sabato 22 novembre 2014

written by Emanuela Piccoli

In the past years episodes of heavy rainfalls occured in some areas of Italy. Everyone is aware of their effects: flooding and landslides. Such events always have brought great discomfort and tragedy among citizens. The purpose of this article is to discuss the connection between global overheating and heavy rainfalls.
Convection currents are at basis of every rainfall: hot water evaporates from the sea to the atmosphere and then, when it is too cold, it condenses and falls as rain. Such a process is subject to changes due to different chemical and physical conditions, like sea temperature. In fact, warmer seas lead to greater amounts of water evaporating and, thus, to heavier precipitations.
The number of intense precipitation events has been slowly increasing during the past 50 years in the U.S. Researchers coming from the University of Miami found out that heat-trapping gases, like carbon dioxide (CO2), may contribute to heavier rainfall and, therefore, scientists reject the idea of rainfall due to natural variations in climate.
However logic the conclusion of scientists might seem, their analysis focuses on too ashort period of time. Further pieces of research are needed to strengthen their thesis.

Fonte: http://www.climatecentral.org/news/human-connection-to-precipitation-extremes-studies-say
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