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

针对11座主要湖泊（包括Allequash湖、Big Muskellunge湖、Crystal湖、Sparkling湖、Trout湖，以及27-02号沼泽湖[Crystal Bog湖]、12-15号沼泽湖[Trout Bog湖]、Mendota湖、Monona湖、Wingra湖与Fish湖）的主要离子特征参数，于各湖泊最深点位的采样站位开展测定：采样层位涵盖表水层（epilimnion）的顶部与底部、温跃层中部，以及底水层（hypolimnion）的顶部、中部与底部。本次测定的参数包含氯离子、硫酸根离子、钙离子、镁离子、钠离子、钾离子、铁离子、锰离子，以及比电导率（仅针对北部湖泊）。采样频率为每季度一次，覆盖冬季、春季与秋季的水体混合期，以及夏季的水体分层期。总采样站位数量为11个。