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)

...or query the data clicking the:

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:

People

Owner/Creator:

W. Berry Lyons

Contact:

McMurdo Dry Valleys LTER

Additional Project roles:

Data Manager

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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