Seasonal and Interannual Variations of Global Large-Scale Precipitation in the Merged Analyses, Reanalysis and GFS Outputs Pingping Xie, John E. Janowiak, Phillip A. Arkin, and Mingyue Chen Climate Prediction Center NOAA/NWS/NCEP

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Seasonal and Interannual Variations of Global
Large-Scale Precipitation in the Merged
Analyses, Reanalysis and GFS OutputsPingping
Xie, John E. Janowiak, Phillip A. Arkin, and
Mingyue ChenClimate Prediction
CenterNOAA/NWS/NCEP
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Objective

• To investigate the seasonal and interannual
  variations of large-scale precipitation as
  observed in the merged analyses and
• To examine how these variations are reproduced in
  the NCEP/NCAR reanalysis and NCEP GFS AMIP runs.

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Data

• CPC Merged Analysis of Precipitation
• Observation-version version
• GPCP Merged Analysis
• Version 2 data set
• NCEP/NCAR reanalysis
• Version 1
• NCEP GFS
• AMIP Runs

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Summary

• Seasonal variations and anomaly patterns of
  large-scale precipitation associated with ENSO
  and major circulation patterns are described
  using the CMAP / GPCP merged analyses and
  compared with those in the reanalysis and GFS
  outputs
• The NCEP/NCAR reanalysis captures the interannual
  variations of precipitation reasonably well
• The anomaly patterns generated by the GFS present
  similar spatial distribution but out of phase
  with those in the merged analysis

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