GFDL - Geophysical Fluid Dynamics Laboratory

Reanalysis Ideas — Recent Work

Some Ideas For Future Reanalysis Efforts

John Lanzante

Some Progress

  • In our earlierst work, LKS (Lanzante, Klein, Seidel, 2003; Part 1, Part 2)
    have devised and applied a scheme to make homogeneity adjustments for
    long time series of radiosonde temperature. Comparisons with independent
    satellite MSU data suggest an improvement via adjustment. An example, at
    Pechora, Russia, shows that after adjustment the radiosonde series are much more
    similar to MSU temperatures.

  • LKS find a systematic bias in that unadjusted data have spurious cooling trends
    in both the troposphere and stratosphere.

  • Diagnostic work (Lanzante 2007; Lanzante and Free 2008) with GFDL and
    CMIP3 GCM climate change experiments suggests data adjustment may influence
    detection/attribution of global change — adjustment typically leads to better
    agreement with GCMs.

  • Subsequent work by ourselves and others has led to the development of 5 distinct
    homogenized radiosonde temperature datasets (RATPAC; HadAT2; IUK;
    RAOBCORE; RICH). Unfortunately it is not possible to demonstate which of
    these products is the “best”, since currently there is no “gold standard” against
    which to evalutate them. Therefore, most analysts seeking trend estimates
    will use all 5 datasets and compare results for consistency. It would obviously be
    desireable to have one “best” climate quality product.

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