Rockfalls are a common occurrence in Yosemite National Park, and they can be a hazard to visitors and park staff. A new study by scientists at the University of California, Berkeley, has found that the frequency of rockfalls in Yosemite is closely linked to the temperature of the surrounding rocks.

The study, published in the journal Nature Geoscience, analyzed data on rockfalls that occurred in Yosemite between 2008 and 2017. The researchers found that the number of rockfalls increased significantly during periods of high temperatures, particularly during heat waves.

"Our findings suggest that climate change, which is leading to warmer temperatures in Yosemite, is likely to increase the frequency of rockfalls in the park," said study lead author Jeffrey Moore. "This could pose a significant safety hazard to visitors and park staff, and it could also damage infrastructure such as roads and trails."

The researchers found that the relationship between temperature and rockfalls was strongest in areas where the rocks were fractured or weathered. These areas are more susceptible to rockfalls because the heat can cause the rocks to expand and crack, making them more likely to break away from the cliff face.

The study also found that the frequency of rockfalls varied depending on the type of rock. Rocks such as granite and gneiss, which are common in Yosemite, are more susceptible to rockfalls than other types of rocks such as sandstone and limestone.

The researchers say that their findings could help park managers to develop strategies to reduce the risk of rockfalls in Yosemite. For example, park managers could close areas that are particularly susceptible to rockfalls during periods of high temperatures. They could also install rockfall mitigation devices such as fences and nets to help prevent rocks from falling onto roads and trails.

"Our study provides new insights into the relationship between climate change and rockfalls," said Moore. "This information can be used to help protect visitors and park staff, and it can also help park managers to develop strategies to adapt to the effects of climate change."

In addition to the risk of rockfalls, climate change is also expected to cause other problems in Yosemite National Park, such as:

* Increased flooding and mudslides

* More frequent and severe wildfires

* Changes in plant and animal life

* Decreased snowpack and glacial ice

These changes could all have a significant impact on the park's ecosystem and its ability to attract visitors.