Lake Biology

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


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

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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.


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.


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