Lakes Dissolved Oxygen (Winkler Values), 1994/95 season

Summary

Abstract: 

As part of the McMurdo Long Term Ecological Research (LTER) project, Winkler values were quantified at specific depths in McMurdo Dry Valley lakes during the 1994/95 season

Date Range: 

Wednesday, November 2, 1994 to Thursday, January 12, 1995
Download winkler.csv (14.09 KB)

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Variables: 

Limno Run
  • Label:
  • Definition: Code for lake's sampling location and date
  • Type: Nominal
  • Missing values: None specified
Location Name
  • Label:
  • Definition: Name of lake where measurement was made
  • Type: Nominal
  • Missing values: None specified
Location Code
  • Label:
  • Definition: Code for site where measurement was made
  • Type: Nominal
  • Missing values: None specified
DATE_TIME
  • Label: Date
  • Definition: Date on which sample was gathered
  • Type: Date/time
  • Date format: mm/dd/yyyy
  • Missing values: None specified
Depth (m)
  • Label:
  • Definition: Distance below ice from which sample was drawn
  • Type: Physical quantity
  • Unit: meter
  • Maximum: 45
  • Minimum: 1
  • Precision: 1
  • Missing values:
    • Required entry = None given
WINKLER (mg/L)
  • Label: Winkler (mg/L)
  • Definition: Winkler value found for sample
  • Type: Physical quantity
  • Unit: milligramsPerLiter
  • Maximum: 100
  • Minimum: 0
  • Precision: 0.1
  • Missing values:
    • Null = None given
WINKLER COMMENTS
  • Label: Winkler Comments
  • Definition: Helpful hints about the Winkler sample
  • Type: Nominal
  • Missing values: None specified
File Name
  • Label:
  • Definition: Name of file in which data was submitted
  • Type: Nominal
  • Missing values: None specified

DOI: 

10.6073/pasta/3955383e13dbf26dab568a1e7254b179

Short name: 

winkler

Data set ID: 

65
People

Owner/Creator: 

W. Berry Lyons

Contact: 

McMurdo Dry Valleys LTER

Additional Project roles: 

Data Manager
Chris Gardner
Data Manager
Inigo San Gil
Related
Methodology

Methods: 

Lake water samples were collected at specific depths with a five-liter Niskin bottle during normal LTER limnological sampling. Sub-samples were decanted into three-1 L Nalgene bottles (2-light and 1-amber), two-500 mL amber Nalgene bottles, three-150 mL borosilicate glass bottles, two-20 mL scintillation vials, and one-30 mL serum vial. One-100 mL sub-sample was taken from the one-liter amber Nalgene bottle. The sample was filtered through a combusted (475 degrees C for 4 hours) Whatman 25 mm GF/F filter using a bell jar apparatus. The filtrate was collected in a 125 mL acid washed Nalgene bottle and stored at -20 degrees C until analysis.

Maintenance: 

Metadata enhanced in 2016, San Gil
 
 The original iterations of this data was created by Rob Edwards and submitted to the Institute of Arctic and Alpine Research (INSTAAR) in the summer of 1997. 
       
 The Winkler data from these files was imported into Microsoft Access and included in a table named "Limnological Nutrients". This table was exported as an ascii, text, comma delimited file named "limnchem.dat" and saved in the appropriate directory to make it accessible on the web page. 
       
 In December, 1998, the data manager was re-organizing the limnological data sets and decided to separate the limnological nutrients table into smaller parts. The Winkler data was therefore saved in a different table in Access, and represented in a separate file from the limnological nutrients data on the web. The resulting files for the Winkler data are linked to this web page above.
 
Metadata Download
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Categories

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Keywords: