensity of shallow convection, confirms that enhanced shallow convection reduces the moisture bias in the lower free troposphere and improves the simulation of the MJO in MIROC6. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111577
Appears in Collections: 气候减缓与适应
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作者单位: National Institute for Environmental Studies, Tsukuba, Japan; Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan; Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan
Recommended Citation:
Hirota N.,Ogura T.,Tatebe H.,et al. Roles of shallow convective moistening in the eastward propagation of the MJO in MIROC6[J]. Journal of Climate,2018-01-01,31(8)