Arctic LTER - Precipitation Chemistry

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Unfrozen precipitation has been collected at Toolik Lake LTER site since 1989. There are two types of collections: "wet only" using an Aerochem Metrics model 301 wet/dry precipitation collector and "bulk precipitation" using open funnel precipitation collectors. Wet only precipitation was collected every ten days from 1989 - 1992 and every 7 days from 1993 to present. Bulk precipitation was collected after every rain event. For all precipitation, volume, pH, NH4-N, NO3-N, and PO4-P were measured at the field station. For wet only precipitation a subsample of 250ml was sent for standardized EPA rain water analysis.

• 1989_presentgsbkrn - Bulk precipitation was collected during summer months (June, July and August) on a per rain event basis at the University of Alaska Fairbanks Toolik Field Station, North Slope of Alaska (68 degrees 37' 42"N, 149 degrees 35' 46"W). Analysis of pH, NH4-N and phosphorus were performed at the field station. NO3-N were frozen and analyzed in Woods Hole, MA

• 1989_presentgswfrn - 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.

• 2003gs_snowpit - Inorganic Nitrogen and phosphorus were analyzed on snow samples taken from two snow pits near the long-term acrtic LTER mesic acidic tussock experimental plots. The snow layers in each pit were described and sampled separtely with the help of Matthrew Sturm.