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

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; not measured on lakes Mendota, Monona, Wingra, and Fish), 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本数据集针对11处主要湖泊（Allequash湖、Big Muskellunge湖、Crystal湖、Sparkling湖、Trout湖、27-02号泥炭湖[Crystal Bog]与12-15号泥炭湖[Trout Bog]、Mendota湖、Monona湖、Wingra湖以及Fish湖）的物理湖沼学（physical limnology）特征开展测量：在每个湖泊最深区域设置1个采样站，采样深度间隔依湖泊不同为0.25米至1米。数据集包含的实测参数包括水温、光合有效辐射（photosynthetically active radiation, PAR）的垂直穿透深度（注：Mendota、Monona、Wingra及Fish湖未开展该参数测量）、溶解氧，以及衍生参数氧饱和度百分比。采样频率：无冰期为每两周采样一次；北部湖泊的冰封期采样频率为每6周一次。南部湖泊采样规则基本一致，但秋季为每月采样一次，冬季通常仅采样一次（视冰层实际条件而定）。采样点位总数：11个。如需查询湖泊实验调控相关信息，请访问NTL官网；有关管理活动的详情，请查阅DNR官网。