i satelliti indicano che i modelli previsionali sbagliano

[samurai]

sovrastimando le precipitazioni, che dovrebbero essere superiori, in base al riscaldamento , mentre cosi' non e' secondo le osservazioni da satellite , per chi mastica un po'di inglese posto l'articolo di "NATURE"

News

Published online: 31 May 2007; | doi:10.1038/news070528-9 Warmer world gets wetter Satellite observations suggest climate models are wrong on rainfall.Harvey Leifert Global warming should mean more rain — but how much is unclear. Getty Global warming will increase worldwide precipitation by three times the amount predicted by current climate models, according to a study based on two decades' worth of satellite observations. The discrepancy between the models and the data might mean that the models are wrong. Or it might be that two decades is not long enough to test their predictions. But researchers believe that the work is a step towards understanding the thorny issue of how global temperatures affect rainfall. Warmer air holds more water. Satellite observations and climate models agree that each rise of 1 °C in global temperatures increases the amount of water vapour in the atmosphere by about 6.5%. But climate models project that global warming will also bring weaker winds, leading to less water evaporating from the ocean and counteracting the effect of warming. Models predict that worldwide precipitation — which must match the amount of evaporation — will increase by only 1-3% for each degree of future global warming.