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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:2001_ArcticLTER_lakes_chl.02
Dataset Title:Total chlorophyll a and primary productivity data for Toolik Lake and surrounding lakes near the Arctic LTER site during the summer of 2001.
Investigator 1: 
First Name:Anne
Last Name:Giblin
Organization:Marine Biological Laboratory
Address line 2:The Ecosystems Center
Address line 3:7 MBL Street
City:Woods Hole
State:MA
Zip Code:02543
Country:USA
Investigator 2: 
First Name:Chris
Last Name:Crockett
Organization:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Investigator 3: 
First Name:Neil
Last Name:Bettez
Investigator 4: 
First Name:Shelley
Last Name:Schmidt
Associate Investigators:
Keywords:chlorophyll a, pheophytin, primary productivity, arctic lakes, lakes
Abstract:

Total chlorophyll a and primary productivitydata for Toolik Lake and surrounding lakes near the Arctic LTER site during the summer of 2001.
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.10220&urlTail=lakes/chlor/data/2001_ArcticLTER_lakes_chl.csv
Data File Name 2001_ArcticLTER_lakes_chl.xls
Beginning Date 5/1/2001
End Date 9/1/2001
Number of Data Records 254
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: Log of changes: 1. A Turner 111 fluorometer was used from 1975-1991. 2. A Turner 450 Fluorometer using a NB 440 filter was used starting in 1992- 1994. 3. A Turner 450 Fluorometer using a NB 430 filter was used starting in 1995 until 1998. 4. Starting in 1998 a Turner Designs 10-Au -005 -CE configured with a chlorophyll optical kit: photomultiplier tube 185 - 870; lamp daylight white, F25T5, 400-600 nm; excitation filter 340-500 nm round bandpass 5-60; emission filter >665 nm round sharpcut 2-64; reference filter 400-700 nm square 1 ND,was used to measure chlorophyll. For Archival Use: DATE RECEIVED: October 2001 DATA FILE ENTERED BY: Neil Bettez DATA FILE VALIDATION: NAME: Neil Bettez DATE: October 2001
Version 1: Metadata updated to newer version (with sites sheet). Data from individual lakes compiled into one spreadsheet for summer 2001 called "2001_ArcticLTER_lakes_chl". Data columns reordered to match other years. CH 3 Apr 2013.
Version 2: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 15Jan14
 
RESEARCH LOCATION:                                                                            
Location Name Toolik Campsite Lake E 01 E 05 E 06 Elusive Lake Fog lake 2 Fog lake 4 Galbraith Lake I swamp I1 I2 I3 I4 I5 I6 I6 headwater lake I7 I8 Island Lake Itigaknit lake Itkillik lake Lake Anne Lake Charles Lake George N 01 NE 12 NE 14 NE 9B O1 O2 O3 S 11 S 12 S 13 S 06 S 07  
Geographic Description Toolik Field Station, North Slope, Alaska. Campsite Lake Lake E1 Lake E5 Lake E6 On accomplishment Creek Fog 2 Fog 4 Galbraith Lake I swamp I1 I2 I3 I4 I5 I6 I6 headwater lake I7 I8 Island Lake Itigaknit lake Itkillik lake Lake Anne Lake Charles Lake George Lake N1 Lake NE12 Lake NE14 Lake NE9B O1, these are lakes near Campsite Lake O2, these are lakes near Campsite Lake O3, these are lakes near Campsite Lake Lake S11 Lak S12 Lake S13 Lake S6 Lake S7  
Location Bounding Box                                                                            
West Bounding Coordinate                                                                            
East Bounding Coordinate                                                                            
North Bounding Coordinate                                                                            
South Bounding Coordinate                                                                            
OR if single point location                                                                            
Latitude 68.629961 68.6 68.6261956028 68.642611 68.6434270583 68.65 68.6833333333333 68.68 68.4666666666667 68.610781 68.5687130789 68.5713195633 68.5755366301 68.57956715 68.5873874391 68.5965924039 68.582062 68.6008747982 68.6101575207 68.52364 68.68738 68.3833333333333 68.7333333333333 69.0333333333333 68.7333333333333 68.6398939358 68.65 68.6833333333333 68.6526454831 68.6 68.5833333333333 68.6 68.630148049 68.6296278029 68.6314865687 68.6293797816 68.6300627447  
Longitude -149.612633 -149.183333333333 -149.555347706 -149.458079 -149.440564592 -148.5 -149.1 -149.071666666667 -149.5 -149.600742 -149.58807625 -149.565881618 -149.583644456 -149.58405938 -149.589625877 -149.59264335 -149.622932 -149.596582063 -149.582211513 -149.48141 -149.67459 -149.916666666667 -148.933333333333 -148.85 -148.966666666667 -149.606965643 -149.616666666667 -149.616666666667 -149.599473662 -149.183333333333 -149.2 -149.166666666667 -149.650579145 -149.655880887 -149.659102317 -149.641623295 -149.644441789  
Elevation 719 864 762 800 792 525 785 754 802 736 785 785 774 770 767 754 806 742 744 881 747 681 556 319 597 731 699 701 747 876 892 876 750 754 754 731 731  
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  
                                                                             
 
TAXONOMIC COVERAGE:
Organisms studied
 
Methods:Water samples were collected at 0, 1, 3, 5, 8, 12, and 16-meter depths in the monitoring lakes and 0 meters in the survey lakes. The water was filtered in the field though a Millipore 47 mm filter cassette (SX0004700)containing a Whatman GF/C glass fiber. This filter was then returned to the lab where it was placed in 10 ml of buffered 90% acetone (1 mg/l MgCO-3), and extracted in the
dark, at room temperature for 24 hours. The amount of chlorophyll a was determined using a Turner Designs 10-Au -005 -CE configured with a chlorophyll optical kit (10-037R). This kit is used for the
traditional in-vivo measurement of chlorophyll (Lorenzen) and in-vivo /extractive acidification methods, including Strickland and parsons, standard methods for water and waste water and EPA 445.

Notes: The Turner Designs 10-Au -005 -CE fluorometer was calibrated using two chlorophyll a standards of known concentrations obtained from Turner Designs. Each time samples were run the Turner Designs 10-AU fluorometer solid standard was also run.

Reference Citations: R.G. Wetzel & G.E. Likens. 1979. Limnological Methods. Saunders.
Philadelphia.

Sampling Description.

None

C E, C = Chlorophyll a concentration in the extract (usually 10ml)
C E, C = Fs(r/r-1)(Rb-Ra)
Where...
C E, C = corrected chlorophyll a concentration (ug/L) in the extract solution analyzed
Fs = response factor for the sensitivity setting S
r = the before to after acidification ration of a pure chl a solution (Rb/Ra)
Rb = fluorescence of sample extract before acidification
Ra = fluorescence of sample extract after acidification
C S, C = corrected chl a concentration (ug/L) in the whole water sample
C S, C ={(C E, C x extract volume in L x Dilution Factor)/(sample volume in L)
Pheophytin a
PE = pheophytin a concentration (ug/L) in the sample extract
PE = Fs (r/r-1) (rRa - Rb)
PS = pheophytin a concentration (ug/L) in the whole water sample
PS = (PE x extract volume in L x dilution factor)/(sample volume in L)
Note: if no dilution took place, then DF equals 1

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
Site Code site code text        
Lake Site of measurement text        
Depth (m) Depth number meter     .=Missing or Not Measured
Date Date datetime   DD-MMM-YY    
Julian Day Julian day number number     .=Missing or Not Measured
Corrected chl a (ug/L) Corrected Chlorophyll a, active chl a number microgramPerLiter     .=Missing or Not Measured
Pheo (ug/L) Pheophytin number microgramPerLiter     .=Missing or Not Measured
Total chl a (ug/L) Total chl a (uncorrected for pheophytin) number microgramPerLiter     .=Missing or Not Measured
PPROD (mgC/m3/d) Rate of primary production (mg availabe C/m3/d) number microgramPerLiterPerDay     .=Missing or Not Measured
Notes Notes text        

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