No stranger to hot weather, the Southern California region is facing more humid heat waves that test the adaptability of its residents. But different areas feel different effects.
Journal of Applied Meteorology and Climatology"We can't just look at air temperature when we talk about heat wave impacts," said study author Anamika Shreevastava, a NASA postdoctoral program fellow at JPL."People tend to get acclimatized to where they live. We have to understand how anomalous conditions are making a difference in what people are used to."
Greater Los Angeles is a prime example of an urban heat island—cities and suburbs woven with heat-trapping concrete and asphalt that lead tothan nearby rural areas that have more vegetation. Bordered by mountains and the ocean, the Greater L.A. area encompasses suburbs and skyscrapers, with a dense population and disparities in green space. It includes several counties, tens of thousands of square miles, and more than 18 million people, making it a compelling test bed for heat wave research.
For their study, the scientists used NASA's Modern-Era Retrospective Analysis for Research and Applications, version 2 data set—a reanalysis of historical atmospheric observations. They found that both heat waves drove temperatures above the 90th percentile for the August-September climate record in L.A. Using advanced weather modeling, they simulated the heat waves and looked at their impacts across the region.
to human health was more intense than the September event. That's because the wet-bulb temperature—which relates heat to how well our bodies cool down by sweating—surged due to the humidity.
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