Tyler J. MackeyDawn Sumner 2016-07-22 tabular digitial data McMurdo Dry Valleys LTER UC Davis 10.6073/pasta/0aa834542a60e4d23446c4b8a69bcef2 https://mcm.lternet.edu/content/lake-joyce-near-shore-water-column-pressure-and-temperature This data set includes the deployment of an anchored pressure transducer and suspended thermistor string in Lake Joyce, Pearse Valley, as part of a NASA Astrobiology: Exobiology and Evolutionary Biology project. Instruments were deployed prior to summer melt in December 2014 near a melt water stream and retrieved in December 2015. Thermistors were positioned in the fresh water lens under the ice cover, within the water column, and on the lake bottom.This dataset is funded through the NASA grant NNX13AI60G, with USAP event G-063. This project is not funded through the MCM LTER program. MCM LTER hosts this synergistic project. 2014-12-07 2015-11-16 ground condition As needed 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 [term:vocabulary] None <cntperp> <cntper>Tyler Mackey</cntper> </cntperp> <organizationName> <cntorg>University of New Mexico</cntorg> <onlink>https://www.unm.edu/</onlink> <span property="dc:title" content="University of New Mexico" class="rdf-meta element-hidden"></span></organizationName> <cntemail>tjmackey@unm.edu</cntemail> Name: Frances Rivera-Hernandez Role: field crew Name: Justin Lawrence Role: field crew Name: Megan Krusor Role: field crew Name: Sasha Leidman Role: field crew Name: Lucy Coleman Role: field crew Name: Ian Hawes Role: field crew Name: Anne Jungblut Role: field crew Name: Inigo San Gil Role: data manager Not Applicable Not Applicable Field and/or Lab Methods The instrumentation deployed in this study were moored at one site offshore from Lake Joyce stream J2 (Green et al., 1988). The pressure transducer was an InSitu Rugged TROLL 100, anchored at the sediment-water interface at 11.5 m depth. Thermistors were each RBR Ruskin Solo T loggers suspended in the water column above the anchor. The deepest was attached at the sediment-water interface with the pressure transducer (Temp 1), followed by one thermistor suspended 0.8 m above the lake bottom (Temp 2) and one thermistor suspended at 5.5 m above the lake bottom (Temp 3). The lake bottom and 0.8 m suspended thermistors were both within the same stratified lake layer, whereas the 5.5 m suspended thermistor was in the freshwater lens immediately below the underside of the ice cover. These deployment locations were chosen to identify where inflowing melt water injected across the stratified lake structure. Following deployment, the pressure transducer readings were checked for drift by suspension on a fiberglass tape reel. Pressure transducer readings had a depth-dependent offset from pre-deployment with depth correction of 1.0448*[transducer depth(m)]-0.0884m, with assumed water specific gravity of 0.999. This correction has not been applied to the raw data set. Thermistors were checked for drift by suspension in ice water and did not show any evidence for instrumental drift. The instrumentation deployed in this study were moored at one site offshore from Lake Joyce stream J2 (Green et al., 1988). The pressure transducer was an InSitu Rugged TROLL 100, anchored at the sediment-water interface at 11.5 m depth. Thermistors were each RBR Ruskin Solo T loggers suspended in the water column above the anchor. The deepest was attached at the sediment-water interface with the pressure transducer (Temp 1), followed by one thermistor suspended 0.8 m above the lake bottom (Temp 2) and one thermistor suspended at 5.5 m above the lake bottom (Temp 3). The lake bottom and 0.8 m suspended thermistors were both within the same stratified lake layer, whereas the 5.5 m suspended thermistor was in the freshwater lens immediately below the underside of the ice cover. These deployment locations were chosen to identify where inflowing melt water injected across the stratified lake structure.Following deployment, the pressure transducer readings were checked for drift by suspension on a fiberglass tape reel. Pressure transducer readings had a depth-dependent offset from pre-deployment with depth correction of 1.0448*[transducer depth(m)]-0.0884m, with assumed water specific gravity of 0.999. This correction has not been applied to the raw data set. Thermistors were checked for drift by suspension in ice water and did not show any evidence for instrumental drift. unknown LJPressure-Temp Defintions for the lake Joyce water column study spreadsheet: units, codes, column definitions. Date Date and time when samples were acquired The data provider calendar date/time MM/DD/YYYY HH:MI24 gregorian calendar Pressure (mB) The absolute pressure, measured in millibars The data provider millibar Temp 1 C Temperature measured in celsius with the first thermistor The data provider celsius Temp 2 C Temperature measured in celsius with the second thermistor The data provider celsius Temp 3 C Temperature measured in celsius with the third thermistor The data provider celsius 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/LJpressure-temp.csv None 2016-07-22 2016-07-22 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