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.
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 Title:||Tussock Watershed Thaw Depth Survey Summary for 1990 to present, Arctic LTER, Toolik Research Station, Alaska.|
|Investigator 1:|| |
|Organization:||University of Michigan|
|Address line 2:||Department of Ecology and Evolutionary Biology|
|Address line 3:||830 North University|
|Country:||United States of America|
|Investigator 2:|| |
|Address line 2:|
|Address line 3:|
|Investigator 3:|| |
|Investigator 4:|| |
|Keywords:||Toolik Lake, tussock tundra, thaw depth, permafrost|
|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
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|
|Number of Data Records||369|
|Other Files to Reference|
|Quality Control Information|
|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|
|RESEARCH LOCATION:||Site 1||Site 2|
|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).|
|Location Bounding Box|
|West Bounding Coordinate|
|East Bounding Coordinate|
|North Bounding Coordinate|
|South Bounding Coordinate|
|OR if single point location|
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.
|Variable Name||Variable Description||Data Type||Units||DateTime Format||Code Information||Missing Value Code|
|Date||Day, Month, and Year that sample was taken||datetime||ddmmmyyyy||.|
|Calendar_Day||Day of Year||number||nominalDay||.|
|Mean||Average Thaw Depth for the Sampling||number||centimeter||.|
|Standard_Devation||Standard Deviation of Thaw Depth for the Sampling||number||centimeter||.|
|Standard_Error||Standard Error of Thaw Depth for the Sampling||number||centimeter||.|
|N||Number of Measurements in the Sampling||number||centimeter||.|
|Minimum||Minimum Thaw Depth for the Sampling||number||centimeter||.|
|Maximum||Maximum Thaw Depth for the Sampling||number||centimeter||.|
|%CV||Coeffiecent of Variation||number||percent||.|