Arctic LTER Database

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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.

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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 ID:	1993_to_currentsoilthaw.05
Dataset Title:	Late season thaw depth measured in the ARC LTER moist acidic tussock experimental plots at Toolik Field station, AK Arctci LTER 1993 to current year.
Investigator 1:
First Name:	Gus
Last Name:	Shaver
Organization:	The Ecosystems Center
Address line 2:	MBL
Address line 3:	7 MBL St.
City:	Woods Hole
State:	MA
Zip Code:	02543
Country:	USA
Investigator 2:
First Name:	Jim
Last Name:	Laundre
Organization:	The Ecosystems Center
Address line 2:	MBL
Address line 3:	7 MBL St.
City:	Woods Hole
State:	MA
Zip Code:	02543
Country:	USA
Associate Investigators:
Keywords:	arctic tundra, thaw depth, soil warming, soil fertilization, disturbance
Abstract:	Late season thaw depth was measured in the ARC LTER experimental plots (Moist Acidic Tussock, Moist Non-acidicTussock, Moist Non-acidic Non-tussock, Wet Sedge) at Toolik Lake, AK using a thaw probe.
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.1610&urlTail=terrest/bulk/data/1993_to_currentsoilthaw.csv
Data File Name	1993_to_currentsoilthaw
Beginning Date	8/20/1993
End Date	8/13/2012
Number of Data Records	991
Other Files to Reference
Availability Status	1
Quality Control Information
Maintenance Description	There is gap between 1993 and 1997 when thaw was not measured.
Log of Changes:	Updated Metadata sheet
	Version 1 Created new metadata excel sheet. 5apr05 JimL
	Version 2: Added LTERNET Data Access server proxy for Excel and comma delimited data files.
	Version 3: Upadte LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
	Version 4: Added data from 2006 - 2009 JimL Mar 2010
	Version 5: Changed cell L470 from "3/28" to "28". Updated metadata form to newer version (without site sheet). Updated data to 2012. CH 2 Feb 2013. Updated to newer metadata with site sheet. CH March 2013.

RESEARCH LOCATION:
Location Name	LTER Wet Sedge Tundra Block 1	LTER Wet Sedge Tundra Block 2	LTER Moist Acidic Tussock Tundra	LTER Moist NonAcidic NonTussock Tundra	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	Arctic LTER Experimental Plots: Wet Sedge Tundra - Block 1 Northeast corner near Toolik Field Station, North Slope, Alaska.	Arctic LTER Experimental Plots: Wet Sedge Tundra Block 2 Northeast corner near Toolik Field Station, North Slope, Alaska.	Arctic LTER Experimental Plots: Moist Acidic Tussock Tundra (MAT) Northeast corner block 1 near Toolik Field Station, North Slope, Alaska.	Arctic LTER Experimental Plots: Moist NonAcidic NonTussock Tundra (MNNT) Northeast corner Block 1 near Toolik Field Station, North Slope, Alaska.	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	68.625441	68.647622	68.624411	68.634531	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees
Longitude	-149.602873	-149.577298	-149.609589	-149.642058	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees
Elevation	717	719	750	748	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:	Plots are setup as indicated below, with annual fertilization treatments of 10 g/m2 Nitrogen (as NH4NO3) and 5 g/m2 Phosphorous (as triple superphosphate) for all N, P and NP treatments. Greenhouses and shadehouses are set up annually in early June and removed in mid August. Sites: Moist AcidicTussock Tundra Blocks 1-4 (CT, N, P, NP, GH, GHNP, Shade, and ShadeNP treatments) Treatments began summer of 1989. Plots size are 5x20 meters plot/treatment except for GH, GHNP, Sahde, and ShadeNP which are 2.4 x 4.9 meters. Exclosures of large mesh and small mesh fences: (EXCT fence, EXCT nofence, EXNP fence and EXNP nofence) Treatments began in 1997. Plot size are 5x10 meters. All fences are large mesh with an inner 5x5 meter small mesh fence. Moist Non-Acidic Non-Tussock Tundra Blocks 1-3 (CT, N, P and NP treatments) Treatments began summer of 1997. Plots size are 5x20 meters plot/treatment. Moist Non-AcidcTussock Tundra Blocks 1-3 (CT, N, P and NP treatments) (GH and GHNP treatments are on block 1 and 2 only) Treatments began summer of 1997. Plots size are 5x20 meters plot/treatment except for GH and GHNP which are 2.4 x 4.9 meters. Wet Sedge Block 1 - Toolik Inlet (CT, N, P, NP, GH, GHNP, and Shade treatments) Indicated as "Block 1" Treatments began summer of 1989; one 5x10m plot/treatment Block 2 - Toolik Outlet (Same treatments) "Block 2" Treatments began summer of 1989; one 5x10m plot/treatment A total of 8 measurements were made with a stainless steel probe. All measurement made in inter-tussock mossy area; not wet hollows. Depths for each plot were taken along the 20 meter sides every at 2.5, 7.5,12.5,17.5 meters. For greenhouses and shade houses one depth was taken between every set of rafters (every 1.2 meters). No measurements were made in the shrub or heath experimental plots due to gravel and rocks. NOTES AND COMMENTS: The tussock greenhouses and shade houses were measured after the plastic and shade cloth were removed. 2006 Measurements were not made in Non- Acidic sites becasue thaw was deep enough that a rock layer was reached. 2008 No measuremnets in Non acidic tundra. 2009 Thaw in the low fertilization plots were made.

Data Table

Variable Name	Variable Description	Data Type	Units	DateTime Format	Code Information	Missing Value Code
Date	Date that the thaw depth was measured.	datetime		dd-mmm-yyyy
Year	Year of measurement	datetime		yyyy
Site	Site of measurement. See methods for details	text
Block	Treatment block	text
Treatment	Plot treatment. See methods for details	text
Plot	Plot treatment plus replication number if applicable. See methods for details	text
Thaw cm 1	Thaw depth in centimeters for replicate 1	number	centimeter			na
Thaw cm 2	Thaw depth in centimeters for replicate 2	number	centimeter			na
Thaw cm 3	Thaw depth in centimeters for replicate 3	number	centimeter			na
Thaw cm 4	Thaw depth in centimeters for replicate 4	number	centimeter			na
Thaw cm 5	Thaw depth in centimeters for replicate 5	number	centimeter			na
Thaw cm 6	Thaw depth in centimeters for replicate 6	number	centimeter			na
Thaw cm 7	Thaw depth in centimeters for replicate 7	number	centimeter			na
Thaw cm 8	Thaw depth in centimeters for replicate 8	number	centimeter			na
Average Thaw	Average thaw depth in centimeters for all replicates	number	centimeter			na
SERR	Standard error of the mean for thaw depth	number	centimeter			na
Comments	Comments about individual datum points	text
	Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.