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PRINCIPAL INVESTIGATOR: KEYWORDS: lake, limnology, dissolved inorganic carbon, DIC, Antarctica
ABSTRACT: The McMurdo Long Term Ecological Research (LTER) project
monitors patterns of inorganic material transport in perennial ice-capped lakes.
This data set addresses this core area of research and quantifies dissolved inorganic
carbon concentrations at specific depths in McMurdo Dry Valley lakes. Dissolved
inorganic carbon is also necessary for the computation of primary productivity.
VARIABLES: limno run, location name, location code, date, depth (m),
DIC (mg C L-1), DIC (mM), DIC 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. Dissolved
inorganic carbon samples were decanted directly from the Niskin bottle into a 30 mL
serum vial. Lake water was allowed to overflow from the serum vial and completely
displace the initial sample volume. The sample was preserved with 0.15 mL chloroform,
capped with a rubber stopper and crimped with an aluminum cap. Samples were stored in
the dark at 4°C until analysis. Analyses were performed with either a MSA Lira
infrared gas analyzer with a HP Integrator or a Licor 6252 CO2 analyzer, depending on the
analysis location (i.e. field lab or McMurdo), following N2 sparging in 6 N H2S04.
The Licor instrument automatically calculates integrated peak areas. A DIC standard
(60 mg C L-1) was prepared and incremental samples were injected (0.1, 0.3, 0.5, 0.7,
0.9 mL) into the sparging chamber and analyzed by the IRGA. The slope of the peak
areas was used to calculate the dissolved inorganic carbon concentrations of the lake
water sample.
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 DIC (mg C/l) Number Dissolved inorganic carbon concentration found at lake depth mg of carbon / liter Null 0 3000 0.1 DIC (mM) Number Dissolved inorganic carbon concentration found at lake depth mM of carbon Null 0 500 0.1 DIC Comments Text Helpful hints about the DIC 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: Data from this table was submitted to INSTAAR by John Priscu's team at
Montana State University. The raw data files listed under 'file name' are the names of the
original files submitted. The 1993/94 and 1994/95 datasets are Microsoft Excel version 6.0
files, and the 1995/96, 1996/97 and 1997/98 datasets are ascii text files.
Upon arrival at INSTAAR, the data manager fine-tuned the location codes and limno runs to
match those provided in the "locations, dates, codes for lake chemistry, biology samples"
file. The file was imported into Microsoft Access on INSTAAR's Unix system,
and can currently be found there. The file was then exported in ascii, comma delimited
text and MS-DOS text (table layout) to present on the MCM LTER web site. Both of these files are
linked to this web page above.
Information for the metadata was obtained from the Metadic9697.rtf file. The file
was called up using Microsoft Word version 6.0. Text from this file was used to create
this page in html format.
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 Trough
1993-1994 27-Oct-1993 29-Oct-1993 6-Nov-1993 16-Nov-1993
10-Nov-1993 12-Nov-1993 1-Dec-1993 7-Dec-1993
24-Nov-1993 26-Nov-1993 30-Dec-1993 7-Jan-1994
7-Dec-1993 9-Dec-1993 19-Jan-1994 18-Jan-1994
21-Dec-1993 23-Dec-1993
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
1995-1996 19-Sep-1995 21-Sep-1995 7-Sep-1995 14-Sep-1995
14-Sep-1995
6-Oct-1995 4-Oct-1995 25-Sep-1995 28-Sep-1995
17-Oct-1995 19-Oct-1995 10-Oct-1995 14-Oct-1995
2-Dec-1995 5-Dec-1995 21-Nov-1995 26-Nov-1995
1-Jan-1996 4-Jan-1996 23-Dec-1995 27-Dec-1995
1996-1997 3-Nov-1996 1-Nov-1996 8-Nov-1996 26-Oct-1996
24-Nov-1996 26-Nov-1996 2-Dec-1996 19-Nov-1996
1-Jan-1997 17-Jan-1997 12-Jan-1997 9-Jan-1997
1997-1998 8-Nov-1997 11-Nov-1997 15-Nov-1997 18-Nov-1997
12-Dec-1997 16-Dec-1997
20-Dec-1997 22-Dec-1997 26-Dec-1997 29-Dec-1997
1998-1999 9-Nov-1998 11-Nov-1998 3-Nov-1998 28-Oct-1998
6-Dec-1998 9-Dec-1998 1-Dec-1998 23-Nov-1998
30-Dec-1998 1-Jan-1999 26-Dec-1998 20-Dec-1998 23-Dec-1998
1999-2000 6-Nov-1999 11-Nov-1999 17-Nov-1999 30-Oct-1999
3-Dec-1999 5-Dec-1999 12-Dec-1999 27-Nov-1999
28-Dec-1999 30-Dec-1999 4-Jan-2000 23-Dec-1999
none
none