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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_Kuparuk_Cations.04
Dataset Title:Cations for the Kuparuk River near Toolik Field Station, Alaska for select years from 1989-2000 and 2011 to present.
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
Investigator 6: 
First Name:Adrian
Last Name:Green
Address line 2:
Address line 3:
Zip Code:
Investigator 7: 
First Name:Karie
Last Name:Slavik
Associate Investigators:
Keywords:cations, ions, Kuparuk River, streams, arctic streams, inorganic nutrients
Abstract:Samples were collected and analyzed for the cations potassium, sodium, calcium, and magnesium. Phosphorus addition has occurred since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Cation samples were analyzed for the following summers on the Kuparuk River: 1989, 1990, 1993, 1994, 2000, 2011 & 2012.
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_Kuparuk_Cations.csv
Beginning Date 6/10/1989
End Date 8/11/2012
Number of Data Records 63
Other Files to Reference
Availability Status 1
Quality Control Information
Maintenance Description
Log of Changes: 3/2013: EBS organized metadata and data into this file.
4/2013: JPB moved to new spreadsheet and updated Research Locations.
Version 2: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 15Jan14
Version 3: 12/2013: JPB added 2011+2012 data into sheet.
Version 4: Changed Distrubution URL since the LTER network DAS system is being discontinued. JimL 9Apr2015
Location Name Kuparuk 0.56k Kuparuk 2.0k  
Geographic Description Kuparuk River, North Slope of Alaska, re-fertilized reach, formerly the recovery reach after historic fertilization. Kuparuk River, North Slope of Alaska, fertilized reach.  
Location Bounding Box      
West Bounding Coordinate      
East Bounding Coordinate      
North Bounding Coordinate      
South Bounding Coordinate      
OR if single point location      
Latitude 68.64205425 68.6495472222222  
Longitude -149.403500566667 -149.416152463889  
Elevation 746.268 737.074  
Link to Google Map View on Google Map View on Google Map  
Organisms studied
Methods:Water samples were collected at designated stations along the Kuparuk River. In 1983, phosphorus addition through dripping began at the site designated as 0.0k. Stations downstream of 0.0k have positive numbers and upstream have negative numbers. The reach upstream of the phosphorus addition has remained the reference reach for the duration of this dataset. Downstream of the original phosphorus addition was the fertilized reach. In 1985, the phosphorus dripper moved to 0.59k, creating a recovery reach from 0.0k to 0.59k. In 1996, the dripper was moved downstream to 1.4k, creating a recovery reach between 0.6k and 1.39k. The historic recovery reach from 0k to 0.59k had not been fertilzed for 11 years, so it was then considered part of the reference reach after 1996. Reach information can be found in data for specific time periods. Water was filtered through a 25mm GF/F filter in the field; samples were acidified and refrigerated at 4C until analysis at the MBL until 1994. In 2011 cation samples started to be examined again at UVM.

Cation analysis used the method from Rains, Theodore, C. 1984. Atomic Absorption Spectrometry. Water Analysis, Vol II Edited by Roger A. Minear and Lawrence H. Keith.
An Absorption/Emission Spectrophotometer was used for analysis at the MBL.

While samples were collected for many years, cation analysis was not of highest priority and was therefore not measured every year. Data is available for the following years: 1989, 1990, 1993, 1994, 2000, 2011 & 2012.

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
Site Code LTER site code text        
River River text        
Date Date datetime   dd-mmm-yy    
Station Sampling location based on original 1983 phosphorus addition (in river kilometers) text        
Treatment Treatment reach based on the location of the dripper in 1985 (reference, recovery, or fertilized) text        
K+ (umol/L) Potassium ions number micromolePerLiter     -1111=no data | -9999=below detection limit
Na+ (umol/L) Sodium ions number micromolePerLiter     -1111=no data | -9999=below detection limit
Ca++ (umol/L) Calcium ions number micromolePerLiter     -1111=no data | -9999=below detection limit
Mg++ (umol/L) Magnesium ions number micromolePerLiter     -1111=no data | -9999=below detection limit
K+ (ueq/L) Potassium ions number microequivalentPerLiter     -1111=no data | -9999=below detection limit
Na+ (ueq/L) Sodium ions number microequivalentPerLiter     -1111=no data | -9999=below detection limit
Ca++ (ueq/L) Calcium ions number microequivalentPerLiter     -1111=no data | -9999=below detection limit
Mg++ (ueq/L) Magnesium ions number microequivalentPerLiter     -1111=no data | -9999=below detection limit
TOTAL CATS (ueq/L) Total Cations number microequivalentPerLiter     -1111=no data | -9999=below detection limit
Comments notes about the data text        

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