Active Chlorophyll A, and primary productivity of Lake N2 reference in 1985 , Arctic LTER 1985.

Water samples were taken weekly from lake N2 reference. The sampling depths were 0, 1, 3, 5, 8, and 12 meters.  Samples were filtered through a Gelman A/E glass fiber filter. Filters were extracted in the dark for 24 hours and read on a Turner 111 fluorometer with a primary filter of 670 rattan, secondary of 64 rattan red a blue T3 bulb is used.  Algae was incubated for 24 hours, filtered onto a .45 um Metricel filter and counted with a liquid scintillation counter.

Reference Citations: R.G. Wetzel & G.E. Likens. 1979.  Limnological Methods. Saunders. Philadelphia.