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PRINCIPAL INVESTIGATOR: KEYWORDS: lake, limnology, nutrient, ammonia, nitrate, nitrite, soluble reactive phosphorus,
phosphorus, Antarctica
ABSTRACT: An important part of the McMurdo Long Term Ecological Research
(LTER) project is identifying patterns and movements of nutrients in perennial
ice-covered lakes. This data set addresses this core area of research and quantifies
macronutrient concentrations found at specific depths in McMurdo Dry Valley lakes.
VARIABLES: limno run, location name, location code, date, depth (m),
NH4 (然), NH4(MCM) (然), NH4 comments, SRP (然), SRP(MCM) (然), SRP comments,
NO2 (然), NO2(MCM) (然), NO2 comments, NO3 (然),
NO3(MCM) (然), NO3 comments, file name
RESEARCH LOCATION: Samples were collected from the East Lake Bonney, West Lake Bonney, Lake Hoare,
Lake Fryxell, Lake Joyce and Lake Miers 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蚓 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蚓 until analysis by ASA
Analytical Services. The filter was used for chlorophyll-a analysis. The ASA
analytical chemist performed the nutrient assays with a Lachat Quickchem AE
Autoanalyzer using standard methods. Soluble Reactive Phosphorus was determined
manually in a 10 cm cell using an ammonium molybdate method.
TIMING: Samples were collected from the following sites and dates: CITATIONS:
COMMENTS:
Soluble Reactive Phosphorus analyses were not performed on samples
collected during the following limno runs:
West Lake Bonney:
Lake Hoare:
Lake Fryxell:
Lake Vanda:
Lake Joyce:
Lake Miers:
Lake Trough:
Method detection limits for each analysis are as follows:
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 NH4 (然) Number Ammonia concentration found using Lachat 然 Null 0 2000 0.1 NH4(MCM) (然) Number Ammonia concentration found using manual methods 然 Null 0 500 0.1 NH4 Comments Text Helpful hints about the NH4 sample Null n/a n/a n/a SRP (然) Number Soluble reactive phosphorus found using Lachat 然 Null 0 100 0.01 SRP(MCM) (然) Number Soluble reactive phosphorus found using manual methods 然 Null 0 2 0.01 SRP Comments Text Helpful hints about the SRP sample Null n/a n/a n/a NO2 (然) Number Nitrite concentration found using Lachat 然 Null 0 100 0.01 NO2(MCM) (然) Number Nitrite concentration found using manual methods 然 Null 0 100 0.01 NO2 Comments Text Helpful hints about the NO2 sample Null n/a n/a n/a NO3 (然) Number Nitrate concentration found using Lachat 然 Null 0 500 0.01 NO3(MCM) (然) Number Nitrate concentration found using manual methods 然 Null 0 300 0.01 NO3 Comments Text Helpful hints about the NO3 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 Metanut9697.rtf and Metanut9798.rtf files. The
files were called up using Microsoft Word version 6.0. Text from these files 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 Joyce Miers 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
6-Oct-1995 4-Oct-1995 14-Sep-1995 28-Sep-1995
17-Oct-1995 19-Oct-1995 25-Sep-1995 14-Oct-1995
2-Dec-1995 5-Dec-1995 10-Oct-1995 26-Nov-1995
1-Jan-1996 4-Jan-1996 21-Nov-1995 27-Dec-1995
23-Dec-1995
1996-1997 3-Nov-1996 1-Nov-1996 8-Nov-1996 26-Oct-1996 5-Dec-1996 10-Dec-1996
24-Nov-1996 26-Nov-1996 2-Dec-1996 19-Nov-1996
15-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
1-Dec-1997
2-Dec-1997 3-Dec-1997 12-Dec-1997 16-Dec-1997 9-Dec-1997 5-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 28-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
East Lake Bonney (EB9697L2)..........24-Nov-1996
East Lake Bonney (EB9697L3)..........15-Jan-1997
West Lake Bonney (WB9697L2)..........26-Nov-1996
Samples of high salinity are diluted with deionized water to 35 ppt or lower:
East Lake Bonney:
Ammonia ............................ 0.15 然
Soluble Reactive Phosphorus......... 0.02 然
Nitrate ............................ 0.50 然
Nitrite ............................ 0.10 然
none
none
none
none
none