DOI: 10.1007/s00382-016-3219-z
Scopus记录号: 2-s2.0-84974824418
论文题名: Tropical intraseasonal oscillation simulated in an AMIP-type experiment by NICAM
作者: Kikuchi K. ; Kodama C. ; Nasuno T. ; Nakano M. ; Miura H. ; Satoh M. ; Noda A.T. ; Yamada Y.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期: 2017-07-08 起始页码: 2507
结束页码: 2528
语种: 英语
英文关键词: AMIP
; BSISO
; ISO
; MJO
; NICAM
英文摘要: It is the first time for the non-hydrostatic icosahedral atmospheric model (NICAM), at a horizontal mesh size of approximately 14-km, to conduct a continuous long-term Atmospheric Model Intercomparison Project-type simulation. This study examines the performance of NICAM in simulating the tropical intraseasonal oscillation (ISO) from a statistical point of view using 30-year data (1979–2008) in the context of the bimodal ISO representation concept proposed by Kikuchi et al., which allows us to examine the seasonally varying behavior of the ISO in great detail, in addition to the MJO working group level 2 diagnostics. It is found that many of the fundamental features of the ISO are well captured by NICAM. The evolution of the ISO convection as well as large-scale circulation over the course of its life cycle is reasonably well reproduced throughout the year. As in the observation, the Madden–Julian oscillation (MJO) mode, characterized by prominent eastward propagation of convection, is predominant during boreal winter, whereas the boreal summer ISO (BSISO) mode, by a combination of pronounced eastward and northward propagation, during summer. The overall shape of the seasonal cycle as measured by the numbers of significant MJO and BSISO days in a month is relatively well captured. Two major biases, however, are also identified. The amplitude of the simulated ISO is weaker by a factor of ~2. Significant BSISO events sometimes appear even during winter (December–April), amounting to ~30 % of the total significant ISO days as opposed to ~2 % in the observation. The results here warrant further studies using the simulation dataset to understand not only many aspects of the dynamics and physics of the ISO but also its role in weather and climate. It is also demonstrated that the concept of the bimodal ISO representation provides a useful framework for assessing model’s capability to simulate, and illuminating model’s deficiencies in reproducing, the ISO. The nature and causes of the two major biases are also discussed. © 2016, Springer-Verlag Berlin Heidelberg. 资助项目: NSF, National Science Foundation
; RIKEN
; RIKEN
; RIKEN
; NOAA, National Oceanic and Atmospheric Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53296
Appears in Collections: 过去全球变化的重建
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作者单位: International Pacific Research Center, University of Hawai‘i, 1680 East West Road, POST Bldg. 401, Honolulu, HI, United States; Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan; University of Tokyo, Tokyo, Japan; Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan
Recommended Citation:
Kikuchi K.,Kodama C.,Nasuno T.,et al. Tropical intraseasonal oscillation simulated in an AMIP-type experiment by NICAM[J]. Climate Dynamics,2017-01-01,48(2017-07-08)