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Conditions of Use

The re-use of scientific data has the potential to greatly increase communication, collaboration and synthesis within and among disciplines, and thus is fostered, supported and encouraged. Permission to use this dataset is granted to the Data User free of charge subject to the following terms:

1) Acceptable use. Use of the dataset will be restricted to academic, research, educational, government, recreational, or other not-for-profit professional purposes. The Data User is permitted to produce and distribute derived works from this dataset provided that they are released under the same license terms as those accompanying this Data Set. Any other uses for the Data Set or its derived products will require explicit permission from the dataset owner.
2 ) Redistribution. The data are provided for use by the Data User. The metadata and this license must accompany all copies made and be available to all users of this Data Set. The Data User will not redistribute the original Data Set beyond this collaboration sphere.
3 ) Citation. It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User will properly cite the Data Set in any publications or in the metadata of any derived data products that were produced using the Data Set. Citation should take the following general form: Creator, Year of Data Publication, Title of Dataset, Publisher, Dataset identifier. For example:

Shaver, G. 1989. Above ground biomass in acidic tussock tundra experimental site, 1989, Arctic LTER, Toolik, Alaska. Arctic LTER, Marine Biological Lab, Woods Hole, Ma 02543. 1989gsttbm 

4 ) Acknowledgement. The Data User should acknowledge any institutional support or specific funding awards referenced in the metadata accompanying this dataset in any publications where the Data Set contributed significantly to its content. Acknowledgements should identify the supporting party, the party that received the support, and any identifying information such as grant numbers. For example:

Data sets were provided by the Arctic LTER. This material is based upon work supported by the National Science Foundation under Grants #DEB-981022, 9211775, 8702328; #OPP-9911278, 9911681, 9732281, 9615411, 9615563, 9615942, 9615949, 9400722, 9415411, 9318529; #BSR 9019055, 8806635, 8507493.

5 ) Notification. The Data User will notify the Data Set Contact when any derivative work or publication based on or derived from the Data Set is distributed. The Data User will provide the data contact with two reprints of any publications resulting from use of the Data Set and will provide copies, or on-line access to, any derived digital products. Notification will include an explanation of how the Data Set was used to produce the derived work.
6 ) Collaboration. The Data Set has been released in the spirit of open scientific collaboration. Data Users are thus strongly encouraged to consider consultation, collaboration and/or co-authorship with the Data Set Creator.

By accepting this Data Set, the Data User agrees to abide by the terms of this agreement. The Data Owner shall have the right to terminate this agreement immediately by written notice upon the Data User's breach of, or non-compliance with, any of its terms. The Data User may be held responsible for any misuse that is caused or encouraged by the Data User's failure to abide by the terms of this agreement.


While substantial efforts are made to ensure the accuracy of data and documentation contained in this Data Set, complete accuracy of data and metadata cannot be guaranteed. All data and metadata are made available "as is". The Data User holds all parties involved in the production or distribution of the Data Set harmless for damages resulting from its use or interpretation.

Dataset URLs:METADATA: HTML, Rich Text, XML(EML compliant)
DATA: Comma Delimited, Excel file with Metadata and data, Dataset via LTER Data Portal
Dataset ID:1989-2012_OksrukuyikNO3.03
Dataset Title:NO3 on Oksrukuyik Creek near Toolik Field Station, Alaska 1989-2012
Investigator 1: 
First Name:Breck
Last Name:Bowden
Organization:University of Vermont
Address line 2:303D Aiken Center
Address line 3:Rubenstein School of Environment and Natural Resources
Zip Code:05405
Investigator 2: 
First Name:Bruce
Last Name:Peterson
Organization:Marine Biological Laboratory
Address line 2:7 MBL St.
Address line 3:The Ecosystems Center
City:Woods Hole
Zip Code:02543
Investigator 3: 
First Name:Linda
Last Name:Deegan
Organization:Marine Biological Laboratory
Address line 2:7 MBL St.
Address line 3:The Ecosystems Center
City:Woods Hole
Zip Code:02543
Investigator 4: 
First Name:Alex
Last Name:Huryn
Organization:University of Alabama
Address line 2:
Address line 3:
Zip Code:
Investigator 5: 
First Name:Elissa
Last Name:Schuett
Organization:University of Vermont
Associate Investigators:
Keywords:nitrate, inorganic nutrients, Oksrukuyik Creek, arctic streams, streams
Abstract:Samples from designated stations from the Oksrukuyik were collected during each summer from 1989 to current time. Phosphorus addition has occurred from 1991 to 1996; station sites are relative distance from the original 1991 dripper. Phosphoric acid was added to the stream to increase soluble reactive phosphorus by 0.32 uM. From 1993 to 1996, Ammonium Sulfate was added along with the Phosphoric Acid. This addition of Ammonium Sulfate was added to the stream to increase N by 7.1 uM. From 1997 to present, the historic fertilized reach has been in recovery. Samples were analyzed for Nitrate since 1989 on the Oksrukuyik Creek.
For questions about the Metadata and data contact the Investigators.
For information about this web site contact:
Arctic LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7496
Online URL:
Data File URL
Data File Name 1989-2012_OksrukuyikNO3.csv
Beginning Date 6/26/1989
End Date 8/6/2012
Number of Data Records 827
Other Files to Reference
Availability Status 1
Quality Control Information field replicates and lab replicates of samples as well as quality assurance of data
Maintenance Description ongoing data collection, updated annually
Log of Changes: 4/2011: JPB organized metadata and data into this file.
Version 2: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 15Jan14; JPB updated 2011 and 2012 data into this file.
Version 3: Changed Distrubution URL since the LTER network DAS system is being discontinued. JimL 9Apr2015
Location Name Oksrukuyik -0.1k Oksrukuyik -0.3k Oksrukuyik -0.7k Oksrukuyik 1.37k Wolf Creek  
Geographic Description Oksrukuyik Creek, North Slope of Alaska, reference reach, upstream of the formerly fertilized reach. Oksrukuyik Creek, North Slope of Alaska, reference reach, upstream of the formerly fertilized reach. Oksrukuyik Creek, North Slope of Alaska, reference reach, upstream of the formerly fertilized reach. Oksrukuyik Creek, North Slope of Alaska, recovery reach, formerly fertilized reach. Tributary of Oksrukuyik Creek, North Slope of Alaska.  
Location Bounding Box            
West Bounding Coordinate            
East Bounding Coordinate            
North Bounding Coordinate            
South Bounding Coordinate            
OR if single point location            
Latitude 68.671486222 68.671371694 68.67101801 68.679780992 68.6696714078003  
Longitude -149.1281271 -149.131155484 -149.137892686 -149.114206438 -149.127044677734  
Elevation 761.756 763.881 764.537 762.678 762  
Link to Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map  
Organisms studied
Methods:Water samples were collected at designated stations along the Oskrukuyik Creek.
Water was filtered through a 25mm GF/F filter in the field; samples were analyzed upon return to Toolik Field Station for soluble reactive phosphate and ammonium, using manual chemistry methods listed in the LTER database protocols. Samples were frozen and run using the QuikChem METHOD 31-1-7-04-1-E on a Lachat at Rubenstein Ecosystem Science Labortory in Burlington, VT.
See current protocols at
Timeline of sample analysis
1983-96 --- Nutrients were analyzed using a Technicon autoanalyzer II at Toolik - cadmium reduction for nitrate)
1997-2010 -- Beginning in 1997 nitrate/nitrite samples were frozen, shipped to the MBL and analyzed using cadmium reduction on a Lachat autoanalyzer. Lachat QuikChem METHOD 31-1-7-04-1-C
2011- Present -- Beginning in 2011 nitrate/nitrite samples were frozen, shipped to the Rubenstein Ecosystem Science Labortory (RESL) and analyzed using cadmium reduction on a Lachat autoanalyzer; analysis at the RESL continues to present. Lachat QuikChem METHOD 31-1-7-04-1-E.
2007 --- Dataset updated 3 April 2008 - EBS
2008 --- Dataset updated 10 March 2009 - EBS
2009 --- Dataset updated 13 October 2009 - EBS
2010 --- Dataset updated 8 January 2010 with 2000-2002 data - EBS
2010 --- Dataset updated 29 November 2010 with 2010 data - EBS
2010 --- Dataset updated with 1983-2000 data - EBS
2013 --- Dataset updated with 2011-2013 data - JPB

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
Site Code LTER site code text        
River Site of Measurement (named) text        
Date Date datetime   dd-mmm-yy    
Station (km) Distance from original N and P dripper, in kilometers. Negative numbers indicate sites upstream from fertilization, postive numbers are downstream. text        
Reach Reference, recovery, or fertilized reach based on the location of the phosphorus and nitrogen addition. Additions occurred 1991-1996. text        
uM_NO3 Nitrate concentration number micromolePerLiter     -1111=no data | -9999=below detection limit

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