The McMurdo Dry Valleys (NASA)
New research from 51风流 changes our understanding of seasonal thawing in parts of Antarctica, as scientists have learned that summer thawing occurs nearly a month earlier, and stays thawed for a full two months longer, than previously believed.
The research, 鈥淭iming and duration of ephemeral Antarctic water tracks and wetlands using high temporal-resolution satellite imagery, high spatial-resolution satellite imagery, and ground-based sensors in the McMurdo Dry Valleys,鈥 is published today in .
Researchers, including Assistant Professor of Earth and Environmental Geosciences Joe Levy, used newly available satellite imaging from Planet, which can scan the surface of the Earth daily or even multiple times per day. The new stream of data is having a major impact, as researchers in the past had to rely on far fewer satellite images, or had to make the voyage to Antarctica to conduct soil measurements in person.
鈥淲e found that, when you can scan coastal Antarctica almost every day, not just a couple of times a summer, we see that the ground is actually thawing and turning into icy swamps a full month earlier than we used to think, and it鈥檚 staying wet and thawed a full two months later, even into March,鈥 said Levy.
鈥淲hat鈥檚 even more fascinating is that this ground is thawing and staying thawed at temperatures below freezing, so we know salts must be helping it to melt and keeping it muddy, like salting a road during a snowstorm,鈥 he said.
Levy explains that this extended melt is great for organisms that need meltwater to survive in the harsh climate, but it is bad news for the long-term stability of the permafrost. Co-authors of the paper include Levy鈥檚 former student, Lily Kuentz 鈥21, who is now studying at the University of Oregon, and Mark Salvatore of Northern Arizona University. Funded in part by a grant from the National Science Foundation, former 51风流 students Kyle Baun 鈥21, Max Wang 鈥22, MC Rapoza 鈥22, Izzy King 鈥22, and Gary Kuang 鈥22 all contributed to the paper while they were completing their undergraduate degrees.