| Data Tables, Images, and Other Entities: |
| Data Table: | Units_And_Column_Descriptions
View Table Metadata |
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Short Name: | limndoc.dat |
| Online Distribution Info: |
| Download File: |
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| Data Set Owner(s): |
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Individual: | John Priscu |
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Address: |
| Department of Land Resources and Environmental Sciences, |
| 334 Leon Johnson Hall, |
| Montana State University, |
| Bozeman, MT 59717 USA |
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Email Address:
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| Metadata Provider(s): |
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Organization: | McMurdo Dry Valleys LTER |
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Address: |
| Byrd Polar Research Center, |
| 108 Scott Hall, |
| 1090 Carmack Rd, |
| Columbus, OH 43210-1002 USA |
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Phone:
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Email Address:
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| Abstract: |
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The McMurdo Long Term Ecological Research (LTER) project monitors patterns of
organic material transport in perennial ice-capped lakes. This data set addresses this core
area of research and quantifies dissolved organic carbon concentrations at specific depths in
McMurdo Dry Valley lakes.
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| Keywords: |
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- lake
(theme)
- limnology
(theme)
- dissolved organic carbon
(theme)
- DOC
(theme)
- Antarctica
(theme)
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| Additional Information: |
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| Citations |
| Notes |
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 corrected or qualified.
Thus, these data may be modified and future data will be appended.
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| License and Usage Rights: |
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| MCM LTER data may be used freely with the following restrictions: |
The Principal Investigator be sent a notice stating reasons for acquiring any
data and a description of the publication intentions.The Principal Investigator of the data set be sent a copy of the report or
manuscript prior to submission and be adequately cited in any resultant
publications.A copy of any resultant publications should be sent to the McMurdo data
manager and principal investigator.The end-user follow the guidelines set forth in the LTER Network Data Access
Policy, Data Access Requirements, and General Data Use Agreement found at
http://www.mcmlter.org/data_guidelines.htm
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| Geographic Coverage: |
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Geographic Description: | 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, as well as from Pony Lake on Ross Island. |
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Bounding Coordinates:
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| West: | 162 degrees
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| East: | 163.6 degrees
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| North: | -77.2 degrees
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| South: | -77.8 degrees
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Mimimum Altitude: | 0 meter |
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Maximum Altitude: | 1000 meter |
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| Temporal Coverage: |
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Begin:
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End:
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| Maintenance: |
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Description:
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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 data is a Microsoft Excel version 6.0 file, and the 1996/97 and
1997/98 data 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 MetaDOC9697.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. While processing the 1997-98
data, the data manager noticed that the values provided for dissolved organic carbon (DOC)
from Lake Fryxell in the 1996-97 season did not have the appropriate conversion done between
DOC (mg/L) and DOC (mM). The mM number should equal the mg/L value divided by 12, but in this
case it was divisible by 2. Craig Wolf was contacted to look into this in November 1999, but
since it was the middle of the field season, it took some time to resolve it. On 28-Feb-2000,
the 1996-97 DOC (mM) values for Lake Fryxell were updated to the DOC (mg/L) values divided by
12 (rather than DOC (mg/L) divided by 2).
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Frequency:
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| Contact: |
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Organization: | McMurdo Dry Valleys LTER |
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Position: | Data Manager |
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Address: |
| Byrd Polar Research Center, |
| 108 Scott Hall, |
| 1090 Carmack Rd, |
| Columbus, OH 43210-1002 USA |
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Phone:
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Email Address:
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| Publisher: |
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Organization: | McMurdo Dry Valleys LTER |
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Address: |
| Byrd Polar Research Center, |
| 108 Scott Hall, |
| 1090 Carmack Rd, |
| Columbus, |
| Columbus, OH 43210-1002 USA |
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Phone:
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| Methods Info: |
| Step 1: |
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Description:
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| Lake water samples are collected at specific depths with a five-liter Niskin bottle during normal LTER limnological sampling. Sub-samples for DOC analysis are decanted into a 1 L amber Nalgene bottle. One-100 mL sub-sample is taken from the one-liter amber Nalgene bottle. The sample is filtered through a combusted (475 °C for 4 hours) Whatman 25 mm GF/F using a bell jar apparatus. The filtrate is collected in a 100 mL acid washed, combusted amber bottle (475 °C for 4 hours) and preserved with 1 mL of 6N hydrochloric acid (HCL). The sample is stored at 4 °C until analysis with the Shimadzu 5000 TOC analyzer by RPSC Analytical Services. The filter is used for chlorophyll-a analysis. |
| Manual Dilutions for Shimadzu 5000 TOC analyzer (unless otherwise noted in data file):
East Lake Bonney: 4.5-12m=no dilution; 13-20m=dilute 1 in 12 (sample:DIW); 22-37m=1 in 24
West Lake Bonney: 4.5-12m=no dilution; 13-38=dilute 1 in 12 (sample:DIW)
Lake Fryxell: 4.5-18m=no dilution
Lake Hoare: 4.5-30m=no dilution
Lake Vanda: 4.5-64m=no dilution; 68-75=dilute 1 in 12 (sample:DIW) |
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