inorganic nitrogen during snowmelt

Mixed bed ion exchange resins were incubated from autumn through snowmelt in 2011-12 and 2012-13 within the Kuparuk River Basin. Replicate resin bags were incubated at three to five positions within and adjacent to each of six water tracks. Three bags were installed at each of the replicate locations. One bag was installed in a plastic cup at the ground surface and captured only atmospheric deposition; one bag was attached to the moss surface; and one bag was installed beneath the green moss layer. Bags were collected upon thaw in spring and frozen until extraction in 2M potassium chloride. Extracts were frozen until analysis for nitrate and ammonium via automated colorimetry.