uid=MCM,o=EDI,dc=edirepository,dc=org
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public
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limncn.dat
Particulate organic carbon (POC) and nitrogen (PON) concentrations in discrete water column samples collected from lakes in the McMurdo Dry Valleys, Antarctica (1993-2022, ongoing)
John
Priscu
jpriscu@montana.edu
https://orcid.org/0000-0001-5807-6364
McMurdo Dry Valleys LTER
http://mcmlter.org/
Jade
Lawrence
jlawrence1@unm.edu
field technician
Renée
Brown
rfbrown@unm.edu
https://orcid.org/0000-0002-4986-7663
data manager
Amy
Chiuchiolo
LRES, 334 Leon Johnson Hall
Bozeman
MT
59717
US
(406) 994-2360
(406) 994-5863
achiuchiolo@montana.edu
former field crew
Kathleen
Welch
kathleen.welch@colorado.edu
https://orcid.org/0000-0003-1028-3086
former lab crew
Denise
Steigerwald
former data manager
Chris
Gardner
gardner.177@osu.edu
https://orcid.org/0000-0003-0400-3754
former data manager
Inigo
San Gil
Department of Biology, MSC03 2020 University of New Mexico
Albuquerque
NM
87131
US
(505) 277-2625
(505) 277-2541
isangil@lternet.edu
former data manager
2022-06-30
English
An important part of the McMurdo Long Term Ecological Research (LTER) is evaluating carbon and nitrogen budgets in perennial ice-covered lakes. This dataset addresses this core area of research and quantifies the particulate organic carbon (POC) and nitrogen (PON) found at specific depths in lakes across the McMurdo Dry Valleys of Antarctica.
lakes
organic nitrogen
particulate organic carbon
particulates
LTER Controlled Vocabulary
Antarctica
carbon
lake
limnology
nitrogen
organic
particulate organic carbon
particulate organic nitrogen
Station Keywords
organic matter
LTER Core Areas
Funding for this work has been provided by several grants from the US National Science Foundation for Long Term Ecological Research, most recently under award #OPP-1637708.
Data Policies
This data package is released under the Creative Commons Attribution 4.0 International License (CC BY 4.0; http://creativecommons.org/licenses/by/4.0/), which allows consumers (hereinafter referred to as “Data Users”) to freely reuse, redistribute, transform, or build on this work (even commercially) so long as appropriate credit is provided. Accordingly, Data Users are required to properly cite this data package in any publications or in the metadata of any derived products that result from its use (in whole or in part). A recommended citation is provided on the summary metadata page associated with this data package in the McMurdo Dry Valleys LTER Data Catalog (https://mcmlter.org/data), and a generic citation may be found on the summary metadata page in the repository where this data package was obtained. When these data contribute significantly to the contents of a publication, Data Users must also acknowledge that data were provided by the NSF-supported McMurdo Dry Valleys Long Term Ecological Research program (OPP-1637708). This data package has been released in the spirit of open scientific collaboration. Hence, Data Users are strongly encouraged to consider consultation, collaboration, and/or co-authorship (as appropriate) with the data package creator(s). Data Users should be aware these data may be actively used by others for ongoing research; thus, coordination may be necessary to prevent duplicate publication. Data Users should also recognize that misinterpretation of data may occur if they are used outside the context of the original study. Hence, Data Users are urged to contact the data package creator(s) if they have any questions regarding methodology or results. While substantial efforts are made to ensure the accuracy of this data package (with all its components), complete accuracy cannot be guaranteed. Periodic updates to this data package may occur, and it is the responsibility of Data Users to check for new versions. This data package is made available “as is” and comes with no warranty of accuracy or fitness for use. The creator(s) of this data package and the repository where these data were obtained shall not be liable for any damages resulting from misinterpretation, use, or misuse of these data. Finally, as a professional courtesy, we kindly request Data Users notify the primary contact referenced in the metadata when these data are used in the production of any derivative work or publication. Notification should include an explanation of how the data were used, along with a digital copy of the derived product(s). Thank you.
https://mcm.lternet.edu/content/particulate-organic-carbon-poc-and-nitrogen-pon-concentrations-discrete-water-column-samples
Lake Bonney is a saline lake with permanent ice cover at the western end of Taylor Valley in the McMurdo Dry Valleys of Victoria Land, Antarctica. It is 7 kilometres or 4.3 mi long and up to 900 metres or 3,000 ft wide. A narrow channel only 50 metres or 160 ft wide. Lake Bonney at Narrows separates the lake into East Lake Bonney 3.32 square kilometres or 1.28 sq mi and West Lake Bonney, 0.99 square kilometres or 0.38 sq mi. The west lobe is flanked by Taylor glacier. Valley: Taylor Distance to Sea : 25 Maximum Length (km): 4.8 Maximum Width (km): 0.9 Maximum Depth (m): 37 Surface Area (km^2): 3.32 Ice Thickness Average Surface (m): 3 - 4.5 Volume (m^3 * 10^6): 54.7
162.353210449219
162.536209106445
-77.697700500488
-77.724441528320
57
57
meter
The Lake Fryxell basin is formed by a moraine depression in a wider portion of the Taylor Valley. It has a number of moraine islands and shallower areas, as well as several relatively well developed deltas. The lake is fed by at least 10 meltwater streams with a total drainage catchment of 230 km2. The lake is dammed to the southwest by the Canada Glacier and is topographically closed. It is perennially ice covered; during summer months, an ice-free moat generally forms around much of the lake margin. Lake levels have risen ~2 m between 1971 and 1996. There are no surface outflows; the only known water loss is through ice ablation (evaporation, sublimation and physical scouring). Valley: Taylor Distance to Sea : 9 Maximum Length (km): 5.8 Maximum Width (km): 2.1 Maximum Depth (m): 20 Surface Area (km^2): 7.08 Ice Thickness Average Surface (m): 3.3 - 4.5 Volume (m^3 * 10^6): 25.2
163.048782348633
163.259582519531
-77.597076416016
-77.622711181641
18
18
meter
Lake Hoare occupies a narrower portion of the Taylor Valley, dammed by the Canada Glacier. It would drain almost completely without this dam. There are a number of islands which may be related to an old terminal of Canada Glacier. The lake is fed primarily from direct runoff from the glacier, as well as meltwater streams. (Lake level rose ~1.5 m between 1972 and 1996). There are no surface outflows; the only known water loss is through ice ablation (evaporation, sublimation and physical scouring). Valley: Taylor Distance to Sea : 15 Maximum Length (km): 4.2 Maximum Width (km): 1 Maximum Depth (m): 34 Surface Area (km^2): 1.94 Ice Thickness Average Surface (m): 3.1 - 5.5 Volume (m^3 * 10^6): 17.5
162.784423828125
162.935836791992
-77.623085021973
-77.639259338379
73
73
meter
Lake Joyce lies in the Pearse Valley against the Taylor Glacier. Valley: Pearse Distance to Sea : 44 Maximum Length (km): 1 Maximum Width (km): 1 Maximum Depth (m): 35 Surface Area (km^2): 0.83 Ice Thickness Average Surface (m): 3.9 - 5.6 Volume (m^3 * 10^6): 4.9
161.608886718750
161.662445068359
-77.715972900391
-77.726486206055
301
301
meter
A lake with an area of 1 square mile which occupies the north portion of Pyramid Trough, Scott Coast. Named by New Zealand Geographic Board (NZGB) (1994) in association with Pyramid Trough.
162.718856811523
162.823226928711
-77.417655944824
-77.442016601563
Lake Miers lies in the Miers Valley. Valley: Miers Distance to Sea : 20 Maximum Length (km): 1.5 Maximum Width (km): 0.7 Maximum Depth (m): 21 Surface Area (km^2): 1.3 Ice Thickness Average Surface (m): 3.4 - 6 Volume (m^3 * 10^6): 2.9
163.812332153320
163.886840820313
-78.094047546387
-78.101478576660
240
240
meter
Lake Vanda is located in the Wright Valley, adjacent to the Taylor Valley. It is fed primarily by the Onyx River, which has its origin at Lake Brownworth, and ultimately at the Lower Wright Glacier located ~27 km east of the lake. The lake has no outflow. Valley: Wright Distance to Sea : 47 Maximum Length (km): 8 Maximum Width (km): 2 Maximum Depth (m): 75 Surface Area (km^2): 5.2 Ice Thickness Average Surface (m): 2.8 - 4.2 Volume (m^3 * 10^6): 160
161.391906738281
161.691970825195
-77.518882751465
-77.542304992676
143
143
meter
Lake Bonney is a saline lake with permanent ice cover at the western end of Taylor Valley in the McMurdo Dry Valleys of Victoria Land, Antarctica. It is 7 kilometres or 4.3 mi long and up to 900 metres or 3,000 ft wide. A narrow channel only 50 metres or 160 ft wide. Lake Bonney at Narrows separates the lake into East Lake Bonney 3.32 square kilometres or 1.28 sq mi and West Lake Bonney, 0.99 square kilometres or 0.38 sq mi. Valley: Taylor Distance to Sea : 28 Maximum Length (km): 2.6 Maximum Width (km): 0.9 Maximum Depth (m): 40 Surface Area (km^2): 0.99 Ice Thickness Average Surface (m): 2.8-4.5 Volume (m^3 * 10^6): 10.1
162.269104003906
162.354934692383
-77.714805603027
-77.727287292480
57
57
meter
1993-10-27
2022-01-08
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 Metachn9697.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. Data for the 2005-6 and 2006-7 season was updated in Oct 2009 Metadata was standardized to EML in 2006, and enhanced in 2014 using the Drupal Ecological Information Management System In 2020, issues regarding how filter blank corrections were applied to the particulate organic carbon data were identified. The errors applied to the carbon data from the 2003-04 through the 2009-10 austral summer field seasons. All data from this period were re-processed according to the equations in the MCM LTER limno methods manual, and these corrections were applied to this data package in April 2021.
McMurdo Dry Valleys LTER
Information Manager
im@mcmlter.org
McMurdo Dry Valleys LTER
http://mcmlter.org/
McMurdo Dry Valleys LTER
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 (two light and one amber), two 500 mL amber Nalgene bottles, three 150 mL borosilicate glass bottles, two 20 mL scintillation vials, and one 30 mL serum vial. A 500 mL sample from the one liter amber Nalgene bottle was decanted and filtered through a combusted Whatman 25 mm GF/F filter (475 °C for 4 hours). The filter was placed onto an aluminum weighing pan and air dried. Once the filters were dry, the pans were stacked together and frozen for later analysis. Filters were acidified with HCL fumes, and analyzed using an Elemental Analyzer (currently a CE Elantech Flash EA 1112 Elemental Analyzer). Total particulate organic carbon (POC) and particulate organic nitrogen (PON) was obtained by comparison with an acetanilide standard curve. Prior to the 0304 season, analysis was done on a 10 mm diameter sub-sample punch of the GF/F filter; from 0304 to present, the entire GF/F filter was analyzed. See the maintenance section for further details regarding data from 2003-04 thru the 2019-20 field seasons. Instrument detection limits for POC and PON are 10 μg punch-1 and 5 μg punch-1 respectively.
LIMNO_POC_PON
mcmlter-lake-poc_pon-20220630.csv
492348
1
1
\n
column
,
"
https://mcm.lternet.edu/sites/default/files/data/mcmlter-lake-poc_pon-20220630.csv
DATASET_CODE
DATASET_CODE
Code to designate the table name
string
Code to designate the table name
LIMNO_RUN
Limno Run
Code for lake's sampling location and date
string
Code for lake's sampling location and date
Location Name
Location Name
Name of lake where measurement was made
string
Name of lake where measurement was made
Location Code
Location Code
Code for site where measurement was made
string
Code for site where measurement was made
DATE_TIME
DATE_TIME
Date on which sample was gathered
date
mm/dd/yyyy
Depth (m)
Depth (m)
Distance below the piezometric water level from which sample was drawn.
meter
1
real
1
45
Required entry
None given
POC (ug/L)
POC (microg L-1)
Particulate organic carbon concentration found at lake depth
ug/L
0.1
real
0
3000
Null
None given
POC (microM)
POC (microM)
Particulate organic carbon concentration found at lake depth
microM
0.1
real
0
200
Null
None given
POC Comments
POC Comments
Helpful hints about the POC sample
string
Helpful hints about the POC sample
PON (ug/L)
PON (microg L-1)
Particulate organic nitrogen concentration found at lake depth
ug/L
0.1
real
0
500
Null
None given
PON (microM)
PON (microM)
Particulate organic nitrogen concentration found at lake depth
microM
0.1
real
0
20
Null
None given
PON Comments
PON Comments
Helpful hints about the PON sample
string
Helpful hints about the PON sample
C:N
C:N
Carbon to Nitrogen Ratio
dimensionless
0.1
real
Null
None given
Sample Comments
Sample Comments
Helpful hints about the overall sample
string
Helpful hints about the overall sample
File Name
File Name
Name of file in which data was submitted
string
Name of file in which data was submitted
DEPTH MASL
DEPTH MASL
Depth referred to the Sea level. Distance below Mean Average Sea water level reference from which sample was drawn
meter
1
real