North Temperate Lakes LTER: Light Extinction 1981 - current

A light (PAR) extinction coefficient is calculated for the water column for the eleven primary lakes (Allequash, Big Muskellunge, Crystal, Sparkling, Trout, Crystal Bog, Trout Bog, Mendota, Monona, Wingra, and Fish) and two additional lakes near Madison, Wisconsin (Waubesa and Kegonsa). Data exists only for the Trout Lake-area lakes through 2018. Beginning in 2019, the Madison-area lakes were added. The fraction of surface light is computed at 0.25-m to 1-m depth intervals depending on the lake. The light (PAR) extinction coefficient is calculated by regressing ln(fraction of light(z)) on depth z. Sampling Frequency: fortnightly during ice-free season - every 6 weeks during ice-covered season Number of sites: 13. The raw light data can be found in two other datasets: https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-ntl&identifier=29 & https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-ntl&identifier=401