![]() ![]() ![]() Higher pressure increases the temperature of air parcels below. When the moon is overhead, its gravity causes Earth’s atmosphere to bulge toward it, so the pressure or weight of the atmosphere on that side of the planet goes up. Their new paper is the first to show that the moon’s gravitational tug also puts a slight damper on the rain. “When the moon is overhead or underfoot, the air pressure is higher,” Kohyama said. An earlier paper by the UW researchers used a global grid of data to confirm that air pressure on the surface definitely varies with the position of the moon. University of WashingtonĪir pressure changes linked to the position of the moon was first detected in 1847, and temperature in 1932, in ground-based observations. The change is 0.78 micrometers, or less than one ten thousandth of an inch, per hour. The top panel shows the air pressure, the middle shows the rate of change in air pressure, and the bottom shows the rainfall difference from the average. Satellite data over the tropics, between 10 degrees S and 10 degrees N, shows a slight dip in rainfall when the moon is directly overhead or underfoot. ![]()
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