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:	98gthnuts
Dataset Title:	Depth profiles of NO-3, NH-4 ,PO-4, TDN, TDP, PP, PN and PC for Geomorphic trophic hypothesis (GTH) lakes 82, 83, 84, 85, 86, 87, 88, 89, 90, and 91 in 1998, Arctic LTER 1998.
Investigator 1:
First Name:	Anne
Last Name:	Giblin
Address line 1:	7 MBL St.
Address line 2:
Address line 3:
City:	Woods Hole
State:	MA
Zip Code:	02543
Country:	USA
Associate Investigators:	Neil Bettez, Jeff Berardinis, Amanda Wilson
Keywords:	phosphorus, ammonia, nitrite, nitrate, TDN, TDP, PP, PN, PC, nutrients.
Abstract:	Depth profiles of NO-3, NH-4 ,PO-4, TDN, TDP, PP, PN and PC for Geomorphic trophic hypothesis (GTH) lakes 82, 83, 84, 85, 86, 87, 88, 89, 90, and 91 in 1998.
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.478&urlTail=lakes/nutrients/data/98gthnuts.dat
Data File Name	98gthnuts
Beginning Date	5/1/1998
End Date	9/1/1998
Number of Data Records
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes:	Log of changes: For Archival Use: DATE RECEIVED: Aug, 1998 DATA FILE ENTERED BY: Neil Bettez DATA FILE VALIDATION: Neil Bettez NAME: Neil Bettez DATE: Aug 1998
	Version3 Added the attribute metadata.

RESEARCH LOCATION:		Site 2
Geographic Description	Geomorphic trophic hypothesis (GTH) lakes 82, 83, 84, 85, 86, 87, 88, 89, 90, and 91.
Location Bounding Box
West Bounding Coordinate
East Bounding Coordinate
North Bounding Coordinate
South Bounding Coordinate
OR if single point location
Latitude
Longitude
Elevation

TAXONOMIC COVERAGE:
Taxonomic Protocols
Organisms studied
Methods:	Water samples were collected at depth with a Van Dorn. Inorganic nutrient samples were filtered in the field using 25 mm .2um Nalgene syringe filters. Phosphorus, and ammonia samples were kept at 4 C in amber HDPE bottles until being run according to standard methods (Strickland and Parsons, 1972). Nitrate samples were frozen and shipped to MBL. Nitrate/nitrite was determined on an alp chem autoanalyzer using an OTCR with method (AlpKem RFA method A303-S171). Total dissolved Nitrogen samples were fixed with 100 ul/ 60ml 6N Ultrex HCL, shipped to MBL, and stored at -20 C. Samples were was digested with potassium persulfate and nitrate + nitrite and nitrite determined on an alp chem. autoanalyzer using a open tubular cadmium reactor (OTCR) method (PN 000623 #8-92 rev B). Total dissolved phosphorus samples were fixed with 100 ul / 60 ml using 6N Ultrex HCL, shipped to MBL, and stored at 4 C. Particulate Phosphorus, nitrogen and carbon samples were collected on pre-combusted 25 mm GF/F filters. Filters were dried overnight at 55 C prior to shipment. Particulate phosphorus was determined using methods of Stainton et al., (1974). Particulate Nitrogen and carbon were run on a Perkin elmer CHN analyzer. Reference Citations: AlpKem Rapid flow analysis method A303-S171 for Nitrate AlpKem Rapid flow analysis method PN 000623 #8-92 rev B for TDN R.G. Wetzel and G.E. Likens. 1979. Limnological Methods. Saunders. Philadelphia. A quantification of low-level ammonia in freshwaters. Standard Methods 1985, p 382. Stainton, M.P. M.J. Capel, F.A.J.1974. Armstrong The chemical Analysis of fresh water. Fish Res. Board Can. Misc.Spec. Pub. 25: 67. 1974. Strickland, J. D. and Parsons, T. R., (Eds.) 1972. A practical handbook of seawater analysis. second edition. Fisheries Research Board of Canada, Ottawa. Sampling Description. None

Data Table

Variable Name	Variable Description	Units	Measurement Scale	Code Information	Number Type	DateTime Format	Missing Value Code	Missing Value Code Explanation
site	site of measurement		nominal
Lake	Lake sampled		nominal
depth (m)	depth sampled	meter	ratio		real
Date	Date		datetime			dd-mmm-yyyy
NH4-N (uM)	ammonium	micromolePerLiter	ratio		real
SRP/ PO4 (uM)	SRP	micromolePerLiter	ratio		real
NO-3 (uM)	nitrate	micromolePerLiter	ratio		real
TDN (uM)	Total dissolved N	micromolePerLiter	ratio		real
TDP (uM)	Total dissolved P	micromolePerLiter	ratio		real
PP (umole/L)	Particulate phosphorus	micromolePerLiter	ratio		real
Total PN (ug/L)	Particulate Nitrogen	microgramPerLiter	ratio		real
Total PC (ug/L)	Particulate Carbon	microgramPerLiter	ratio		real
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