Peter T. DoranJohn C. PriscuCristina D. Takacs-Vesbach 2017-02-14 tabular digitial data McMurdo Dry Valleys LTER McMurdo Dry Valleys LTER 10.6073/pasta/0f0240b0fab4543c6e773f3543656d48 https://mcm.lternet.edu/content/lake-bonney-autonomous-lake-profiler-and-samplers-alps-conductivity-temperature-and-pressure 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. 2013-12-01 2015-12-14 ground condition 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. 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 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 [term:vocabulary] None <cntorg>McMurdo Dry Valleys LTER</cntorg> <onlink>http://mcmlter.org/</onlink> <span property="dc:title" content="McMurdo Dry Valleys LTER" class="rdf-meta element-hidden"></span> 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 Not Applicable Not Applicable Field and/or Lab Methods 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.  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.  unknown LIMNO_ALPS_ENDCAP Details about the spreadsheet containing the Limnology ALPS endcap data, such as parameters definitions, units used, missing values and the likes. DATASET_CODE DATASET_CODE The data provider DATASET_CODE LOCATION_NAME LOCATION_NAME The data provider LOCATION_NAME LOCATION CODE LOCATION CODE, in this case, it is Bonw20 The data provider LOCATION CODE, in this case, it is Bonw20 DATE_TIME Date and time when this data point was collected The data provider calendar date/time MM/DD/YYYY HH24:Mi:ss gregorian calendar CONDUCTIVITY Conductivity of water at specific depth The data provider 4 900 mmho/cm 1 TEMPERATURE Water Temperature at specific depth The data provider celsius 0.0001 PRESSURE Pressure readings for current location of sensors The data provider 0 45 decibar 0.01 DISSOLVED OXYGEN Dissolved Oxygen Concentration at specific depth The data provider 0 17 milligramsPerLiter .01 McMurdo Dry Valleys LTER The data distributor shall not be liable for innacuracies in the content http 1 0 \r\n 1 column , https://mcm.lternet.edu/sites/default/files/data/ALPS_WLB_endcap.csv None LIMNO_ALPS_ENDCAP_ELB Details about the spreadsheet containing the Limnology ALPS endcap data at East Bonney, such as parameters definitions, units used, missing values and the likes. DATASET_CODE DATASET_CODE The data provider DATASET_CODE LOCATION_NAME LOCATION_NAME The data provider LOCATION_NAME LOCATION CODE LOCATION CODE, in this case, it is Bonw20 The data provider LOCATION CODE, in this case, it is Bonw20 DATE_TIME Date and time when this data point was collected The data provider calendar date/time MM/DD/YYYY HH24:Mi:ss gregorian calendar CONDUCTIVITY Conductivity of water at specific depth The data provider 4 900 mmho/cm 1 TEMPERATURE Water Temperature at specific depth The data provider celsius 0.0001 PRESSURE Pressure readings for current location of sensors The data provider 0 45 decibar 0.01 DISSOLVED OXYGEN Dissolved Oxygen Concentration at specific depth The data provider 0 17 milligramsPerLiter .01 McMurdo Dry Valleys LTER The data distributor shall not be liable for innacuracies in the content http 1 0 \r\n 1 column , https://mcm.lternet.edu/sites/default/files/data/ALPS_ELB_endcap.csv None 2017-02-14 2017-02-14 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