English utf8 dataset McMurdo Dry Valleys LTER http://mcmlter.org/ 2017-02-14 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): Conductivity, Temperature, and Pressure 2017-02-14 publication 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 Cristina Takacs-Vesbach University of New Mexico https://www.unm.edu/ cvesbach@unm.edu http://www.wildmicrobiome.org 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 vertical profile of conductivity, temperature, and pressure in Lake Bonney. 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/ 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 2015-12-14 https://mcm.lternet.edu/sites/default/files/data/ALPS_WLB_endcap.csv LIMNO_ALPS_ENDCAP eng; US McMurdo Dry Valleys LTER LIMNO_ALPS_ENDCAP Data Source Definition : Details about the spreadsheet containing the Limnology ALPS endcap data, such as parameters definitions, units used, missing values and the likes. Record Delimiter : \r\n Number of Header Lines : 1 Orientation : Column Field Delimiter : , false DATASET_CODE DATASET_CODE LOCATION_NAME LOCATION_NAME LOCATION CODE LOCATION CODE, in this case, it is Bonw20 DATE_TIME Date and time when this data point was collected Date Time Format: MM/DD/YYYY HH24:Mi:ss CONDUCTIVITY Conductivity of water at specific depth TEMPERATURE Water Temperature at specific depth PRESSURE Pressure readings for current location of sensors DISSOLVED OXYGEN Dissolved Oxygen Concentration at specific depth DBF https://mcm.lternet.edu/sites/default/files/data/ALPS_WLB_endcap.csv https://mcm.lternet.edu/sites/default/files/data/ALPS_ELB_endcap.csv LIMNO_ALPS_ENDCAP_ELB eng; US McMurdo Dry Valleys LTER LIMNO_ALPS_ENDCAP_ELB Data Source Definition : Details about the spreadsheet containing the Limnology ALPS endcap data at East Bonney, such as parameters definitions, units used, missing values and the likes. Record Delimiter : \r\n Number of Header Lines : 1 Orientation : Column Field Delimiter : , false DATASET_CODE DATASET_CODE LOCATION_NAME LOCATION_NAME LOCATION CODE LOCATION CODE, in this case, it is Bonw20 DATE_TIME Date and time when this data point was collected Date Time Format: MM/DD/YYYY HH24:Mi:ss CONDUCTIVITY Conductivity of water at specific depth TEMPERATURE Water Temperature at specific depth PRESSURE Pressure readings for current location of sensors DISSOLVED OXYGEN Dissolved Oxygen Concentration at specific depth DBF https://mcm.lternet.edu/sites/default/files/data/ALPS_ELB_endcap.csv dataset Through the ice, wire-walking profilers (McLane Labs Ice Tethered Profilers [ITPs]) were deployed in both lobs of Lake Bonney. Attached to the ITPs were sensors for conductivity, temperature, dissolved oxygen, and pressure (Seabird model 41CP CTD endcaps). The ITPs were programmed to profile once daily around regional solar noon. A profile consisted of one downward and one upward movement to the furthest reach of the profilers possible movement, or the bottom of the lake or bottom of the ice, whichever limit came first. During the profiles, conductivity, temperature, salinity and dissolved oxygen readings were recorded every 2 seconds. To convert the raw dissolved oxygen readings (recorded in sensor output units, hertz), manufacturer calibration coefficients and fit equations were used.  Metadata Access Constraints: none Metadata Use Constraints: none annually McMurdo Dry Valleys LTER http://mcmlter.org/ pointOfContact