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Acceptance and utilization of LTER data requires that:

(1) The Principal Investigator be sent a notice stating reasons for acquiring any data and a description of the publication intentions.
(2) The Principal Investigator of the data set be sent a copy of the report or manuscript prior to submission and be adequately cited in any resultant publications.
(3) A copy of any resultant publications should be sent to:

Principal Investigator
Ecosystems Center
Marine Biological Laboratory
7 MBL St.
Woods Hole, MA 02543

Older Metadata: Attribute table not in XML (EML) file

Dataset URLs:METADATA: HTML, Rich Text, XML(EML compliant)
DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:2003n2chl
Dataset Title:Total Chlorophyll a for lake N2 during the summer of 2003 , Arctic LTER 2003.
Investigator 1: 
First Name:Anne
Last Name:Giblin
Address line 1:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Associate Investigators:Chris Crockett, Amanda Floyd
Keywords:
Abstract: Total Chlorophyll a for lake N2 during the summer of 2003
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 Name 2003n2chl
Beginning Date 5/1/2003
End Date 9/1/2003
Number of Data Records
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. 5. In 2002 and 2003 comparsions were made using both Whatman GFC filters (1.2um) and GFF filters (0.7um). Additional information about this comparison can be obtained by contacting the Arctic Lakes RA, C. Crockett. 6. In 2003 samples were acidified to determine pheophytin concentration. Data presented here represents raw chlorophyll, but post acidification values can be obtained by contacting the Arctic Lakes RA, C. Crockett. For Archival Use: DATE RECEIVED: November 2003 DATA FILE ENTERED BY: C. Crockett DATA FILE VALIDATION: NAME: 2003n2chl.txt DATE: October 2003
RESEARCH LOCATION:
Geographic Description Toolik Field Station, North Slope, Alaska.
Location Bounding Box
West Bounding Coordinate
East Bounding Coordinate
North Bounding Coordinate
South Bounding Coordinate
OR if single point location
Latitude
Longitude
TAXONOMIC COVERAGE:
Organisms studied
Methods:

Water samples are collected at 0, 1, 3, 5, and 6.5-meter depths in lake N2. Samples are collected in 2-L brown Nalgene bottles and returned to the lab within 2 hours. Water is filtered through a 47 mm Whatman GF/C (1.2um) glass fiber filter. Filters are placed in 10 ml of buffered 90% acetone (1 mg/l MgCO-3), and extracted in the dark, at room temperature for 24 hours. 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, and 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

Data Table

Variable		Variable descrip.		Precis. / Units	Coded	Missing
(Y/N)	Values
Site		site code					y	n
Lake		Site of measurement				n	n
DEPTH		Depth				meters		n	n
DATE		Date				DD-MMM-YY	n	n
Chlor a		Total Chlorophyll		ug/L		n	n
Notes		Notes				N/A		n	y
(12) CALCULATIONS
Variable					Formula
Total chlor a ug/L in sample = (ug ml acetone)*(ml Acetone/ml sample filtered)

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