uid=MCM,o=EDI,dc=edirepository,dc=org all public read limnph Hydrogen ion concentrations (pH) in discrete water column samples collected from lakes in the McMurdo Dry Valleys, Antarctica (1993-2022, ongoing) Cristina Takacs-Vesbach cvesbach@unm.edu http://www.vesbachlab.org https://orcid.org/0000-0002-5535-2201 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
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
2024-01-03 English
As part of the McMurdo Long Term Ecological Research (LTER) project in the Dry Valleys of Antarctica, hydrogen ion concentrations were monitored in various lakes of the region. An Orion portable pH meter was used to record hydrogen ion concentrations at depth specific intervals in perennial ice-covered lakes.
hydrogen ions lakes limnology ph LTER Controlled Vocabulary chemistry hydrogen ion lake limnology pH Station Keywords inorganic nutrients LTER Core Areas
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https://mcm.lternet.edu/content/hydrogen-ion-concentrations-ph-discrete-water-column-samples-collected-lakes-mcmurdo-dry Don Juan Pond is located in the west end of the Wright Valley. It is wedged between the Asgard Range and the Dias. On the west end there is a small tributary and a feature that has been described as a rock glacier. Don Juan Pond is a shallow (i.e. flat bottom) hyper-saline pond. The salinity is high enough that it doesn't freeze even in winter. Therefore, unlike other lakes and ponds in the dry valleys, it has no ice cover. It has been described as a groundwater discharge zone. The dominant ions in solution are calcium and chloride. The area around Don Juan Pond is covered with sodium chloride and calcium chloride salts that have been precipitated as the water evaporated. Area and volume of Don Juan Pond varies over time. According to the USGS topo map published in 1977, the area was approximately 0.25 sq. km. However, in recent years the size of the pond has shrunk considerably. The pond has changed over the past 5 years although this is mostly anecdotal. The maximum depth in 93-94 was described as "a foot deep." In Jan 97, it was approximately 10cm deep; in Dec 98 the pond was almost dry everywhere except for an area 10's of sq meters. Most of the water that was left was restricted to depressions around large boulders in the pond. Valley: Wright Distance to Sea : 60 Maximum Length (km): 0.75 Maximum Width (km): 0.35 Maximum Depth (m): 0.1 161.190994262695 161.190994262695 -77.561897277832 -77.561897277832 200 200 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. 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 Lake Brownworth is a meltwater lake west of Wright Lower Glacier at the east end of Wright Valley. It was named by the Advisory Committee on Antarctic Names for Frederick S. Brownworth Jr., 162.718856811523 162.823226928711 -77.417655944824 -77.442016601563 5 5 meter Lake Chad is in the Lake Hoare basin, Taylor Valley, west of Lake Hoare and east of the Suess Glacier. Wharton, House and McKay streams flow from the Suess Glacier directly into Lake Chad and then the overflow from Lake Chad flows into Lake Hoare. Valley: Taylor Distance to Sea : 24 Maximum Length (km): 1 Maximum Width (km): 0.2 Maximum Depth (m): 5.5 Surface Area (km^2): 0.15 Ice Thickness Average Surface (m): 3.5 - 4.5 162.745544433594 162.785705566406 -77.640029907227 -77.644386291504 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 Garwood is located in the Garwood Valley, adjacent to McMurdo Sound on the east side. It is fed by the Garwood River, which contains meltwater from Garwood Glacier, as well as Joyce Glacier, which melts into Lake Colleen, which in turn flows into the Garwood River. Valley: Garwood Distance to Sea : 0.01 164.276672363281 164.310836791992 -78.030540466309 -78.034614562988 10 10 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 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 2022-12-22 202312: Suspect pH values from the following limno runs were removed and also noted in the comments field for the respective measurements: 06/07 Lake Fryxell L1 06/07 Lake Hoare L1 06/07 West Lobe Bonney L1 08/09 East Lobe Bonney L1 15/16 East Lobe Bonney L1 15/16 West Lobe Bonney L1 (top value only) 15/16 Lake Fryxell L2 16/17 Lake Miers L1 18/19 West Lobe Bonney L2 (25-35m values only) Data from this table was submitted to INSTAAR by the MCM LTER limnology team based out of Montana State University and the University of Alabama. The 1993-94, 1994-95, 1995-96, 1996-97 and 1997-98 data was submitted by Kathy Welch at the University of Alabama. 1996-97 and 1997-98 data was also submitted by Craig Wolf at Montana State University. Since 1998, there was some overlap between these files, the records from Montana State University were used. Only two of the records in the pH9697.txt file (from Kathy Welch at the University of Alabama) were added to this dataset since they were not in the files from Montana. The raw data files listed under 'file name' are the names of the original ascii text files used. 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 submitted by Craig Wolf at Montana State University in the MetapH9697.rtf file. The file was called up using Microsoft Word version 6.0, allowing its text to be used to create this page in html format. In 2006 metadata was standardized to the EML format and served through the website using an XSLT transform. The pH data is entered in the database each season after curation by Amy (Priscu's group). From there, data is accessed through the MCM LTER website, using java server scripts producing a comma delimited format. In October 2007, the data manager (Chris Gardner) removed the DO columns in this table at the request of John Priscu. The DO values were found to be innacurate, but the table was kept for the temperature readings In 2014, the dependency on the EML format for metadata was removed. All information about the datasets was managed by the Drupal Ecological Information Management System (San Gil). Services for external clearinghouses were expanded using ISO, BDP and EML to offer metadata and data holdings to third parties. 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 for pH analysis were decanted into 20 mL scintillation vials. A portable Beckman phi 10 or 12 PH meter (until 1415 season) or a Beckman phi 265 PH/Temp/mV meter (1516 season until current) with a combination pH electrode was used to record hydrogen ion concentration and temperature of each sample. The meter and probe were double endpoint calibrated with pH 4, 7, or 10 buffers (phi 10 or 12 meter) or calibrated with 4, 7 and 10 buffers using automatic buffer recognition. The probe was manually agitated by slowly moving in an up and down motion (~1 cm). Once the probe stabilized, the data were recorded.
LIMNO_PH pH data mcmlter-lake-ph-20240103.csv 376602 1 1 \n column , " https://mcm.lternet.edu/sites/default/files/data/mcmlter-lake-ph-20240103.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 Location in the lake where measurement was made string Location in the lake where measurement was made DATE_TIME DATE_TIME Date when sample was collected date MM/DD/YYYY DEPTH (m) Depth (m) Distance below the piezometric water level from which sample was drawn meter 1 real 1 80 Required entry None given pH pH hydrogen ion concentration found at lake depth pH 0.01 real 0 14 Null None given pH COMMENTS pH Comments Helpful hints about the pH sample string Helpful hints about the pH 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
pH