Acceptance and utilization of LTER data requires that:
FILE NAME: PRINCIPAL INVESTIGATOR: OTHERS: KEYWORDS: lake, limnology, chemistry, Winkler, Antarctica
ABSTRACT: As part of the McMurdo Long Term Ecological Research
(LTER) project, Winkler values were quantified at specific depths in McMurdo Dry Valley lakes.
VARIABLES: limno run, location name, location code, date, depth (m),
Winkler (mg L-1), Winkler comments, file name
RESEARCH LOCATION: Samples were collected from the East Lake Bonney, West Lake Bonney, Lake Hoare,
and Lake Fryxell limnological sampling stations, located in the McMurdo Dry Valleys of Antarctica. Descriptions
of these lakes can be found in the McMurdo Dry Valley Lake
Descriptions file.
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°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°C until analysis.
TIMING: Samples were collected from the following sites and dates: CITATIONS:
COMMENTS:
STATUS: Public Access (Type 1).
VARIABLE DESCRIPTION:
VARIABLE TYPE DESCRIPTION UNITS MISSING VALUE INDICATOR MINIMUM MAXIMUM PRECISION Limno Run Text Code for lake's sampling location and date none Required entry n/a n/a n/a Location Name Text Name of lake where measurement was made none Required entry n/a n/a n/a Location Code Text Code for site where measurement was made none Required entry n/a n/a n/a Date Date Date on which sample was gathered mm/dd/yy Required entry 01/01/93 12/31/99 dd Depth (m) Number Distance below ice from which sample was drawn meters Required entry 1 45 1 Winkler (mg l-1) Number Winkler value found for sample milligrams per liter Null 0 100 0.1 Winkler Comments Text Helpful hints about the Winkler sample Null n/a n/a n/a File Name Text Name of file in which data was submitted Null n/a n/a n/a LOG: 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. These files are currently
located in the /data1/data/lakes/lakechem directory and contain the following names:
In December, 1998, the data manager was re-organizing the liminological data sets &
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.
NOTE: Data contained in these files has been subjected to quality
control standards imposed by the investigator. The user of this data
should be aware that, while efforts have been taken to ensure that these
data are of the highest quality, there is no guarantee of perfection
for the data contained herein and the possibility of errors exists. If
you encounter questionable data, please contact the MCM LTER data manager
(; (303)492-4639) so that the data can be
corrected or qualified. Thus, these data may be modified and future
data will be appended.
Season East Bonney West Bonney Hoare Fryxell
1994-1995 2-Nov-1994 5-Nov-1994 10-Nov-1994 14-Nov-1994
23-Nov-1994 25-Nov-1994 30-Nov-1994 4-Dec-1994
17-Dec-1994 19-Dec-1994 24-Dec-1994 30-Dec-1994
10-Jan-1995 12-Jan-1995 20-Jan-1995 17-Jan-1995
none
none
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.