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Tropical Intraseasonal Variability in the MRI-20km60L AGCM

Liu, Ping ; Kajikawa, Yoshiyuki ; Wang, Bin ; Kitoh, Akio ; Yasunari, Tetsuzo ; Li, Tim ; Annamalai, H. ; Fu, Xiouhua ; Kikuchi, Kazuyoshi ; Mizuta, Ryo ; Rajendran, Kavirajan ; Waliser, Duane E. ; Kim, Daehyun

Journal of climate, 2009-04, Vol.22 (8), p.2006-2022 [Periódico revisado por pares]

Boston, MA: American Meteorological Society

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Título:
Tropical Intraseasonal Variability in the MRI-20km60L AGCM
Autor: Liu, Ping ; Kajikawa, Yoshiyuki ; Wang, Bin ; Kitoh, Akio ; Yasunari, Tetsuzo ; Li, Tim ; Annamalai, H. ; Fu, Xiouhua ; Kikuchi, Kazuyoshi ; Mizuta, Ryo ; Rajendran, Kavirajan ; Waliser, Duane E. ; Kim, Daehyun
Assuntos: Acoustic spectra ; Anomalies ; Atmospheric boundary layer ; Atmospheric circulation ; Atmospheric models ; Climate models ; Climatology. Bioclimatology. Climate change ; Cloud parameterization ; Clouds ; Convection ; Convergence ; Direction ; Disclosure ; Earth, ocean, space ; Energy spectra ; Exact sciences and technology ; External geophysics ; General circulation models ; General circulation. Atmospheric waves ; Madden-Julian oscillation ; Magnetic resonance imaging ; Meteorology ; Modeling ; Moisture effects ; Oceans ; Parameterization ; Power spectra ; Propagation ; Propagation modes ; Seasonal variations ; Seasonality ; Simulation ; Simulations ; Software packages ; Spectra ; Summer ; Variability ; Wind ; Winds
É parte de: Journal of climate, 2009-04, Vol.22 (8), p.2006-2022
Descrição: 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.
Editor: Boston, MA: American Meteorological Society
Idioma: Inglês

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Tropical Intraseasonal Variability in the MRI-20km60L AGCM

Liu, Ping ; Kajikawa, Yoshiyuki ; Wang, Bin ; Kitoh, Akio ; Yasunari, Tetsuzo ; Li, Tim ; Annamalai, H. ; Fu, Xiouhua ; Kikuchi, Kazuyoshi ; Mizuta, Ryo ; Rajendran, Kavirajan ; Waliser, Duane E. ; Kim, Daehyun

Boston, MA: American Meteorological Society

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