LIMNO_CACTD English utf8 dataset McMurdo Dry Valleys LTER Information Manager im@mcmlter.org pointOfContact 2021-09-01 ISO 19115-2 Geographic Information - North American Profile Metadata - Data with Biological Extensions ISO 19115-2:2009(E) Weekly CTD profile measurements of conductivity, specific conductance, temperature, depth, density, and salinity from Lake Hoare, McMurdo Dry Valleys, Antarctica during the 2012-2013 austral summer 2021-09-01 publication Devin Castendyk Golder Associates Inc. https://www.golder.com castendn@gmail.com pointOfContact Diane McKnight University of Colorado Boulder http://www.colorado.edu/ diane.mcknight@colorado.edu pointOfContact documentDigital As part of the McMurdo Dry Valleys Long Term Ecological Research (LTER) project, we investigated relationships between wind conditions and barotropic seiches within Lake Hoare, located in Taylor Valley, Antarctica, during the 2012-2013 austral summer. Temporal changes in the water column were measured using a rugged, handheld, CastAway CTD (conductivity-temperature-depth probe, manufactured by SonTek), deployed through the Lake Hoare Limno Hole (note, this is a separate instrument from the SeaBird CTD used as part of the MCM LTER core limnological monitoring program). The CastAway CTD directly measures temperature, electrical conductivity, and pressure at 5 Hz as it free-falls through the water column at a rate of approximately 1 m s-1 on the downward cast and approximately 0.3 m s-1 on the upward cast. The device calculates salinity and density using the International Equation of State for Seawater, called EOS-80. This data package provides 27 profiles of depth, temperature, conductivity, specific conductance, salinity, and density collected between November 25, 2012 and January 21, 2013. In general, three profiles were collected over a ten-minute-period every seven days for 57 days. Five profiles were collected prior to the arrival of spring melt, four profiles were collected during the arrival of spring melt on December 7, 2012, and 18 profiles were collected after the arrival of spring melt continuing into late summer. Name: Renée F. Brown Role: data manager completed McMurdo Dry Valleys LTER Information Manager im@mcmlter.org pointOfContact English Location of the Lake Hoare limno hole during the 2012-2013 austral summer. 162.910500000000 162.910500000000 -77.627630000000 -77.627630000000 ground condition 2012-11-25 2013-01-21 Funding provided by the National Science Foundation Grants #OPP-1115245 and #OPP-1637708 for Long Term Ecological Research. https://mcm.lternet.edu/sites/default/files/data/mcmlter-limno-castendyk-cactd-20210901.csv LIMNO_CACTD eng; US McMurdo Dry Valleys LTER LIMNO_CACTD Number of Header Lines : 1 Number of Footer Lines : 0 Orientation : Column Field Delimiter : , false DATASET_CODE Internal dataset code. LOCATION_NAME Name of lake where the measurement was made. LOCATION_CODE Internal location code, corresponding to core limno runs. DATE_TIME Date and time when the measurement was made. New Zealand time zone, daylight savings time observed. Date Time Format: MM/DD/YYYY HH:MM CONDUCTIVITY_USCM Electrical conductivity of the water. SPECIFIC_CONDUCTANCE_USCM Electrical conductivity of the water at 25 degrees C. TEMPERATURE_C Water temperature. DEPTH_M Distance below water surface. DENSITY_KGM3 Density of the water calculated using EOS-80. SALINITY_PSS Oceanographic salinity of the water calculated using EOS-80. DBF https://mcm.lternet.edu/sites/default/files/data/mcmlter-limno-castendyk-cactd-20210901.csv dataset A description of the CastAway CTD methods and equations can be downloaded from the manufacture, SonTek, at the following URL:https://www.sontek.com/media/pdfs/castaway-ctd-principles-of-operation.pdf The following procedure was used at the Lake Hoare Limno Hole: Ice was cleared from the Limno Hole. The CTD was connected to a 50-m-long nylon line attached to a hand reel with a diameter of 9.5 cm. The CTD was powered on, placed on the ice adjacent to the Limno Hole, and allowed several minutes to determine its location using its onboard GPS. The CTD was suspended 10 cm below the water surface and held in place for approximately 10 seconds. The CTD was allowed to free fall through the water column to the lake bottom on the downward cast at a rate of approximately 1 m s-1. Once the line on the surface became slack, the researcher smoothly reeled in the line for an upward cast at a rate of approximately 0.3 m s-1 (approximately 1 revolution of the reel per second). Data were sent to a laptop computer via bluetooth connection. Data were viewed and exported to CVS format using the program CastAway CTD v1.5 (SonTek, January 30, 2012). Metadata Access Constraints: none Metadata Use Constraints: none annually McMurdo Dry Valleys LTER http://mcmlter.org/ pointOfContact