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Arctic LTER Database

Arctic LTER Database

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:1977_ArcticLTER_lakes_chl.02
Dataset Title:Primary production data for Toolik Lake and surrounding lakes near the Arctic LTER site during the summer of 1977
Investigator 1: 
First Name:Anne
Last Name:Giblin
Organization:Marine Biological Laboratory
Address line 2:The Ecosystems Center
Address line 3:7 MBL Street
City:Woods Hole
Zip Code:02543
Investigator 2: 
First Name:Michael
Last Name:Miller
Address line 2:
Address line 3:
Zip Code:
Investigator 3: 
First Name:Rowe
Last Name:William
Investigator 4: 
First Name:Bernard
Last Name:Moller
Associate Investigators:
Keywords:chlorophyll a, pheophytin, primary production, arctic lakes, lakes
Abstract:Primary production data for Toolik Lake and surrounding lakes near the Arctic LTER site during the summer of 1977.
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 1977_ArcticLTER_lakes_chl.xls
Beginning Date 5/1/1977
End Date 9/1/1977
Number of Data Records 97
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: Log of changes: This data was taken from the file 89mitlsv.dat and separated out by year by Neil Better on Jan 26, 1995 77tlkchl For Archival Use: DATE RECEIVED: DATA FILE ENTERED BY: DATA FILE VALIDATION: NAME: Julie Pallant DATE: 8Oct91
Version 1: Metadata updated to newer version (with sites sheet). Data from individual lakes compiled into one spreadsheet for summer 1977 called "1977_ArcticLTER_lakes_chl". Data columns reordered to match other years. CH 4 Apr 2013.
Version 2: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 15Jan14
Location Name Toolik  
Geographic Description Toolik main station  
Location Bounding Box    
West Bounding Coordinate    
East Bounding Coordinate    
North Bounding Coordinate    
South Bounding Coordinate    
OR if single point location    
Latitude 68.629961 In Decimal Degrees
Longitude -149.612633 In Decimal Degrees
Elevation 719 In Meters
Link to Google Map View on Google Map  
Organisms studied
Methods:Water samples were taken weekly from Toolik lake. The sampling depths for the Control side were 0, 1, 3, 5, and 6 meters and the Treatment side were 0, 1, 3, 5, and 7 meters. Samples were filtered through a Gelman A/E glass fiber filter. Filters were extracted in the dark for 24 hours and read on a Turner 111 fluorometer. Algae was incubated for 24 hours, filtered onto a .45 um Metricel filter and counted with a liquid scintillation counter.

Reference Citations: R.G. Wetzel & G.E. Likens. 1979. Limnological Methods. Saunders. Philadelphia.

Sampling Description.


Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
Site Code site code text        
Lake Site of measurement, water samples unless specified as sediment ("sed") samples text        
Depth (m) Depth number meter     .=Missing or Not Measured
Date Date datetime   DD-MMM-YY    
Julian Day Julian day number number     .=Missing or Not Measured
Corrected chl a (ug/L) Corrected Chlorophyll a, active chl a number microgramPerLiter     .=Missing or Not Measured
Pheo (ug/L) Pheophytin number microgramPerLiter     .=Missing or Not Measured
Total chl a (ug/L) Total chl a (uncorrected for pheophytin) number microgramPerLiter     .=Missing or Not Measured
PPROD (mgC/m3/d) Rate of primary production (mg availabe C/m3/d) number microgramPerLiterPerDay     .=Missing or Not Measured
Notes Notes text        

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