---TITLE: Synthesis and Scaling of Hydrologic and Biogeochemical Data on the North Slope and Coastal Zone of Alaska ---INVESTIGATORS: - Marc Stieglitz, James McClelland, R. Max Holmes, and Bruce Peterson - Questions about this dataset should be direct to James McClelland e-mail, jimm@mail.utexas.edu telephone, 361-749-6756 University of at Austin Marine Science Institute 750 Channel View Drive Port Aransas, TX 78373 ---FUNDING SOURCE AND GRANT NUMBER: NSF-OPP-ARCSS-0436118 ---DATA SET OVERVIEW: Water chemistry data were collected between May and August from sites on the Kuparuk, Sagavanirktok, and Colville rivers during 2006 and 2007. The Kuparuk was sampled near Toolik Field Station (Lat/Lon 68.643, -149.404) and Deadhorse (Lat/Lon 70.329, -148.949). The Sagavanirktok was also sampled near Deahorse (Lat/Lon 70.249, -148.303). The Colville was sampled on the Nechelik channel near Nuiqsut (70.225, -150.994). The sampling program was designed to capture seasonal dynamics in river chemistry linked to hydrographic variations and support better estimates of nutrient, organic matter, and major ion export to the Alaskan Beaufort Sea. ---DATA COLLECTION: Field data (water temperature, pH, conductivity) were collected with a YSI 600XL sonde. pH was calibrated before each sampling. Water samples were collected multipule times per day during the spring freshet at all sites and during several storm event over the summer at the upper Kuparuk site. Samples were collected daily to weekly during all other times. Water was collected from the sub-surface using an extendable pole sampler equipped with a 1 liter polycarbonate bottle. Water from the sampler was used to fill three 1 liter transport bottles (also polycarbonate). Transport bottles were kept on ice in the dark and processed back in the lab within two hours of sampling. The sampler and transport bottles were rinsed three times with river water before each collection. In the laboratory, water was filtered through pre-combusted Whatman GF/F disks (0.7 nominal pore size). Filters were saved for analysis of particulate concentrations and stable C and N isotope ratios (separate filters for C and N). Filtrate was saved for dissolved constituent analysis. Individual filters were frozen in small plastic petri dishes and then dried in batches at 60 celcius. Filtrate for dissolved organic matter analysis was frozen in 60 ml polycarbonate bottles. Filtrate for all other analyses except alkalinity was frozen in 60 ml HDPE bottles. All storage bottles were rinsed three times with filtered sample before filling. Alkalinity was determined by titration (Gran function) immediately after filtration. During 2006, ammonium and soluble reactive phosphorus (SRP) were measured at the Toolik Field Station laboratory. Ammonium was determined following the Holmes et al. (1999) fluorescence method. SRP was measured on a UV/Vis Spectrophotometer using standard wet chemistry as described in Strickland and Parsons (1972). Nitrate and total dissolved nitrogen were measured on a Lachat autoanalyzer at the Woods Hole Research Center. All other major ion concentrations were measured on a Dionex ion chromatography system at the Woods Hole Research Center. Dissolved organic carbon concentrations were measured on a Shimadzu TOC-V CSH analyzer at the University of Texas Marine Science institute. Particulate nitrogen and carbon concentrations and stable isotope ratios were measured on a Finnigan MAT Delta Plus continuous flow mass spectrometer coupled to a Carlo Erba 1500 element analyzer at the University of Texas Marine Science Institute. H20-18O measurements were done at the Ecosystem Center Stable Isotope Laboratory (Marine Biologial Laboratory, Woods Hole, MA). During 2007, all analyses were as described for 2006 except that ammonium and total dissolved phosphorus were measured at the Woods Hole Research Center. ---DATA FORMAT: Data are provided in a Microrsoft Excel spreadsheet. The following data are included: Date/Time (UTC, YYYYMMDDHHmmss), Local Date (M/DD/YY), Local Time (h:m AM/PM), Lat (deg), Lon (Deg), pH, Temp (C), alkalinity (Alk, mg/L as CaC03), total suspended solids (TSS, mg/L), fluoride (Fl, mg/L), chloride (Cl, mg/L), sulfate (SO4, mg S/L), sodium, (Na, mg/L), potassium (K mg/L), Magnesium (Mg, mg/L), calcium (Ca mg/L), ammonium (NH4, micromoles N/L), nitrate (NO3, micromoles N/L), soluble reactive phosphorus (SRP, micromoles P/L), silicate (micromoles Si/ L), total dissolved nitrogen (TDN, micromoles N/L), total dissolved phosphorus (TDP, micromoles P/L), particulate organic nitrogen (PON, micromoles N/L), particulate organic nitrogen (PON, d15N), Water (H20, d18O), particulate organic carbon (POC, micromoles C/L), particulate organic carbon (POC, d13C), dissolved organic carbon (DOC, micromoles C/L) ---REFERENCES: Holmes, R. M., A. Aminot, R. Kerouel, B. A. Hooker, and B. J. Peterson. 1999. A simple and precise method for measuring ammonium in marine and freshwater ecosystems. Can. J. Fish. Aquat. Sci. 56:1801-1808. Strickland, J. D. H., and T. R. Parsons. 1972. A practical handbook of seawater analysis. Bulletin 167, Fisheries Research Board of Canada, Department of Fisheries and the Environment, Fisheries and Marine Service, Scientific Information and Publications Branch, Ottowa, Canada, 310 pp.