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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 

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.


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:2006_ArcticLTER_Lakes_physchem.04
Dataset Title:Physical and chemical data for various lakes near Toolik Research Station, Arctic LTER Summer 2006.
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
Zip Code:02543
Country:United States of America
Investigator 2: 
First Name:Christopher
Last Name:Luecke
Organization:Utah State University
Address line 2:Department of Watershed Science
Address line 3:
Zip Code:84322-5210
Country:United States of America
Investigator 3: 
First Name:George
Last Name:Kling
Organization:University of Michigan
Address line 2:Department of Ecology and Evolutionary Biology
City:Ann Arbor
Zip Code:48109-1048
Country:United States of America
Investigator 4: 
First Name:Chris
Last Name:Crockett
Address line 2:
Address line 3:
Zip Code:
Associate Investigators:
Keywords:chemistry, depth, pH, conductivity, temperature, photosynthetically active radiation, light, dissolved oxygen, chlorophyll, chlorophyll a, aquatic ecosystems, arctic, freshwater, irradiance, lakes, limnology, oxygen, specific conductivity, inorganic nutrients, arctic lakes
Abstract:Yearly file describing the physical/chemical values recorded at various lakes near Toolik Research Station. Sample site descriptors include site, date, time, depth. Depth profiles of physical measures collected in situwith Hydrolab Datasonde in the field include temperature, conductivity, pH, dissolved oxygen in both percent saturation and mg/l, SCUFA chlorophyll-a values in both volts and g/l, and PAR.
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
Online URL:
Data File URL
Data File Name 2006_ArcticLTER_Lakes_physchem.3
Beginning Date 6/13/2006
End Date 8/30/2006
Number of Data Records 1125
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: Entered metadata into new metadata form.
Version 2: Extra columns added to mirror setup of files from earlier years. CH 14Feb13
Version 3: Updated metadata form to newer version with site sheet. CH March 2013.
Version 4: 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 05 E 06 I1 I2 I3 I4 I5 I6 I6 headwater lake I7 I8 I swamp N 01 N 02 S 06 S 07 NE 9B Fog lake 2 Fog lake 4 Green Cabin Lake Toolik Inlet  
Geographic Description Toolik Lake, Main Station Lake E1 Lake E5 Lake E6 Lake I1 Lake I2 Lake I3 Lake I4 Lake I5 Lake I6 Lake I6 Headwaters Lake I7 Lake I8 Lake ISwamp Lake N1 Lake N2 Lake S6 Lake S7 Lake NE9B Fog 2 Fog 4 Green Cabin Lake Toolik Lake inlet  
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 68.642611 68.6434270583 68.5687130789 68.5713195633 68.5755366301 68.57956715 68.5873874391 68.5965924039 68.582062 68.6008747982 68.6101575207 68.610781 68.6398939358 68.6409472345 68.6293797816 68.6300627447 68.6526454831 68.6833333333333 68.68 68.53698 68.6256  
Longitude -149.612633 -149.555347706 -149.458079 -149.440564592 -149.58807625 -149.565881618 -149.583644456 -149.58405938 -149.589625877 -149.59264335 -149.622932 -149.596582063 -149.582211513 -149.600742 -149.606965643 -149.625086307 -149.641623295 -149.644441789 -149.599473662 -149.1 -149.071666666667 -149.2374 -149.59605  
Elevation 719 762 800 792 785 785 774 770 767 754 806 742 744 736 731 724 731 731 747 785 754 883 719  
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  
Organisms studied
Methods:For field work and sampling protocols see "Sampling and Field Methods Protocol" on The Arctic LTER webpage ( specific link found below.

All measurements were taken with a DS5 Hydrolab Datasonde. Depth reading on sonde was calibrated in the field so that a depth of 0m was the water surface. For profiles, measurements were taken at surface (~0m), at ~0.5m depth, at ~1m of depth, then at 1m intervals until bottom. Measurements were recorded on a Surveyor 4a datalogger and also recorded in a field book. Values recovered from the Surveyor 4a datalogger were used except where values were either missing or highly suspect, in which case values from the fieldbook were used and noted under the "Notes" column.

This file was created from a working file titled "2006AKLakes". History of the file is listed below:

Date User Changes/Corrections
9-Oct-07 Imported Anion sample data run by Rich M. into Nutrient file
9-Oct-07 Imported NH4 data into Nutrient file
10-Oct-07 Imported PO4 data into Nutrient file
10-Oct-07 Imported NO3 data run by Rich M. into Nutrient file
19-Oct-07 Imported PP data into Nutrient file

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
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    
Time_hr_dst Exact time that each reading was recorded in Alaska Daylight Savings Time (1 hour ahead of Alaska Standard Time: if 13:00 DST than 12:00 AST) datetime   hh:mm:ss   .=Missing or Not Measured
IBVSvr4a_V Internal Battery Voltage of the Surveyor 4a Datalogger. number volt     .=Missing or Not Measured
Temp_C Water temperature at depth. number celsius     .=Missing or Not Measured
Cond_uS Electrical conductivity of the water at depth. number microsiemenPerCentimeter     .=Missing or Not Measured
Dep_m Depth of water measurement taken at starting from the surface as 0. number meter     .=Missing or Not Measured
pH pH (opposite of the log of the hydrogen ion concentration). number dimensionless     .=Missing or Not Measured
DO_Sat The percent saturation of dissolved oxygen at depth. number percent     .=Missing or Not Measured
DO_mg/l The concentration of dissolved oxygen at depth. number milligramPerLiter     .=Missing or Not Measured
Chl_V In Vivo measurement of chlorophyll-a concentration. number volt     .=Missing or Not Measured
Chl_ug/l In Vivo measurement of chlorophyll-a concentration. number microgramPerLiter     .=Missing or Not Measured
PAR_uEm2s PAR (photosynthetically active radiation) measured below the water surface. number microEinsteinPerMeterSquaredPerSecond     .=Missing or Not Measured
refPAR_uEm2s PAR (photosynthetically active radiation) measured with Deck unit to correct for changes in ambient light. number microEinsteinPerMeterSquaredPerSecond     .=Missing or Not Measured
Secchi_m Measure of water transparency by depth a Secchi Disk is visible to. number meter     .=Missing or Not Measured
Hydrolab This field indicates which Hydrolab Datasonde instrument was used to take measurements text        
Notes Any additional information pertaining to measurments made for a particular depth, place and time. text       .=Missing or Not Measured

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