Precipitation, collected from a wet/dry precipitation collector located near University of Alaska Fairbanks Toolik Field Station, North Slope of Alaska (68 degrees 37' 42"N, 149 degrees 35' 46"W) was sent out for standardized EPA rain water analysis. Nutrient chemistry was also run on a sub sample at the field station.
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An Aerochem Metrics model 301 wet/dry precipitation collector was setup near the Arctic LTER Toolik Experimental Moist Acidic Tussock Plots during the summer months. Precipitation was collected every ten days from 1989 - 1992 and every 7 days from 1993 to present. Dryfall was collected at the end of the August fro 1989 to 1997. Presently dryfall is not collected. If any bird droppings were noted then the sample was discarded. The precipitation volume, pH, NH4-N, NO3-N, and PO4-P were measured at the field station. In 1989 NH4-N and PO4-P chemistry was done manually using standard nutrient procedures (see ARC LTER Methods Manual) with NO3-N being analyzed back in Woods Hole, MA. From 1990-1996 the nutrients were analyze using a Technicon Autoanlyzer or an Alpkem FLOW Solution Analyzer at the station. From 1997 to present analysis of pH, NH4-N and phosphorus are performed at the field station with NO3-N samples being frozen and sent back to Woods Hole, MA for analysis. A sub sample of 250ml was sent for standardized EPA rain water analysis to Global Geochemistry. Global; 6919 Eton Ave.; Canoga Park, CA 91303 until 1997 and then 1998 to present to Shepard Analytical,4545 E. Industrial St., Unit 5P;Simi Valley, CA 93063; Phone: (805) 526-7026; FAX: (805) 526-7032.
Notes: Samples sent from Alaska (not frozen) approx. every 7-10 days; Anion/Cation ratio- acceptable range 0.85-1.15. Values less than detection are negative. Numbers after minus sign are 3x the linear least squares error of fit term for the curve used to calculate data. Missing samples are designated by a #N/A.
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TLK NH4-N mg/m2
TLK NO3-N mg/m2
TLK PO4-P mg/m2