Aerial photo of Kinwamakwad Lake (Long Lake) in 2015 during a whole-lake manipulation in which dissolved organic carbon was increased by ~50% in the treatment basin (right of the white curtain in center of photo). The difference in water color between the two basins can be seen with a pair of unofficial world's largest secchi disks. The photo was taken by Jason Kurtzweil of University of Wisconsin - Madison.
Jason Kurtzweil
Jason Kurtzweil took the photo for use by <a href="//commons.wikimedia.org/wiki/User:Jayzlimno" title="User:Jayzlimno">Jayzlimno</a> and others on the whole-lake manipulation project.