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

表征11个主要湖泊（阿勒夸什湖（Allequash）、大马斯凯尔伦吉湖（Big Muskellunge）、水晶湖（Crystal）、斯帕克林湖（Sparkling）、特劳特湖（Trout）、沼泽湖27-02［水晶沼泽（Crystal Bog）］、沼泽湖12-15［鳟鱼沼泽（Trout Bog）］、门多塔湖（Mendota）、莫诺纳湖（Monona）、温格拉湖（Wingra）以及菲什湖（Fish））主要离子特征的参数，于每个湖泊最深区域的一个站位进行采样测定，采样层位涵盖表水层（epilimnion）的顶部与底部、温跃层（thermocline）中部，以及下层冷水层（hypolimnion）的顶部、中部和底部。本次测定包含的参数有氯化物、硫酸盐、钙、镁、钠、钾、铁、锰，以及比电导率（specific conductance，仅针对北部湖泊测定该指标）。采样频率为季度采样，覆盖冬季、春季、秋季混合期与夏季分层期。总采样位点数量为11个。