Met Office Hadley Centre observations datasets
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Merged (00Z+12Z) observational experiments

Seasonal merged (00Z+12Z) temperature anomalies for the period 1958 to 2003 at 14 pressure levels (1000, 850, 700, 500, 400, 300, 250, 200, 150, 100, 70, 50, 30 and 20 hPa) were input into the system during each experiment. These were derived from raw daily data that were input into the RAdiosonde OBservation COrrection using REanalyses (RAOBCORE) data set. This data set is a merge of radiosonde ingest to ERA-40 and the Integrated Global Radiosonde Archive (IGRA), with preference given to ERA-40 ingest data. An ensemble of 100 random experiments was created using the parameter settings listed here. For more information about the experiments and system settings see Guo et al. (2008) and McCarthy et al. (2008).

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