Analyzing different types of sedimentation on some islands of the Pacific Ocean directly affected by global warming cloud, and others who are nearby, the researchers were able to reconstruct the pattern of rainfall with a very fine scan time, arriving less movements along the longitude dell'ITCZ.

 

 

The most significant result is certainly one that shows that this type of convection has reached its maximum south during the period of marked cooling of the Little Ice Age, a climate phase for which there is almost total agreement on the factors that forcing would have generated, or on the variation of solar as a whole, is deductible by the frequency of occurrence of sunspots. Just at that stage it was recorded the Maunder Minimum and Dalton, from the names of those who have observed and documented.

Subsequently, in conjunction with a trend of rising temperatures began more than three hundred years ago, the position dell'ITCZ would have been a shift towards the north with an average speed of movement at 1.4km per year. Areas once very wet, like the Galapagos Islands, are currently characterized by an arid climate, just because they have ceased to suffer the effects of the intense convection of the ITCZ. In parallel, areas with rainfall significantly reduced once, are now among the most rainy of the planet.

The so-called contour conditions, namely the distribution of land and several mountain ranges that have an important role in the dynamics of atmospheric circulation in the troposphere, are certainly not changed, so the origin of this shift must be sought in other factors of forcing.