Vertical structure and physical processes of the Madden-Julian oscillation: Exploring key model physics in climate simulations

Aimed at reducing deficiencies in representing the Madden‐Julian oscillation (MJO) in general circulation models (GCMs), a global model evaluation project on vertical structure and physical processes of the MJO was coordinated. In this paper, results from the climate simulation component of this pro...

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Vydané v:Journal of geophysical research. Atmospheres Ročník 120; číslo 10; s. 4718 - 4748
Hlavní autori: Jiang, Xianan, Waliser, Duane E., Xavier, Prince K., Petch, Jon, Klingaman, Nicholas P., Woolnough, Steven J., Guan, Bin, Bellon, Gilles, Crueger, Traute, DeMott, Charlotte, Hannay, Cecile, Lin, Hai, Hu, Wenting, Kim, Daehyun, Lappen, Cara-Lyn, Lu, Mong-Ming, Ma, Hsi-Yen, Miyakawa, Tomoki, Ridout, James A., Schubert, Siegfried D., Scinocca, John, Seo, Kyong-Hwan, Shindo, Eiki, Song, Xiaoliang, Stan, Cristiana, Tseng, Wan-Ling, Wang, Wanqiu, Wu, Tongwen, Wu, Xiaoqing, Wyser, Klaus, Zhang, Guang J., Zhu, Hongyan
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Washington Blackwell Publishing Ltd 27.05.2015
American Geophysical Union
Predmet:
Climate
Computer simulation
Convection
ENVIRONMENTAL SCIENCES
Feedback
general circulation model
General circulation models
Geophysics
GEOSCIENCES
Inclusions
Madden-Julian Oscillation
Marine
moist convection
multiscale interaction
Physics
Relative humidity
Simulation
Stability
Troposphere
I, Indo-Pacific
ISSN:2169-897X, 2169-8996
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Popis
Shrnutí:Aimed at reducing deficiencies in representing the Madden‐Julian oscillation (MJO) in general circulation models (GCMs), a global model evaluation project on vertical structure and physical processes of the MJO was coordinated. In this paper, results from the climate simulation component of this project are reported. It is shown that the MJO remains a great challenge in these latest generation GCMs. The systematic eastward propagation of the MJO is only well simulated in about one fourth of the total participating models. The observed vertical westward tilt with altitude of the MJO is well simulated in good MJO models but not in the poor ones. Damped Kelvin wave responses to the east of convection in the lower troposphere could be responsible for the missing MJO preconditioning process in these poor MJO models. Several process‐oriented diagnostics were conducted to discriminate key processes for realistic MJO simulations. While large‐scale rainfall partition and low‐level mean zonal winds over the Indo‐Pacific in a model are not found to be closely associated with its MJO skill, two metrics, including the low‐level relative humidity difference between high‐ and low‐rain events and seasonal mean gross moist stability, exhibit statistically significant correlations with the MJO performance. It is further indicated that increased cloud‐radiative feedback tends to be associated with reduced amplitude of intraseasonal variability, which is incompatible with the radiative instability theory previously proposed for the MJO. Results in this study confirm that inclusion of air‐sea interaction can lead to significant improvement in simulating the MJO. Key Points Realistic vertical structure is closely related to good MJO simulations Environment moisture and convection‐circulation feedback are critical for MJO Air‐sea interaction can significantly improve MJO simulations in many GCMs
Bibliografia:NASA - No. NNX13AM18G
istex:A9902AD8E1EB961C3F9B14C85E0A7D685A23F50D
Jet Propulsion Laboratory, California Institute of Technology
ArticleID:JGRD52131
Office of Naval Research
Office of Naval Research - No. AGS-1221013
National Centre for Atmospheric Science - No. R8/H12/83/001
NOAA - No. NA12OAR4310075
ark:/67375/WNG-7ZBT2MV0-P
National Research Foundation of Korea - No. 2011-0015486
European Union, Seventh Framework Programme (FP7/2007-2013) - No. 244067
RGCM and ASR
National Science Foundation (NSF) - No. AGS-1228302; No. AGS-1211848; No. ATM-0935263
Korea Meteorological Administration Research and Development Program - No. CATER 2013-3142
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
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AC52-07NA27344
USDOE
LLNL-JRNL-741128
ISSN:2169-897X
2169-8996
DOI:10.1002/2014JD022375