LIMNO_ALPS_POC_PON English utf8 dataset McMurdo Dry Valleys LTER http://mcmlter.org/ 2016-09-12 ISO 19115-2 Geographic Information - North American Profile Metadata - Data with Biological Extensions ISO 19115-2:2009(E) Lake Bonney Autonomous Lake Profiler and Samplers (ALPS): Particulate Organic Carbon and Nitrogen Concentrations 2016-09-12 publication Cristina Takacs-Vesbach University of New Mexico https://www.unm.edu/ cvesbach@unm.edu http://www.vesbachlab.org pointOfContact Peter Doran Louisiana State University http://lsu.edu pdoran@lsu.edu https://www.lsu.edu/science/geology/people/faculty/doran.php pointOfContact John Priscu Montana State University http://www.montana.edu/ jpriscu@montana.edu pointOfContact documentDigital Knowledge of the McMurdo Dry Valley (MDV) lakes is limited by winter access, a period which is most relevant in understanding the habitability of other icy worlds and critical to understanding the overall function of these lakes.  Owing to the lack of winter access, data that normally require human presence are incomplete.  Our goal was to conduct the first year-round investigation of the biogeophysics of these unique lakes.  An important part of the McMurdo Long Term Ecological Research (LTER) is evaluating carbon and nitrogen budgets in perennial ice-covered lakes. This data set addresses this core area of research and quantifies the particulate carbon and nitrogen found at specific depths in McMurdo Dry Valley lakes. Name: Luke Winslow Role: field crew Name: Heather Buelow Role: field crew Name: Jeff Patriarche Role: field crew Name: Maciej K. Obryk Role: field crew Name: Inigo San Gil Role: data manager completed McMurdo Dry Valleys LTER http://mcmlter.org/ organic matter theme LTER Core Areas English 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 -77.727287292480 -77.714805603027 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 -77.724441528320 -77.697700500488 ground condition 2013-12-01 2014-12-14 https://mcm.lternet.edu/sites/default/files/data/LIMNO_ALPS_POC_PON.csv LIMNO_ALPS_POC_PON eng; US McMurdo Dry Valleys LTER LIMNO_ALPS_POC_PON Data Source Definition : Details about the entity containing (spreadsheet) the ALPS POC_PON data, such as parameter names, units, definitions and other details. Record Delimiter : \n Number of Header Lines : 28 Number of Footer Lines : 1 Orientation : Column Quote Character : "Field Delimiter : , false DATASET_CODE Code to designate the table name Location Name Name of lake where measurement was made Location Code Code for site where measurement was made DATE_TIME Date on which sample was gathered Date Time Format: MM/DD/YYYY Depth (m) Distance below the piezometric water level from which sample was drawn. VOLUME_FILTERED How much sample was actually filtered POC (ug/L) Particulate organic carbon concentration found at lake depth POC (microM) Particulate organic carbon concentration found at lake depth PON (ug/L) Particulate organic nitrogen concentration found at lake depth PON (microM) Particulate organic nitrogen concentration found at lake depth C:N Carbon to Nitrogen Ratio Sample Comments Helpful hints about the overall sample File Name Name of file in which data was submitted DBF https://mcm.lternet.edu/sites/default/files/data/LIMNO_ALPS_POC_PON.csv dataset Lake water samples were collected at 15m in both lobes of Lake Bonney with the McLane Remote Access Sampler (RAS) 48 times approximately every nine days from December 2013 to December 2014. Each sample was pumped into a 500 ml sample bag, to which we added 5 mL of saturated mercuric chloride (10g 100 ml-1 or 1 mg ml-1 final concentration) before deployment. After redeployment of the RAS, sample bags were stored in 1000 ml Nalgene bottles and shipped to the US for analysis. Water for analysis was filtered through a combusted Whatman 25 mm GF/F filter (475 degrees C for 4 hours). After the sample was filtered, the filter tower was rinsed with 20 mL of deionized water. The filter was placed onto an aluminum weighing pan and air dried. Once the filters were dry, a filter paper punch was used to take a sub-sample (10 mm diameter) from the Whatman 25 mm GF/F filter and was analyzed using a Carlo-Erba Elemental Analyzer. The elemental analyzer was standardized with acetanilide. Total particulate organic carbon (POC) and particulate organic nitrogen (PON was obtained by dividing the total area of the seston on the filter by the punch area. Metadata Access Constraints: none Metadata Use Constraints: none annually