Abstract
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.
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Notes
Precipitation is assimilated only in ERA-I and MERRA.
When MERRA assimilates precipitation observation over oceans, it is weighted only very weakly so that it effectively has almost no impact.
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Acknowledgments
This work was supported by the Korea Meteorological Administration Research and Development Program under Grant APCC 2013-3141. Also, this work was supported by the NASA grant NNX09AK34G for DK, and the NASA Modeling, Analysis, and Prediction (MAP) program for SDS. DEW’s and BT’s contribution to this research was performed at Jet Propulsion Laboratory (JPL), California Institute of Technology (Caltech), under a contract with National Aeronautics and Space Administration (NASA). The authors are grateful for the computing resources provided by NASA and the Supercomputing Center at Korea Institute of Science and Technology Information (KSC-2013-C2-011).
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Kim, D., Lee, MI., Kim, D. et al. Representation of tropical subseasonal variability of precipitation in global reanalyses. Clim Dyn 43, 517–534 (2014). https://doi.org/10.1007/s00382-013-1890-x
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DOI: https://doi.org/10.1007/s00382-013-1890-x