Warmer temperatures help air to hold more moisture, which can create wetter storms.
Climate change is making hurricanes like Ian and other storms rainier, and scientists are now starting to quantify just how much. A study published this week in the journalfinds that in recent decades it when it rains in the US, the precipitation falls more fiercely than in decades past. The intensity of rainfall has shifted from lighter periods of rain to more moderate and heavy deluges.
. “For this particular study, we wanted to look at the non-extreme events, which are, by definition, much more common. What we found is pretty simple: When it rains now, it rains more.”predicted this increase in rain intensity, especially during weather events like Hurricane Ian. But this new study examined precipitation data across all levels of strength, from quick showers to a big floods.
, “but the intensities are becoming more variable as well, making water resource management even more challenging.”Intensity of both rain and snow had particularly increased in the East, South, and Midwest, but changes in the western United States were not detected. The western US is currently in theWhile this study does not directly point to climate change as the driver of the the changes, the findings are consistent with human-caused global warming and climate model predictions.
“Warmer air holds more moisture,” Harp explained. “For every one degree Celsius the atmosphere warms, it holds 7 percent more water vapor. So these observations are consistent with the predicted effects of human-caused global warming.”
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