For researchers seeking to understand the effects of climate change on the weather of the North American Southwest, the answer lies in traveling millions of years back in time on wings of wax—leaf wax.
Bhattacharya began using them while working as a postdoctoral fellow in Tierney’s lab. Five years ago, she and Ran Feng, a coauthor, came up with the idea of studying the Pliocene while riding a bus during a conference for young researchers.Joides Resolution
“The hydrogen that’s used to make the wax is coming from rainwater that the plant uses to grow. You can think of isotopes as like a fingerprint,” Tierney says. “These isotopes actually trace the kind of rainfall you have, which is pretty cool. They can also trace the amount of winter rainfall versus summer rainfall. So, it’s pretty powerful.
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