Representation of tropical subseasonal variability of precipitation in global reanalyses

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• 作者：Daehyun Kim (1)
  Myong-In Lee (2)
  Dongmin Kim (2)
  Siegfried D. Schubert (3)
  Duane E. Waliser (4)
  Baijun Tian (4)
  
• 关键词：Reanalysis ; Precipitation ; Tropics ; Subseasonal variability ; Madden ; Julian oscillation ; Convectively ; coupled equatorial waves
• 刊名：Climate Dynamics
• 出版年：2014
• 出版时间：July 2014
• 年：2014
• 卷：43
• 期：1-2
• 页码：517-534
• 全文大小：2,725 KB
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• 作者单位：Daehyun Kim (1)
  Myong-In Lee (2)
  Dongmin Kim (2)
  Siegfried D. Schubert (3)
  Duane E. Waliser (4)
  Baijun Tian (4)
  
  1. Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA
  2. School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, UNIST-gil 50, Ulsan, 689-798, Republic of Korea
  3. NASA Goddard Space Flight Center, Greenbelt, MD, USA
  4. NASA Jet Propulsion Laboratory, Pasadena, CA, USA
  
• ISSN：1432-0894

文摘

Tropical subseasonal variability of precipitation from five global reanalyses (RAs) is evaluated against Global Precipitation Climatology Project (GPCP) and Tropical Rainfall Measuring Mission (TRMM) observations. The RAs include the three generations of global RAs from the National Center for Environmental Prediction (NCEP), and two other RAs from the European Centre for Medium-Range Weather Forecasts (ECMWF) and the National Aeronautics and Space Administration/Goddard Space Flight Center (NASA/GSFC). The analysis includes comparisons of the seasonal means and subseasonal variances of precipitation, and probability densities of rain intensity in selected areas. In addition, the space–time power spectrum was computed to examine the tropical Madden-Julian Oscillation (MJO) and convectively coupled equatorial waves (CCEWs). The modern RAs show significant improvement in their representation of the mean state and subseasonal variability of precipitation when compared to the two older NCEP RAs: patterns of the seasonal mean state and the amplitude of subseasonal variability are more realistic in the modern RAs. However, the probability density of rain intensity in the modern RAs show discrepancies from observations that are similar to what the old RAs have. The modern RAs show higher coherence of CCEWs with observed variability and more realistic eastward propagation of the MJO precipitation. The modern RAs, however, exhibit common systematic deficiencies including: (1) variability of the CCEWs that tends to be either too weak or too strong, (2) limited coherence with observations for waves other than the MJO, and (3) a systematic phase lead or lag for the higher-frequency waves.