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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 via LTER Data Poral
Dataset ID:1999_ArcticLTER_Lakes_nuts.02
Dataset Title:Nutrient and chemical data for various lakes near Toolik Research Station, Arctic LTER, Summer 1999.
Investigator 1: 
First Name:Anne
Last Name:Giblin
Organization:Marine Biological Laboratory
Address line 2:Ecosystems Center
Address line 3:7 MBL Street
City:Woods Hole
State:MA
Zip Code:02543
Country:United States of America
Investigator 2: 
First Name:Neil
Last Name:Bettez
Organization:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Investigator 3: 
First Name:Jennifer
Last Name:Wasik
Investigator 4: 
First Name:Shana
Last Name:Rhapaport
Associate Investigators:
Keywords:phosphorus, ammonium, nitrate, total dissolved nitrogen, total dissolved phosphorus, particulate phosphorus, particulate nitrogen, particulate carbon, lakes, arctic lakes, inorganic nutrients
Abstract:

Depth profiles of NO-3, NH-4, PO-4, TDN,
TDP, PP, PN and PC for lakes in 1999.
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.10164&urlTail=lakes/nutrients/data/1999_ArcticLTER_Lakes_nuts.csv
Data File Name 1999_ArcticLTER_Lakes_nuts.xls
Beginning Date 5/1/1999
End Date 9/1/1999
Number of Data Records 266
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: Log of changes: For Archival Use: DATE RECEIVED: September, 1999 DATA FILE ENTERED BY: Neil Bettez DATA FILE VALIDATION: NAME: Neil Bettez DATE: September, 1999
Data from all lakes compiled. Updated to new metadata form (with sites). CH March 2013
Version 2: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 27Jan14
 
RESEARCH LOCATION:                                                                                            
Location Name Toolik Central E 01 E 04 E 05 E 06 I1 I2 I3 I4 I5 I6 I7 I8 I swamp N 01 N 02 S 01 S 02 S 06 S 07 S 11 NE 01 NE 02 NE 9B NE 12 Toolik inlet Milkyway upper I swamp inlet I swamp outlet I1 into I3 I2 into I3 I2 outlet I3 outlet I4 outlet I5 outlet I6 outlet I7 outlet I8 outlet I4 into I5 I5 into I6 I6 inlet west I7 into I9 I8 headwater I8 inlet I8 into I9  
Geographic Description Toolik Lake, Main Station Lake E1 Lake E4 Lake E5 Lake E6 Lake I1 Lake I2 Lake I3 Lake I4 Lake I5 Lake I6 Lake I7 Lake I8 Lake ISwamp Lake N1 Lake N2 Lake S1 Lake S2 Lake S6 Lake S7 Lake S11 Lake NE1 Lake NE2 Lake NE9B Lake NE12 Toolik inlet Milky way up I swamp inlet I swamp outlet I1 into I3 I2 into I3 I2 outlet I3 outlet I4 outlet I5 outlet I6 outlet I7 outlet I8 outlet I4 into I5 I5 into I6 I6 west I7 into I9 I8 head I8 inlet I8 into I9  
Location Bounding Box                                                                                            
West Bounding Coordinate                                                                                            
East Bounding Coordinate                                                                                            
North Bounding Coordinate                                                                                            
South Bounding Coordinate                                                                                            
OR if single point location                                                                                            
Latitude 68.629961 68.6261956028 68.6277698106 68.642611 68.6434270583 68.5687130789 68.5713195633 68.5755366301 68.57956715 68.5873874391 68.5965924039 68.6008747982 68.6101575207 68.610781 68.6398939358 68.6409472345 68.6245359666 68.6271690786 68.6293797816 68.6300627447 68.630148049 68.64378317 68.6463250055 68.6526454831 68.65 68.6256 68.62016667 68.61035 68.611683 68.574 68.57478333 68.572546 68.57754 68.58143 68.589087 68.598684 68.60183 68.611408 68.58423333 68.59491667 68.59688333 68.61818333 68.5736666666667 68.60853333 68.61838333  
Longitude -149.612633 -149.555347706 -149.497737003 -149.458079 -149.440564592 -149.58807625 -149.565881618 -149.583644456 -149.58405938 -149.589625877 -149.59264335 -149.596582063 -149.582211513 -149.600742 -149.606965643 -149.625086307 -149.602166091 -149.611352962 -149.641623295 -149.644441789 -149.650579145 -149.589494362 -149.582722439 -149.599473662 -149.616666666667 -149.59605 -149.568166 -149.599766 -149.599254 -149.583566 -149.58205 -149.570268 -149.582003 -149.5861 -149.589219 -149.599853 -149.596713 -149.590132 -149.5836 -149.586316 -149.60125 -149.596766 -149.537166666667 -149.587633 -149.5965  
Elevation 719 762   800 792 785 785 774 770 767 754 742 744 736 731 724 720 720 731 731 750 716 716 747 699 719 739 736 736 774 774 785 774 770 767 754 742 744 770 754 754 728 808 744 728  
Link to Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map View on Google Map  
                                                                                             
 
TAXONOMIC COVERAGE:
Organisms studied
 
Methods:

Water samples were collected at each depth using a Van Dorn. Inorganic nutrient
samples (ammonium and phosphorus) were filtered in the field using 25 mm .2um
Nalgene syringe filters. Fiterd was was used for both phosphorus samples, which
were analyzed using standard methods (Strickland and Parsons1972), and ammonium
samples, which were analyzed using Strickland and Parsons 1985. Ammonium
samples were also analyzed using unfiltered water samples with a modified method
according to Holmes at al 1999.
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 preserved 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
Holmes, R. Aminot, A. Kerouel, R. Hooker, B. Peterson, J. 1999. A simple and
precise method for measuring ammonium in marine and fresh water ecosystems.
Can. J. Fish. Aquat. Sci. 56: 1801-1808
Stainton, M. P. and Capel, M. J., 1974. Particulate Phosphorus. In: The chemical
Analysis of fresh water. (Eds. : Stainton, M, P. Capel, M, J) Fisheries Research
Board of Canada, Ottawa, 67-70.
Strickland and Parsons. 1985. A quantification of low-level ammonia in
freshwaters. Standard Methods 1985, p 382.
Strickland, J. D. and Parsons, T. R., (Eds.) 1972. A practical handbook of
seawater analysis. second edition. Fisheries Research Board of Canada, Ottawah

Sampling Description.

None

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
SortChem_# A unique number assigned to each sample collected at a specific site at a specific date and time. The year that the sample was collected is followed by a dash and then a sequential number. For example, if 600 samples were collected in 2002, then the first sample collected is 2002-0001 and the last sample is 2002-0600. text        
Site Site Name: Name of the lake where measurements were taken. There are discrete sampling sites defined by water depth, generally they are at the point of maximum depth. text        
Date Date readings were taken on. datetime   dd-mmm-yyyy    
Dep_m Depth of water sample taken at starting from the surface as 0. number meter     .=Missing or Not Measured
Chl_ug/l Pheaophytin corrected chlorophyll a concentration from fluorometric analysis of chlorophyll extracted in acetone from 47mm GFF fiter number microgramPerLiter     .=Missing or Not Measured
Pheo_ug/l Pheaophytin concentrations from fluorometric analysis of chlorophyll extracted in acetone from 47mm GFF fiter number microgramPerLiter     .=Missing or Not Measured
NH4OPA_uM Ammonium concentrations from OPA fluorometric analysis number micromolePerLiter     .=Missing or Not Measured
PO4_uM phosphate concentrations from colormetric analysis number micromolePerLiter     .=Missing or Not Measured
NO3_uM nitrate+nitrite concentrations from colormetric analysis number micromolePerLiter     .=Missing or Not Measured
TDN_uM Total dissolved nitrogen number micromolePerLiter     .=Missing or Not Measured
TN_uM Total nitrogen. This value is the sum of TDN and particulate nitrogen number micromolePerLiter     .=Missing or Not Measured
TP_uM Total phosphorus. This value is the sum of TDP and particulate phosphorus number micromolePerLiter     .=Missing or Not Measured
TDP_uM Total dissolved phosphorus number micromolePerLiter     .=Missing or Not Measured
PP-ug/l Particulate phosphorus number microgramPerLiter     .=Missing or Not Measured
PP_uM Particulate phosphorus number micromolePerLiter     .=Missing or Not Measured
PN-ug/l Particulate nitrogen number microgramPerLiter     .=Missing or Not Measured
PN_uM Particulate nitrogen number micromolePerLiter     .=Missing or Not Measured
PC-ug/l Particulate carbon number microgramPerLiter     .=Missing or Not Measured
PC_uM Particulate carbon number micromolePerLiter     .=Missing or Not Measured
Bact_cells/ml Bacteria counts from flow cytometer cells/ml number numberPerMilliliter     .=Missing or Not Measured
UncorChl_ug/l Uncorrected chlorophyll a number microgramPerLiter     .=Missing or Not Measured
Cl_uM Dissolved chloride concentration number micromolePerLiter     .=Missing or Not Measured
SO4_uM Dissolved sulfate concentration number micromolePerLiter     .=Missing or Not Measured
Notes Any additional information pertaining to measurments made for a particular depth, place and time. text       .=Missing or Not Measured
NH4 Indol_uM Ammonium concentrations from Phenol/ Indol method number micromolePerLiter     .=Missing or Not Measured

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