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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:1990_present_TW_Thaw_Kling.07
Dataset Title:Tussock Watershed Thaw Depth Survey Summary for 1990 to present, Arctic LTER, Toolik Research Station, Alaska.
Investigator 1: 
First Name:George
Last Name:Kling
Organization:University of Michigan
Address line 2:Department of Ecology and Evolutionary Biology
Address line 3:830 North University
City:Ann Arbor
State:MI
Zip Code:48109-1048
Country:United States of America
Investigator 2: 
First Name:Chris
Last Name:Wallace
Organization:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Investigator 3: 
First Name:Amanda
Last Name:Field
Investigator 4: 
First Name:Jim
Last Name:Laundre
Associate Investigators:
Keywords:moist tussock tundra, thaw depth, permafrost, arctic tundra
Abstract:Starting in 1990 thaw depth has been measured in a small watershed of tussock tundra every July 2nd and August 11th. The UTM stake grid (stakes are in a grid at every 100 meters) was used to locate the points . All measured depths are in cm. Measurements are made within a 20 cm radius of each location point. All the measurements are then averaged into a single value for the day.
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.1019&urlTail=landwater/soils/data/1990_present_TW_Thaw_Kling.csv
Data File Name 1990_present_TW_Thaw_Kling.xls
Beginning Date 7/2/1990
End Date 8/11/2009
Number of Data Records 40
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: Entered metadata into new metadata form.
Version 3: LTERNET Data Access server proxy changed from das.lternet.edu to metacat.lternet.edu.
Version 4: Added LTERNET Data Access server proxy for Excel files.
1/26/2010 - JMK Added 2007-2009 data
Version 5: Update LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url. Feb 210 JimL
Version 6: Corrected the Methods since it was the Imnavait Creek method. Changed the Title… to present, Updated the form to the new version. Jim L 22Aug11
Version 7: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 15Jan14
 
RESEARCH LOCATION:                  
Location Name TW lower   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 Tussock Watershed is a small inlet stream approximately 500 meters south of Toolik Lake (southwest of Toolik Field Station) that flows into Toolik Lake (approximately 68º 30' N, 149º 15'W). 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 68.62356 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Longitude -149.6173 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Elevation 759 In Meters In Meters In Meters In Meters In Meters In Meters In Meters  
Link to Google Map View on Google Map                
                   
 
TAXONOMIC COVERAGE:
Organisms studied
 
Methods:Sampling Description:

Starting in 1990 thaw depth has been measured in a small watershed of tussock tundra every July 2nd and August 11th. The UTM stake grid (stakes are in a grid at every 100 meters) was used to locate the points. A ruled stainless steel rod was inserted in non tussock microhabitat until the frozen layer was reached, and the distance was measured to the top of the organic mat (beneath the uppermost moss). Two measurement were made at each point from 1990-1999, and three measurements were made at each point from 2000 on. All measured depths are in cm. Measurements are made within a 20 cm radius of each location point. All the measurements are then averaged into a single value for the day.

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
Date Day, Month, and Year that sample was taken datetime   dd-mmm-yyyy   .=Missing or Not Measured
Calendar_Day Day of Year number nominalDay     .=Missing or Not Measured
Mean Average Thaw Depth for the Sampling number centimeter     .=Missing or Not Measured
Standard_Devation Standard Deviation of Thaw Depth for the Sampling number centimeter     .=Missing or Not Measured
Standard_Error Standard Error of Thaw Depth for the Sampling number centimeter     .=Missing or Not Measured
N Number of Measurements in the Sampling number centimeter     .=Missing or Not Measured
Minimum Minimum Thaw Depth for the Sampling number centimeter     .=Missing or Not Measured
Maximum Maximum Thaw Depth for the Sampling number centimeter     .=Missing or Not Measured
%CV Coeffiecent of Variation number percent     .=Missing or Not Measured

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