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1. North Temperate Lakes LTER: Physical Limnology of Primary Study Lakes 1981 - current

   https://doi.org/10.6073/pasta/be287e7772951024ec98d73fa94eec08  

   Magnuson, John J.; Carpenter, Stephen R.; Stanley, Emily H. (January 2023, Environmental Data Initiative)

   Parameters characterizing the physical limnology of the eleven primary lakes (Allequash, Big Muskellunge, Crystal, Sparkling, Trout, bog lakes 27-02 [Crystal Bog] and 12-15 [Trout Bog], Mendota, Monona, Wingra and Fish) are measured at one station in the deepest part of each lake at 0.25-m to 1-m depth intervals depending on the lake. Measured parameters in the data set include water temperature, vertical penetration of photosynthetically active radiation (PAR), dissolved oxygen, as well as the derived parameter percent oxygen saturation. Sampling Frequency: fortnightly during ice-free season - every 6 weeks during ice-covered season for the northern lakes. The southern lakes are similar except that sampling occurs monthly during the fall and typically only once during the winter (depending on ice conditions). Number of sites: 11 Please consult NTL's website for information on experimental lake manipulations and the DNR's website for management activities 

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2. North Temperate Lakes LTER: Light Extinction 1981 - current

   https://doi.org/10.6073/pasta/9b27a778ac7b8c894ecded9d21c07da5  

   Magnuson, John J; Carpenter, Stephen R; Stanley, Emily H (January 2023, Environmental Data Initiative)

   A light (PAR) extinction coefficient is calculated for the water column for the eleven primary lakes (Allequash, Big Muskellunge, Crystal, Sparkling, and Trout lakes, unnamed lakes 27-02 [Crystal Bog] and 12-15 [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 

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3. North Temperate Lakes LTER: Lake Levels 1981 - current

   https://doi.org/10.6073/pasta/3130ec118795a9fe5481fc9e980cdaea  

   Magnuson, John J; Carpenter, Stephen R; Stanley, Emily H (January 2023, Environmental Data Initiative)

   Lake level is measured during the open water season for the seven primary lakes in the Trout Lake area (Allequash, Big Muskellunge, Crystal, Sparkling, and Trout lakes and unnamed lakes 27-02 [Crystal Bog], and 12-15 [Trout Bog]) using Solinst level loggers in stilling wells logging at 30 minute intervals. Lake level elevation is also manually measured several times each season using a survey of benchmarks of known elevation to calibrate the level loggers. Prior to 2017, lake level was measured with staff gauges placed near the shoreline. Staff gauges were read every two weeks as part of LTER routine sampling. Values presented in the database are the water elevation in meters above sea level. Sampling Frequency: before 2017, every two weeks. 2017 to present, every 30 minutes. Number of sites: 7. 

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4. North Temperate Lakes LTER: Snow and Ice Depth 1982 - current

   https://doi.org/10.6073/pasta/038d117f5244b520f7f87ef41dba7a31  

   Magnuson, John J; Carpenter, Stephen R; Stanley, Emily H (January 2023, Environmental Data Initiative)

   Snow and ice depth are measured during the winter months on the eleven primary lakes (Allequash, Big Muskellunge, Crystal, Sparkling, Trout lakes, unnamed lakes 27-02 [Crystal Bog] and 12-15 [Trout Bog], Fish, Mendota, Monona and Wingra). 10 snow depth measurements are taken in a circle around the sampling location and averaged to single measurement. Sampling Frequency: every 6 weeks during ice-covered season in the north and typically once during the winter in the south. Number of sites: 11. 

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5. North Temperate Lakes LTER: Chemical Limnology of Primary Study Lakes: Nutrients, pH and Carbon 1981 - current

   https://doi.org/10.6073/pasta/96ef570fe4d45e0bc8e6edc39b87b955  

   Lead PI, NTL; Magnuson, John; Carpenter, Stephen; Stanley, Emily (January 2020, Environmental Data Initiative)

   Parameters characterizing the nutrient chemistry of the eleven primary lakes (Allequash, Big Muskellunge, Crystal, Sparkling, and Trout lakes, unnamed lakes 27-02 [Crystal Bog] and 12-15 [Trout Bog], Mendota, Monona, Wingra, and Fish) are measured at one station in the deepest part of each lake at the top and bottom of the epilimnion, mid-thermocline, and top, middle, and bottom of the hypolimnion. These parameters include total nitrogen, total dissolved nitrogen (only in the northern lakes), nitrate, ammonia, total phosphorus, total dissolved phosphorus (only in the northern lakes), dissolved reactive phosphorus (only in the southern lakes and not in Wingra and Fish after 2003), bicarbonite-reactive filtered and unfiltered silica (both discontinued in 2003), dissolved reactive silica, field pH, air equilibrated pH, total alkalinity, total inorganic carbon, dissolved inorganic carbon, total organic carbon, dissolved organic carbon, and total particulate matter (only in the northern lakes in this data set. Total particulate matter in southern lakes starting in 2000 is available in a separate dataset). Sampling Frequency: monthly during ice-free season - every 6 weeks during ice-covered season for the northern lakes. The southern lakes are similar except that sampling occurs monthly during the fall and typically only once during the winter (depending on ice conditions). Number of sites: 11 

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