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.

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 ID:	1990-currentpeknut.07
Dataset Title:	Soluble reactive phosphorus, ammonium, and nitrate data from the Kuparuk River summers 1990-2010, Arctic LTER 2010.
Investigator 1:
First Name:	Bruce
Last Name:	Peterson
Address line 1:	Marine Biological Lab
Address line 2:	7 MBL St.
Address line 3:
City:	Woods Hole
State:	MA
Zip Code:	02543
Country:	USA
Investigator 2:
First Name:	Breck
Last Name:	Bowden
Address line 1:	University of Vermont
Address line 2:	304 Aiken Center
City:	Burlington
State:	VT
Zip Code:	05405
Country:	USA
Associate Investigators:	Elissa Schuett, Adrian Green, Karie Slavik
Keywords:	phosphorus, nitrate, ammonium, PO4, NO3, NH4, nutrients, Kuparuk, River
Abstract:	Samples from designated stations from the Kuparuk River were collected during each summer from 2000 to current time. Station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference reach, a reach that has been recovering from phosphorus addition since 1996, and a reach that has had phosphorus added since 1983. Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Three sampling dates occurred each summer; once in June prior to the start of fertilization and once each in July and August. Water samples were analyzed for soluble reactive phosphate, ammonium, and nitrate.
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.1221&urlTail=streams/nutrients/data/1990-currentpeknut.csv
Data File Name	1990-currentpeknut.dat
Beginning Date	6/1/1990
End Date	9/1/2010
Number of Data Records	1195
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes:	September 29, 2004. A. Green. - 2003 NH4 data are still under review and will be added at a later date.
	November 9, 2004. A. Green. - 2004 NO3 data are still under review and will be added at a later date.
	Version 2: Update the Title and added the attribute table. Also combined 203- 206 data. 17Nov06 JimL
	Version 3: Added 2006 NO3 data, all 2007 data, updated location coordinates, abstract, and methods. 3Apr08 EBS
	Version 4: Added 2008-2009 data. 28Oct09 EBS
	Version 5: changed file to include older data. 8Jan10 EBS
	Version 6: Upadte LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
	Ver 7 updated to eml2.1 changed date format to sql format JimL 23 May12

RESEARCH LOCATION:		Site 2
Geographic Description	Kuparuk River, location of original 1983 dripper, from which all other stations are named (negative stations are upstream, positive stations are downstream in stream kilometers away from the dripper
Location Bounding Box
West Bounding Coordinate
East Bounding Coordinate
North Bounding Coordinate
South Bounding Coordinate
OR if single point location
Latitude	68.639104
Longitude	-149.394326
Elevation

TAXONOMIC COVERAGE:
Taxonomic Protocols
Organisms studied
Methods:	Water samples were collected at designated stations along the Kuparuk River. Sample reaches include a reference reach upstream of the original phosphorus dripper, a recovery reach that has not had phosphorus added since 1996, and a fertilized reach that has had phosphorus added since 1983. Water was filtered through a 25mm GF/F filter in the field; samples were analyzed upon return to Toolik Field Station for soluble reactive phosphate and ammonium, using manual chemistry methods listed in the LTER database protocols. SRP was analyzed using a Cary spectrophotometer. Ammonium was analyzed using a fluorometric method (Holmes et al. 1999). Nitrate/nitrite samples were frozen and run using the QuikChem METHOD 31-1-7-04-1-C on a Lachat at the Marine Biological Laboratory in Woods Hole, MA. See current protocols at http://ecosystems.mbl.edu/ARC Notes: 1990-96 --- Nutrients were analyzed using a Technicon autoanalyzer II at Toolik. 1997 --- Phosphorus and ammonium were analyzed using manual methods at Toolik (molybdate colorimetric for phosphorus and phenol for ammonium). Nitrate/nitrite was analyzed on a Lachat autoanalyzer. 1998 --- NH4 was analyzed using the phenol method only, NH4 data may not be compared to later years when the method was changed 1999 --- NH4 was analyzed using both the Homles et al. 1999 OPA method and the phenol method to compare methods 2000 --- NH4 was analyzed using only the Homles et al 1999 OPA method 2003 --- NH4 data are still under review and will be added at a later date. September 29, 2004. A. Green. - 2004 --- Nitrate data have not yet been added to this file as of 11/9/04. (Nitrate samples were reanalyzed and the file has been updated - 25Oct09 - EBS) 2005 --- None 2006 --- June NH4 data was unreliable and is excluded from this dataset. 2006 NO3 samples have not been analyzed as of Nov. 1, 2006. 2006 --- NO3 samples have been analyzed and added to the dataset 2007 --- Dataset updated 3 April 2008 - EBS 2008 --- Dataset updated 10 March 2009 - EBS 2009 --- Dataset updated 13 October 2009 - EBS 2010 --- Dataset updated 8 January 2010 with 2000-2002 data - EBS 2010 --- Dataset updated 29 November 2010 with 2010 data - EBS Reference Citations: R.G. Wetzel and G.E. Likens. 1979. Limnological Methods. Saunders. Philadelphia. APHA. 1985. Standard Methods. Boyd. Albany. R.M. Holmes, A. Aminot, r. Kerouel, B.A. Hooker, and B.J. Peterson. 1999. A simple and precise method for measuring ammonium in marine and freshwater ecosystems. Can. J. Fish. Aquat. Sci. 56: 1-8.

Data Table

Variable Name	Variable Description	Units	Measurement Scale	Code Information	Number Type	DateTime Format	Missing Value Code	Missing Value Code Explanation
Site Code	site of measurement		nominal
River	site of measurement (named)		nominal
Date	Date		datetime			dd-mon-yyyy
Station (km)	Station on river in km from 1983 dripper. See comments for additional information		nominal
uM_SRP	soluble reactive phosphate	micromolePerLiter	ratio		real		.	.=not measured
uM_NH4_AA	ammonium analyzed using the flame AA method	micromolePerLiter	ratio		real		.	.=not measured
uM_NH4_phenol	ammonium analyzed using the phenol method	micromolePerLiter	ratio		real		.	.=not measured
uM_NH4_OPA	ammonium analyzed using the OPA method	micromolePerLiter	ratio		real		.	.=not measured
uM_NO3	nitrate	micromolePerLiter	ratio		real		.	.=not measured
Comments	Notes about data		nominal
1983 P-dripper location	Treatment reach based on the location of the dripper in 1985 (reference or fertilized)		nominal
1985 P-dripper location	Treatment reach based on the location of the dripper in 1985 (reference, recovery, or fertilized)		nominal
1996 P-dripper location	Treatment reach based on the location of the dripper in 1996 (reference, recovery, or fertilized)		nominal
	Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.