DOI: 10.1007/s00382-011-1171-5
Scopus记录号: 2-s2.0-84861800955
论文题名: El-Nino Southern Oscillation simulated and predicted in SNU coupled GCMs
作者: Ham Y.-G. ; Kang I.-S. ; Kim D. ; Kug J.-S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 38, 期: 2017-11-12 起始页码: 2227
结束页码: 2242
语种: 英语
英文摘要: The characteristics of the El-Nino Southern Oscillation (ENSO) simulated in free integrations using two versions of the Seoul National University (SNU) ocean-atmosphere coupled global climate model (CGCM) are examined. A revised version of the SNU CGCM is developed by incorporating a reduced air-sea coupling interval (from 1 day to 2 h), a parameterization for cumulus momentum transport, a minimum entrainment rate threshold for convective plumes, and a shortened auto-conversion time scale of cloud water to raindrops. With the revised physical processes, lower tropospheric zonal wind anomalies associated with the ENSO-related sea surface temperature anomalies (SSTA) are represented with more realism than those in the original version. From too weak, the standard deviation of SST over the eastern Pacific becomes too strong in the revised version due to the enhanced air-sea coupling strength and intraseasonal variability associated with ENSO. From the oceanic side, the stronger stratification and the shallower-than-observed thermocline over the eastern Pacific also contribute to the excessive ENSO. The impacts of the revised physical processes on the seasonal predictability are investigated in two sets of the hindcast experiment performed using the two versions of CGCMs. The prediction skill measured by anomaly correlation coefficients of monthly-mean SSTA shows that the new version has a higher skill over the tropical Pacific regions compared to the old version. The better atmospheric responses to the ENSO-related SSTA in the revised version lead to the basin-wide SSTA maintained and developed in a manner that is closer to observations. The symptom of an excessively strong ENSO of the new version in the free integration is not prominent in the hindcast experiment because the thermocline depth over the eastern Pacific is maintained as initialized over the arc of time of the hindcast (7 months). © 2011 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55288
Appears in Collections: 过去全球变化的重建
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作者单位: Global Modeling and Assimilation Office, NASA Goddard Space Flight Center (NASA/GSFC), Greenbelt, Goddard Earth Sciences Technology and Research Studies and Investigations, Universities Space Research Association, Building 33, G109, Greenbelt, MD, United States; School of Earth and Environment Sciences, Seoul National University, Seoul, South Korea; Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, NY, United States; Korea Ocean Research and Development Institute, Ansan, South Korea
Recommended Citation:
Ham Y.-G.,Kang I.-S.,Kim D.,et al. El-Nino Southern Oscillation simulated and predicted in SNU coupled GCMs[J]. Climate Dynamics,2012-01-01,38(2017-11-12)