Cristina D. Takacs-VesbachJohn C. Priscu 2014-11-04 tabular digitial data McMurdo Dry Valleys LTER McMurdo Dry Valleys LTER 10.6073/pasta/316ea94d5a90c7b55a005d10a64bce4b https://mcm.lternet.edu/content/dissolved-inorganic-carbon-dic-concentrations-discrete-water-column-samples-collected-lakes The McMurdo Long Term Ecological Research (LTER) project monitors patterns of inorganic material transport in perennial ice-capped lakes. This data set addresses this core area of research and quantifies dissolved inorganic carbon concentrations at specific depths in McMurdo Dry Valley lakes. Dissolved inorganic carbon is also necessary for the computation of primary productivity. 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. 1993-10-27 2023-11-21 ground condition 2015 - data and metadata managed now using the Drupal Ecological Information Management System  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 Metadic9697.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. As needed 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): 54.7 162.536209106445 162.353210449219 -77.697700500488 -77.724441528320 57m 57m 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., 162.823226928711 162.718856811523 -77.417655944824 -77.442016601563 5m 5m meter Narrows between Lake Chad and Lake Hoare is a short spillway approximately 5m long between Lake Chad and Lake Hoare. Wharton, House and McKay streams flow into Lake Chad from the Suess Glacier. The overflow from Lake Chad then flows into the west end of Lake Hoare. There are many microbial mats in this area between the Hoare and Chad moats and around the spillway. Valley: Taylor Distance to Sea : 24 Maximum Length (km): 0.005 162.793258666992 162.774902343750 -77.639038085938 -77.641983032227 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): 25.2 163.259582519531 163.048782348633 -77.597076416016 -77.622711181641 18m 18m 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 : 0.01 164.310836791992 164.276672363281 -78.030540466309 -78.034614562988 10m 10m 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): 17.5 162.935836791992 162.784423828125 -77.623085021973 -77.639259338379 73m 73m 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): 4.9 161.662445068359 161.608886718750 -77.715972900391 -77.726486206055 301m 301m 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): 2.9 163.886840820313 163.812332153320 -78.094047546387 -78.101478576660 240m 240m 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. 162.823226928711 162.718856811523 -77.417655944824 -77.442016601563 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): 160 161.691970825195 161.391906738281 -77.518882751465 -77.542304992676 143m 143m 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): 10.1 162.354934692383 162.269104003906 -77.714805603027 -77.727287292480 57m 57m meter LTER Core Areas inorganic nutrients None <cntperp> <cntper>McMurdo Dry Valleys LTER Information Manager</cntper> </cntperp> <cntemail>im@mcmlter.org</cntemail> Name: Jade Lawrence Role: field technician Name: Kathleen A. Welch Role: lab technician Name: Renée F. Brown Role: data manager Name: Amy Chiuchiolo Role: former field crew Name: Inigo San Gil Role: former data manager Not Applicable Not Applicable Field and/or Lab Methods General Methodology Lake water samples are collected at specific depths with a five-liter Niskin bottle during normal LTER limnological sampling. Dissolved inorganic carbon samples (1 at each depth) are decanted through tubing directly from the Niskin bottle into a 30 mL serum vial. Lake water is allowed to overflow from the serum vial and completely displace the initial sample volume. Each sample is preserved with 0.15 mL chloroform, capped with a rubber stopper and crimped with an aluminum cap. Samples are stored in the dark at 4 degrees C until analysis. Samples are analyzed in at least duplicate following a method of sample acidification followed by infrared gas analysis using an IRGA (Infrared Gas Analyzer), and comparison to a standard curve. The standard curve is created by analyzing incremental samples of a 60 mgC/L DIC standard. The reported dissolved inorganic carbon concentrations of the lake water samples are averages of the replicate sample analyses. Analyses were performed with either an MSA Lira IRGA with HP Integrator or a Licor 6252 CO2 analyzer prior to the 2003-2004 season, with an MSA Lira IRGA with HP Integrator or Peak Simple Chromatography Data System from the 2003-2004 – 2006-2007 season, and with a Qubit Systems Infrared CO2 Analyzer with Peak Simple Chromatography Data System from the 2007-2008 season to present. Notes on 2006-2007 Season DIC Data and methods The IRGA malfunctioned during the 0607 season yielding DIC data that were highly suspect. Alkalinity titrations were done according to standard methods and DIC was estimated based on Wetzel R.G. and G.E. Likens. 1991. Limnological Analyses. 2nd Edition. Springer-Verlag New York Inc. pp. 111-118. Note that hydrogen acceptors other than the carbonate system exist in the lakes yielding an overestimate of DIC. We also computed average DIC values from the 05-06 and 07-08 seasons. DIC data changes relatively little over time; A paired t-test revealed that there was no significant difference between DIC for these 2 years (p&gt;0.05). We report in the database DIC data computed from alkalinity titrations, and provide a link in the metadata to DIC data computed from averages of 05-06 and 07-08 DIC. The file containing DIC values computed from the average of previous and next season DIC values can be found in the following link: http://mcmlter.org/data/lakes/chemistry/core/LIMNO_DIC_0607.csv"&gt;http://mcmlter.org/data/lakes/chemistry /core/LIMNO_DIC_0607.csv General MethodologyLake water samples are collected at specific depths with a five-liter Niskin bottle during normal LTER limnological sampling. Dissolved inorganic carbon samples (1 at each depth) are decanted through tubing directly from the Niskin bottle into a 30 mL serum vial. Lake water is allowed to overflow from the serum vial and completely displace the initial sample volume. Each sample is preserved with 0.15 mL chloroform, capped with a rubber stopper and crimped with an aluminum cap. Samples are stored in the dark at 4 degrees C until analysis. Samples are analyzed in at least duplicate following a method of sample acidification followed by infrared gas analysis using an IRGA (Infrared Gas Analyzer), and comparison to a standard curve. The standard curve is created by analyzing incremental samples of a 60 mgC/L DIC standard. The reported dissolved inorganic carbon concentrations of the lake water samples are averages of the replicate sample analyses. Analyses were performed with either an MSA Lira IRGA with HP Integrator or a Licor 6252 CO2 analyzer prior to the 2003-2004 season, with an MSA Lira IRGA with HP Integrator or Peak Simple Chromatography Data System from the 2003-2004 – 2006-2007 season, and with a Qubit Systems Infrared CO2 Analyzer with Peak Simple Chromatography Data System from the 2007-2008 season to present.Notes on 2006-2007 Season DIC Data and methodsThe IRGA malfunctioned during the 0607 season yielding DIC data that were highly suspect. Alkalinity titrations were done according to standard methods and DIC was estimated based on Wetzel R.G. and G.E. Likens. 1991. Limnological Analyses. 2nd Edition. Springer-Verlag New York Inc. pp. 111-118. Note that hydrogen acceptors other than the carbonate system exist in the lakes yielding an overestimate of DIC. We also computed average DIC values from the 05-06 and 07-08 seasons. DIC data changes relatively little over time; A paired t-test revealed that there was no significant difference between DIC for these 2 years (p>0.05). We report in the database DIC data computed from alkalinity titrations, and provide a link in the metadata to DIC data computed from averages of 05-06 and 07-08 DIC. The file containing DIC values computed from the average of previous and next season DIC values can be found in the following link: http://mcmlter.org/data/lakes/chemistry/core/LIMNO_DIC_0607.csv">http://mcmlter.org/data/lakes/chemistry /core/LIMNO_DIC_0607.csv unknown LIMNO_DIC Dissolved Inorganic Carbon DATASET_CODE Code to designate the table name The data provider Code to designate the table name Limno Run Code for lake's sampling location and date The data provider Code for lake's sampling location and date Location Name Name of lake where measurement was made The data provider Name of lake where measurement was made Location Code Code for site where measurement was made The data provider Code for site where measurement was made DATE_TIME Date on which sample was gathered The data provider calendar date/time mm/dd/yyyy gregorian calendar Depth (m) Distance below the piezometric water level from which sample was drawn. The data provider 1 45 meter 1 DIC (mg C/l) Dissolved inorganic carbon concentration found at lake depth - mass units The data provider 0 3000 milligramsPerLiter 0.1 DIC (mM) Dissolved inorganic carbon concentration found at lake depth - moles The data provider 0 500 mM 0.1 DIC Comments Helpful hints about the DIC sample The data provider Helpful hints about the DIC sample File Name Name of file in which data was submitted The data provider Name of file in which data was submitted DEPTH MASL Depth referred to the Sea level. Distance below Mean Average Sea water level reference from which sample was drawn The data provider meter 1 McMurdo Dry Valleys LTER The data distributor shall not be liable for innacuracies in the content http 1 0 \n 1 column , https://mcm.lternet.edu/sites/default/files/data/mcmlter-lake-dic-20250218.csv None 2014-11-04 2014-11-04 McMurdo Dry Valleys LTER http://mcmlter.org/ Biological Data Profile of the Content Standards for Digital Geospatial Metadata devised by the Federal Geographic Data Committee. Drupal Ecological information Management Systems, version D7, Biological Data Profile module