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Drier Springs Bring Hotter Summers in Withering Southwest

Like other climate scientists, he knew from research papers and worldwide storm patterns that a warming atmosphere is thirstier and sops up more moisture from oceans and the land. “But, in the Southwest, we ve seen the exact opposite happening,” said Williams, an associate professor in the University of California, Los Angeles’ geography department. “For the last 50 or so years, we ve actually seen the amount of water vapor molecules in the atmosphere decline” while temperatures have climbed about twice as fast as the global average. A new paper from UCLA researcher Karen McKinnon largely solved that puzzle by showing the hottest days in the summer months are getting dramatically drier as a result of the Southwestern spring heating up and leaving less moisture behind to cool the summer through evaporation.

How can smoke alter the weather and climate?

Wildfire smoke can warm or cool the air temperature and even reduce rainfall. Author: Cory Reppenhagen Updated: 10:57 PM MDT July 13, 2021 BOULDER, Colo. Wildfire smoke can cool or warm the air temperature. It depends on the type of particles and which level they are located in the atmosphere. It also depends a lot on the color of the smoke particles.  “Dark particles will absorb the light and actually heat up the air around them, said Christine Wiedinmyer an atmospheric scientist at CU Boulder and the Cooperative Institute for Research in Environmental Sciences (CIRES). Whereas the lighter particles will actually scatter the light and diffuse the light. So they have competing effects.”

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