4 Radiosonde Datasets 1958-2005 RATPAC (large-scale zonal time series, homogeneity adjusted) HadAT (gridded, homogeneity adjusted) Randel and Wu (RATPAC-based, with further homogeneity adjustments) FUB – gridded analyses, 0-90N, no adjustments, available only for 1964-2001
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