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
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Four open funnel precipitation collectors (diameter 18.6 cm) were setup near the Arctic LTER Toolik Experimental Moist Acidic Tussock Plots during the summer months. Glass wool was used to prevent debris from entering the 1 liter nalgene collection bottles. Precipitation was collected after every rain event. If any bird droppings were noted then that sample was discarded. An event rainfall is considered over when it does not rain for approximately 6 hours, however this definition is not exact.
The precipitation volume, pH, NH4-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. Where no data from all the funnels occurred it was estimated from similar rain events.
Notes: In this file only the average of each precipitation event is reported. The values were first converted to mg/m2 using the volume of rain collected in each funnel and the funnel area.
Missing samples are designated by a #N/A.
Version 2: May 2006 Converted metadata to Excel worksheet and added title and attribue. JimL
Version 3: Added LTERNET Data Access server proxy for Excel and comma delimited data files.
Version 4: Upadte LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
Version 5: Updated metadata form to newer version (without site sheet). Updated units to current standards. Fixed discrepency with header variable names. CH 25Jan2013 Updated to newer metadata with site sheet. CH March 2013.
Version 6: Updated dates in metadata and title to reflect data that is here.
Version 7: Changed Distrubution URL since the LTER network DAS system is being discontinued. JimL 9Apr2015