North Temperate Lakes LTER: Chemical Limnology of Primary Study Lakes: Major Ions 1981 - current

Parameters characterizing the major ions 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 the top and bottom of the epilimnion, mid-thermocline, and top, middle, and bottom of the hypolimnion. These parameters include chloride, sulfate, calcium, magnesium, sodium, potassium, iron, manganese, and specific conductance (northern lakes only). Sampling Frequency: quarterly (winter, spring and fall mixis, and summer stratified periods) Number of sites: 11 Please consult NTL's website for information on experimental lake manipulations and the DNR's website for management activities

测定了11个主要湖泊（Allequash、Big Muskellunge、Crystal、Sparkling、Trout、27-02号沼泽湖（Crystal Bog）、12-15号沼泽湖（Trout Bog）、Mendota、Monona、Wingra及Fish湖）主要离子的特征参数，采样点位于每个湖泊最深处的一个站点，覆盖表水层（epilimnion）顶部与底部、温跃层（thermocline）中部、湖下层（hypolimnion）顶部、中部与底部。这些参数包括氯化物（chloride）、硫酸盐（sulfate）、钙（calcium）、镁（magnesium）、钠（sodium）、钾（potassium）、铁（iron）、锰（manganese）及电导率（specific conductance，仅限北部湖泊）。采样频率：每季度一次（冬季、春秋混合期及夏季分层期）。站点数量：11个。有关湖泊实验调控的信息，请查阅NTL官网；有关管理活动的信息，请查阅DNR官网。