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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 http://ecosystems.mbl.edu/arc/terrest/biomass/index.shtml 

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.

Disclaimer

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 Poral
Dataset ID:1989_SoilCore13C-15N.02
Dataset Title:Arctic LTER 1989: del 13C and del 15N ratios in a peat core at 2 cm depth intervals at 4 locations along the Dalton Highway .
Investigator 1: 
First Name:Donald
Last Name:Schell
Organization:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Investigator 2: 
First Name:Bruce
Last Name:Barnett
Associate Investigators:
Keywords:peat, delta 13C, delta 15N
Abstract:del 13C and del 15N ratios were measured on a peat core at 2 cm depth intervals. Peat cores were taken at Imnavait Creek, Pump Station 3, the Happy Valley Steram and Olikok Dock Road along the Dalton Highway, Alaska.
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
Email: arc_im@mbl.edu
Online URL: http://ecosystems.mbl.edu/ARC/
DATA FILE INFORMATION:
Data File URL http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.10336&urlTail=terrest/delC-13/data/1989_SoilCore13C-15N.csv
Data File Name 1989_SoilCore13C-15N
Beginning Date 5/1/1989
End Date 9/1/1989
Number of Data Records 61
Other Files to Reference 1989_SoilCoreProperties
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: Log of changes: For Archival Use: DATE RECEIVED: DATA FILE ENTERED BY: DATA FILE VALIDATION: NAME: DATE:
Version 3: Updated to newer metadata form (with sites sheet). Fixed discrepency with variable names. CH March 2013.
Version 2: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 27Jan14
 
RESEARCH LOCATION:                                            
Location Name Imnavait Creek Pump Station 3 Happy Valley Stream Oliktok Dock Road Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One  
Geographic Description Lowland site 2 miles north of Imnavait Creek, Dalton Highway, Alaska, U.S.A. 68o 39'25"N, 149o 16'47"W. Lowland site 2 miles north of Pump Station 3, Dalton Highway, Alaska, U.S.A. 68o 52'08"N, 148o51'00"W. Riparian site near Happy Valley, Dalton Highway, Alaska, U.S.A. 68o 09'04"N, 148o 50'06"W. Coastal Plain site 0.5 miles north of drill 1Q on Oliktok Dock Road, Spine Road, Prudhoe Bay, Alaska, U.S.A. 70o 22'19"N, 149o 47'10"W. Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description  
Location Bounding Box                                            
West Bounding Coordinate                                            
East Bounding Coordinate                                            
North Bounding Coordinate                                            
South Bounding Coordinate                                            
OR if single point location                                            
Latitude 68.616 68.8689 69.15 70.371944 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Longitude -149.283 -148.85 -148.833333333333 -149.786111 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Elevation 884 In Meters 290 In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters  
Link to Google Map View on Google Map View on Google Map View on Google Map View on Google Map                                    
                                             
 
TAXONOMIC COVERAGE:
Organisms studied
 
Methods:Peat cores, approximately 15 cm diameter, were collected with a gasoline engine-driven SIPRE corer and long bladed nursery shovels. These were stored in plastic bags and refridgerated until processing.
The core was divided into three sections , one to be used for radiocarbon age, one for loss on ignition and del C-13, and the remainder to be kept for future needs. The sections were further divided into intervals of 2 cm for determination of the desired parameters.

For isotopic analysis 20 to 60 mg of peat was ground with 1.1 to 1.5 g of CuO per 30 mg of sample in a Wig-L-Bug dental amalgam mixer. The CuO sample mixture was then placed in a 5 cm by 6 mm quartz tube and inserted into a 30 cm by 9 mm quartz tube. To obtain sufficient quantities of nitrogen gas for anlaysis, 2 to 3 such tubes were processed for each sample. Tubes with samples were then dried for an additional 12 hours at 70 degrees C, evacuated wot < 1mTorr on a vacuum manifold and sealed with an oxygen-gas torch. The evacuated tubes were combusted in a muffle furnace at 870 degrees C for one hour and allowed to cool slowly for at least 12 hours.
Gases liberated by combustrion were separated and collected by cryogenic distillation on a vacuum manifold using the procedures described by Handley et al (1991). Briefely the sample were introduced into an evacuated line with a stainless steel tube cracker (Des Marais and Hayes, 1976). Carbon dioxide and water vapour were isolated by a liquid nitrogen cooled distilation loop and the remaining nitrogen was cleansed of any trace CO2 and H2O vapours by passage through a second liquid nitrogen cooled loop. N2 gas was compressed into a 15 cm by 6 mm borosilicate glass tube and sealed off with an oxygen-gas torch. Temperature of the CO2 trap was raised to about -80 deg. C and the CO2 sublimed from the trap. the CO2 was collected in glass tubes cooled with liquid N2 and sealed with a torch. Isotopic ratios of collected gasses were measured on a VG Isogas Sira-9 or a VG Series II dual inlet mass spectrometer.

Additional Files:
Please see file "1989_SoilCoreProperties" for Bulk density, percent organic carbon, moisture and other soil core properties.

REFERENCE:
Barnett, Bruce Alan, 1994. Carbon and Nitrogen Isotope Ratios of Caribou tissues, vascular plants and Lichens from Northern Alaska. Masters Thesis, University of Alaska, Fairbanks, School of Fisheries and Ocean Sciences. Supervisor Don Schell, Aug 3, 1994.

Reference Citations:
Schell, D.M., Barnett, B. 1993. Carbon dynamics in arctic Alaskan tundra. In: Landscape Function: Implications for ecosystem response to disturbance, a case study in arctic tundra. Reynolds, J.F., Tenhunen, J.D. eds., Springer-Verlag.
Handley, L.L, Scrigeour, C.M. Thornton, S.F., Sprent, J.I. 1991. Determination of the natural abundances of the stable isotopes of N-15 and 13C by mass spectrometry: A simplified manual method for the preparation of N2 and CO2. Functional Ecology, 5:119-124.
Des Marais, D.J., Hayes, J.M. 1976. Tube cracker for opening glass-sealed ampules under vacuum. . 48:1651-1652

Calculations:
del 13C = [(13C/12C sample / 13C/12C standard) - 1] x 1000
del 15N = [(15N/14N sample / 15N/14N standard) - 1] x 1000

Sampling locations & description (note that all original measurements recorded in degrees, minutes, seconds):
Lowland Imnavait: Lowland site 2 miles north of Imnavait Creek along the Dalton Highway; 68 degrees 39'25"N, 149 degrees 16'47"W
Pump Station 3: Lowland site 2 miles north of Pump Station 3 on the Dalton Highway; 68 degrees 52' 08" N, 148 degrees 51' 00" W
Happy Valley: Riparian site near Happy Valley,Dalton Highway, Alaska, U.S.A. 69 degrees 09' 04' N, 148 degrees 50' 06" W.
Oliktok Dock Road: Coastal Plain site 0.5 mile north of drill 1Q on Oliktok Dock Road, Spine Road, Prudhoe Bay, Alaska, U.S.A. 70 degrees 22' 19" N, 149 degrees 47' 10" W.

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
Original Site Code Original code for core site text        
Site Name Updated site name text        
Date Date datetime   dd-mmm-yyyy    
Depth depth of sample text        
DEL C-13 del 13C ratio number partPerThousand     .=Missing or Not Measured
DEL N-15 del 15N ratio number partPerThousand     .=Missing or Not Measured

Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.