This study examines two key parameters of the hydrological cycle, water vapor (WV) and precipitation rates (PR), as modelled by the chemistry transport model MATCH (Model of Atmospheric Transport and Chemistry) driven by National Centers for Environmental Prediction (NCEP) reanalysis data (NRA). For model output evaluation we 5 25 too rapid conversion of WV to precipitate in MATCH, especially in instances of strong convection, leads to regionally too dry model results and in turn to generally

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... o low WV residence times. The study additionally demonstrates the value of the GOME WV 7918 ACPD 4, 7917-7984, 2004 Abstract Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Print Version Interactive Discussion EGU record for model evaluation. 25 and a following companion paper will therefore address the question how well the hydrological cycle is represented by a CTM frequently used for modelling of tropospheric 7919 ACPD 4, 2004