Editorial Type:
Article
Article Type:
Research Article

Tropical Intraseasonal Variability in the MRI-20km60L AGCM

Ping Liu International Pacific Research Center, SOEST, University of Hawaii at Manoa, Honolulu, Hawaii

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Yoshiyuki Kajikawa International Pacific Research Center, SOEST, University of Hawaii at Manoa, Honolulu, Hawaii

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Bin Wang International Pacific Research Center, SOEST, University of Hawaii at Manoa, Honolulu, Hawaii

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Akio Kitoh Meteorological Research Institute, Tsukuba, Japan

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Tetsuzo Yasunari Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan

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Tim Li International Pacific Research Center, SOEST, University of Hawaii at Manoa, Honolulu, Hawaii

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H. Annamalai International Pacific Research Center, SOEST, University of Hawaii at Manoa, Honolulu, Hawaii

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Xiouhua Fu International Pacific Research Center, SOEST, University of Hawaii at Manoa, Honolulu, Hawaii

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Kazuyoshi Kikuchi International Pacific Research Center, SOEST, University of Hawaii at Manoa, Honolulu, Hawaii

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Ryo Mizuta Advanced Earth Science and Technology Organization, Meteorological Research Institute, Tsukuba, Japan

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Kavirajan Rajendran Centre for Mathematical Modelling and Computer Simulation, National Aerospace Laboratories, Bangalore, India

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Duane E. Waliser Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California

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Daehyun Kim School of Earth and Environmental Science, Seoul National University, Seoul, South Korea

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Print Publication:
15 Apr 2009
DOI:
https://doi.org/10.1175/2008JCLI2406.1
Page(s):
2006–2022
Restricted access

Abstract

This study documents the detailed characteristics of the tropical intraseasonal variability (TISV) in the MRI-20km60L AGCM that uses a variant of the Arakawa–Schubert cumulus parameterization. Mean states, power spectra, propagation features, leading EOF modes, horizontal and vertical structures, and seasonality associated with the TISV are analyzed. Results show that the model reproduces the mean states in winds realistically and in convection comparable to that of the observations. However, the simulated TISV is less realistic. It shows low amplitudes in convection and low-level winds in the 30–60-day band. Filtered anomalies have standing structures. Power spectra and lag correlation of the signals do not propagate dominantly either in the eastward direction during boreal winter or in the northward direction during boreal summer. A combined EOF (CEOF) analysis shows that winds and convection have a loose coupling that cannot sustain the simulated TISV as realistically as that observed. In the composited mature phase of the simulated MJO, the low-level convergence does not lead convection clearly so that the moisture anomalies do not tilt westward in the vertical, indicating that the low-level convergence does not favor the eastward propagation. The less realistic TISV suggests that the representation of cumulus convection needs to be improved in this model.

Corresponding author address: Ping Liu, 1680 East-West Road, International Pacific Research Center, University of Hawaii at Manoa, Honolulu, HI 96822. Email: pliu@hawaii.edu

Abstract

This study documents the detailed characteristics of the tropical intraseasonal variability (TISV) in the MRI-20km60L AGCM that uses a variant of the Arakawa–Schubert cumulus parameterization. Mean states, power spectra, propagation features, leading EOF modes, horizontal and vertical structures, and seasonality associated with the TISV are analyzed. Results show that the model reproduces the mean states in winds realistically and in convection comparable to that of the observations. However, the simulated TISV is less realistic. It shows low amplitudes in convection and low-level winds in the 30–60-day band. Filtered anomalies have standing structures. Power spectra and lag correlation of the signals do not propagate dominantly either in the eastward direction during boreal winter or in the northward direction during boreal summer. A combined EOF (CEOF) analysis shows that winds and convection have a loose coupling that cannot sustain the simulated TISV as realistically as that observed. In the composited mature phase of the simulated MJO, the low-level convergence does not lead convection clearly so that the moisture anomalies do not tilt westward in the vertical, indicating that the low-level convergence does not favor the eastward propagation. The less realistic TISV suggests that the representation of cumulus convection needs to be improved in this model.

Corresponding author address: Ping Liu, 1680 East-West Road, International Pacific Research Center, University of Hawaii at Manoa, Honolulu, HI 96822. Email: pliu@hawaii.edu

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