The United States National Park Service has an internal division called the "Natural Sounds and Night Skies" group [0] which provides scientific research on the

The United States National Park Service has an internal division called the "Natural Sounds and Night Skies" group [0] which provides scientific research on the anthropogenic impacts on the sound and light-scapes in US National Parks. They have a particular focus on sounds made by aircraft. One of the ways they do this is by positioning microphones in fairly hilariously remote places and leaving them there for a while. I have a friend who was an intern with them in Alaska, and got to ride in helicopters to service microphones mounted on glaciers. They have many thousands of hours of audio recordings. They've published scientific articles quite extensively on this topic [1]. [0]: https://www.nps.gov/orgs/1050/index.htm https://www.nps.gov/orgs/1050/index.htm [1]: https://scholar.google.com/citations?user=lzWYCLwAAAAJ&hl=en&authuser=1 https://scholar.google.com/citations?user=lzWYCLwAAAAJ&hl=en...