LIMNO_ALPS_PAR 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): Photosynthetically Active Radiation 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 intensity of photosynthetically active radiation (PAR) 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: Amy Chiuchiolo Role: lab crew Name: Jeff Patriarche Role: lab 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. 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 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 ground condition 2013-12-01 2015-12-14 https://mcm.lternet.edu/sites/default/files/data/ALPS_ELB_PAR.csv ALPS_PAR_ELB eng; US McMurdo Dry Valleys LTER ALPS_PAR_ELB Data Source Definition : Details on the PAR data containing spreadsheet (for the ALPS) Record Delimiter : \r\n Number of Header Lines : 1 Orientation : Column Field Delimiter : , false DATASET_CODE A code to ID the data container. LOCATION_NAME The lake where data was collected LOCATION CODE The Lake code, according to the MCM LTER program. DATE_TIME Date when data point was collected Date Time Format: MM/DD/YYYY HH24:Mi:ss PRESSURE The recorded pressure in decibars, DEPTH Depth at which sample was drawn from lake PAR Photosynthetically active radiation DBF https://mcm.lternet.edu/sites/default/files/data/ALPS_ELB_PAR.csv https://mcm.lternet.edu/sites/default/files/data/ALPS_WLB_PAR.csv ALPS_PAR_WLB eng; US McMurdo Dry Valleys LTER ALPS_PAR_WLB Data Source Definition : Details on the PAR data containing spreadsheet (for the ALPS) Record Delimiter : \r\n Number of Header Lines : 1 Orientation : Column Field Delimiter : , false DATASET_CODE A code to ID the data container. LOCATION_NAME The lake where data was collected LOCATION CODE The Lake code, according to the MCM LTER program. DATE Date when data point was collected Date Time Format: MM/DD/YYYY TIME Time when sample was collected Date Time Format: HH24:Mi:SS PRESSURE The recorded pressure in decibars, DEPTH Depth at which sample was drawn from lake PAR Photosynthetically active radiation DBF https://mcm.lternet.edu/sites/default/files/data/ALPS_WLB_PAR.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 was a photosynthetically active radiation sensor (Biospherical instruments Model QCP23000). 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 10 seconds. To convert the raw sensor readings (recorded in sensor output units, millivolts), manufacturer calibration coefficients and fit equations were used.  Instrumentation:Biospherical instruments Model QCP23000McLane Labs Ice Tethered Profilers  Metadata Access Constraints: none Metadata Use Constraints: none annually McMurdo Dry Valleys LTER http://mcmlter.org/ pointOfContact