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Atmospheric Moisture Content Affected by Global Warming
When you heat the planet, you increase the ability of the atmosphere to hold moisture. The atmospheres water vapour content has increased by about 0.41 kilograms per cubic meter (kg/mē) per decade since 1988, and natural variability in climate just cant explain this moisture change, said lead author of the study, Benjamin Santer from the Lawrence Livermore National Laboratory, US.
The most plausible explanation is that its due to the human-caused increase in greenhouse gases, Santer added.
The study in the Sept. 17 online edition of the Proceedings of the National Academy of Sciences, says that more water vapour which is itself a greenhouse gas amplifies the warming effect of increased atmospheric levels of carbon dioxide.
Santer said this is a positive feedback.
Santer said the water vapour feedback mechanism worked in the following way: As the atmosphere warmed due to human-caused increases in carbon dioxide, methane, nitrous oxide, and chlorofluorocarbons, water vapour increased, trapping more heat in the atmosphere, which in turn caused a further increase in water vapour.
He said basic theory, observations and climate model results, all showed that the increase in water vapour was roughly six percent to 7.5 percent per degree Celsius warming of the lower atmosphere.
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