Arctic LTER

Weather at Toolik

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 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.

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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 ID:	1986_to_presentgsbbag.6
Dataset Title:	Nitrogen mineralization was determined on Arctic LTERToolik and Sag River tussock tundra using the buried bag method, Toolik Field Station, Alaska, Arctic LTER 2003.
Investigator 1:
First Name:	Gus
Last Name:	Shaver
Organization:
Address line 2:	Marine Biological Lab
Address line 3:	7 MBL St
City:	Woods Hole
State:	Marain Biological Lab
Zip Code:	02543
Country:	USA
Investigator 2:
First Name:	Jim
Last Name:	Laundre
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Investigator 3:
First Name:	Knute
Last Name:	Nadelhoffer
Investigator 4:
First Name:	Anne
Last Name:	Giblin.
Associate Investigators:
Keywords:	Arctic tundra, nitrogen mineralization, bulk density, soil moisture, inorganic nutrients
Abstract:	Nitrogen mineralization was determined on LTER and Sag River tussock tundra using the buried bag method. Yearly bags have been deployed every August since 1990.
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.1428&urlTail=terrest/bulk/data/1986_to_presentgsbbag.csv
Data File Name	1986_to_presentgsbbag
Beginning Date	8/15/1996
End Date	8/18/2006
Number of Data Records	356
Other Files to Reference
Availability Status	1
Quality Control Information
Maintenance Description
Log of Changes:	9Feb98 updated with 97 values. Mar01 updated values to 2000. Jan04 updated file to 2002.Jl
	Version 2: Translated metadata into Excel metada worksheet, added attribute table and title. Jan 2006 Jiml
	Version 3: Added LTERNET Data Access server proxy for Excel and comma delimited data files.
	Version 4: Upadte LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
	Version 5: Added up to 2006 data Jiml
	Version 6: Updated units to current standards; Missing values changed to #N/A. Updated metadata form to newer version (without site sheet).CH 24 Jan 2013. Updated to newer metadata with site sheet. CH March 2013.

RESEARCH LOCATION:

Location Name

LTER Moist Acidic Tussock Tundra

Sagavanirktok River

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Geographic Description

Arctic LTER, Toolik Field Station, North Slope Alaska(68 degrees 38'N, 149 degrees 34'W, elevation 760 m). Moist Acidic Tussock Tundra.

Alaska Department of Transportation Sagavanirktok River Camp, North Slope of Alaska (68 degrees 46'N, 148 degrees 52'W)

Enter Description

Location Bounding Box

West Bounding Coordinate

East Bounding Coordinate

North Bounding Coordinate

South Bounding Coordinate

OR if single point location

Latitude

68.62405

68.75885

In Decimal Degrees

Longitude

-149.61058

-148.84182

In Decimal Degrees

Elevation

750

457

In Meters

Link to Google Map

View on Google Map


TAXONOMIC COVERAGE:
Organisms studied

Methods:	Paired cores (within 15 cm of each other and 5.95cm diameter) of moss dominated inter-tussock were taken from Tussock tundra in the Arctic LTER site near Toolik Lake AK and in tussock tundra near the Sag River DOT maintenance Camp 25 miles Northeast of Toolik. Core length was measured in the field. Live plant material and mineral soil were removed. One core was placed in a polyethylene bag, inserted back in the hole, covered with moss, and flagged. Cores were incubated one year. The other core was taken back to lab for analysis. This core was used as an initial for the bagged core. For NH4-N and NO3-N extractions 100 mls of KCl (2 N KCl) is added to about 20 grams wet weight of homogenized soil. For PO4-P 100 mls of 0.025 N HCl was used for extraction. KCl extracts were shaken for 4 hours while HCl extracts were shaken for only 5 minutes. All extracts were immediately filtered through Whatman No. 42 filter paper. At the Tussock Site 2 bags per block and at the Sag 4 bags per plot were deployed with initials being collected at the same time. Cores were 5.95 cm in diameter and include organic soil only, i.e., no mineral or green, live plants. Notes: This file is a complied files from the individual year files. Each year's initials are complied in 1986_to_currentgsext.dat. Phosphorus in buried bags was not measured every year.

Data Table

Variable Name	Variable Description	Data Type	Units	DateTime Format	Code Information	Missing Value Code
Date	Date of collection	datetime		dd-mmm-yyyy
Location	Location of site; Sag or Toolik.	text
Site	Landscape toposequence Site number for Sag; for Toolik same as block number	text
Block	Block number for Toolik; plot number for Sag.	text
Rep	Replicate number for core.	text
Treatment	Plot treatment.	text
Moisture	Soil moisture calculated from core on per cent mass basis.	number	percent			#N/A
BulkDensity	Bulk Density of core	number	gramPerCentimeterCubed			#N/A
Length	the length of the core determined by measuring the core hole (excluding plants)	number	centimeter			#N/A
dlNH4Nug_g	difference (delta) between previous initial NH4-N extract and bagged NH4-N extract	number	microgramPerGram			#N/A
dlNO3Nug_g	difference (delta) between previous initial NO3-N extract and bagged NO3-N extract	number	microgramPerGram			#N/A
dlTNug_g	total delta N = delta NO3 ug/g + delta NH4	number	microgramPerGram			#N/A
dlPO4Pug_g	difference (delta) between previous initial PO4-P extract and bagged PO4-P extract	number	microgramPerGram			#N/A
dlNH4Ng_m2	dlNH4Nug_g * bulk density * length * 10000 cm2/m2 * .000001 g/ug	number	gramPerMeterSquared			#N/A
dlNO3Ng_m2	dlNO3Nug_g * bulk density * length * 10000 cm2/m2 * .000001 g/ug	number	gramPerMeterSquared			#N/A
dlTNg_m2	dlNH4Ng_m2 + dlNO3Ng_m2	number	gramPerMeterSquared			#N/A
dlPO4Pg_m2	dlPO4P4ug_g * bulk density * length * 10000 cm2/m2 * .000001 g/ug	number	gramPerMeterSquared			#N/A
Comments	notes and comments about the data	text

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