uid=MCM,o=EDI,dc=edirepository,dc=org all public read limnysi John Priscu jpriscu@montana.edu https://orcid.org/0000-0001-5807-6364 McMurdo Dry Valleys LTER http://mcmlter.org/ Amy Chiuchiolo

LRES, 334 Leon Johnson Hall Bozeman MT 59717 US

(406) 994-2360 (406) 994-5863 achiuchiolo@montana.edu 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 data manager 2015-01-26 English

As part of the Long Term Ecological Research (LTER) project in the McMurdo Dry Valleys of Antarctica, a series of Taylor Valley lakes have been monitored for dissolved oxygen and temperature profiles. A YSI dissolved oxygen meter was used to record these measurements in the perennial ice-covered lakes of Taylor Valley. The measurements were collected from 1993 to 2000. Other methodologies to monitor temperatures and dissolved oxygen in lakes are being used.

Antarctica lake limnology temperature YSI Station Keywords

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https://mcm.lternet.edu/content/temperature-and-profiles-ysi-1993-2000 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 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 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 1993-10-28 2000-01-05 Metadata and data were migrated into DEIMS to enhance services in 2015 (San Gil).   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.   By 2006 metadata was standardized using the EML format, the data was packed as a comma delimited file (csv),  metadata was rendered in a webpage using a XSLT transformation for the EML XML (Gardner and San Gil).     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 lktemps.metadata.txt and Metaysi9697.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.   McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER

A YSI Model 58 meter with a YSI 5739 probe was used to record temperature and dissolved oxygen profiles. Calibration of the meter and probe was performed in water saturated air, near 0 degrees C, with the salinity correction set to 0 ppt. All measurements were recorded with the same salinity correction (0 ppt). The probe was manually agitated by slowlay moving in an up and down motion (~2 cm). Once the probe stabilized, the data was recorded.

LIMNO_DO_TEMP LIMNO_DO_TEMP.csv 205779 27 1 \n column , " https://mcm.lternet.edu/sites/default/files/LIMNO_DO_TEMP.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 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 YSI Temp (C) YSI Temp ( degrees C) Temperature measured at lake depth celsius 0.1 real 0 100 Null None given YSI Temp Comments YSI Temp Comments Helpful hints about the YSI Temp sample string Helpful hints about the YSI Temp 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