The phases of the moon affect the amount of precipitation. Free Technical Library News

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The phases of the moon affect rainfall

08.02.2016

The phases of the moon affect the amount of precipitation - however, very little. This discovery was made by atmospheric scientists from the University of Washington (USA), led by doctoral student Tsubasa Kohyama and Professor John Wallace.

The phases of the Moon arise because it revolves around the Earth - with a period of 27,3 days - and is illuminated to varying degrees by the Sun at different points in its orbit. We are interested, however, not in illumination, but in the very fact that on different days a natural satellite of our planet is above different parts of its surface. The moon, with its attraction, slightly pulls the Earth's atmosphere in its direction, making the atmospheric column higher, as, accordingly, atmospheric pressure. Such a relationship between the phases of the moon and atmospheric pressure was first noticed back in 1847.

The increased pressure raises the temperature of the air. The warmer the air, the more moisture it can hold. As a result, there is less rainfall.

Kohiyama and Wallace and colleagues first tested these theoretical findings experimentally by analyzing data collected over 15 years (1998-2012) by the Tropical Rainfall Measurement Mission, a science satellite jointly launched by NASA and the Japan Aerospace Agency. It turned out that when the moon is at its zenith, the rain really becomes a little weaker - although only by 1%, which is not noticeable to the average person, but, nevertheless, is a statistically significant difference.

This discovery will help in testing climate models for their accuracy. If the climate model is accurate enough, it should take into account the weakening of rain in areas over which the Moon passes.

Scientists from the University of Washington intend to continue their research and find out, in particular, whether the phases of the moon have a stronger effect on heavy rains, up to an increase in their frequency.

Note that the Moon affects many processes occurring on Earth. Perhaps the most famous effect is the tides that occur when the Moon is at perihelion - i.e. when it is closest to the planet, because the moon's orbit has the shape of an ellipse. Last September, the full moon and perigee were separated by only one hour, so it was possible to see the surface of our planet's natural satellite as detailed as possible, with simple binoculars or even with the naked eye.

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