Abstract
Abstract The impact of assimilating Special Sensor Microwave/Imager (SSM/I) total precipitable water (TPW) on the Canadian Meteorological Centre (CMC) operational analyses and forecasts is evaluated. Assimilation cycles were performed for the months of July 1996 and December 1996. The agreement between the SSM/I TPW climatology and the analyzed TPW for the control case (for which only conventional observations were assimilated) was quite good (root-mean-square difference of 2.8 kg m−2), which showed that the humidity analysis for the control case was already good. As a result of assimilating SSM/I TPW and depending on the month studied, collocations with radiosondes over the oceans showed that both the analyses and the 6-h forecasts of humidity were improved in the Tropics and to a lesser degree in the Southern Hemisphere extratropics. The geopotential anomaly correlations that were computed only for the July 1996 case showed an increase of 1%–2% starting with the day 3 forecast in the Tropics and the day...
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