uid=MCM,o=EDI,dc=edirepository,dc=org all public read LIMNO_CACTD Devin Castendyk castendn@gmail.com https://orcid.org/0000-0002-8150-5566 Diane McKnight diane.mcknight@colorado.edu https://orcid.org/0000-0002-4171-1533 McMurdo Dry Valleys LTER http://mcmlter.org/ Renée Brown rfbrown@unm.edu https://orcid.org/0000-0002-4986-7663 data manager 2021-09-01 English

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.

Antarctica conductivity CTD density depth lake limnology LTER McMurdo Dry Valleys specific conductivity Taylor Valley temperature water temperature Station Keywords conductivity CTD density depth lakes limnology salinity specific conductivity temperature water column water properties water temperature LTER Controlled Vocabulary Funding provided by the National Science Foundation Grants #OPP-1115245 and #OPP-1637708 for Long Term Ecological Research.

This data package is released under the Creative Commons Attribution 4.0 International License (CC BY 4.0; http://creativecommons.org/licenses/by/4.0/), which allows consumers (hereinafter referred to as “Data Users”) to freely reuse, redistribute, transform, or build on this work (even commercially) so long as appropriate credit is provided. Accordingly, Data Users are required to properly cite this data package in any publications or in the metadata of any derived products that result from its use (in whole or in part). A recommended citation is provided on the summary metadata page associated with this data package in the McMurdo Dry Valleys LTER Data Catalog (https://mcmlter.org/data), and a generic citation may be found on the summary metadata page in the repository where this data package was obtained. When these data contribute significantly to the contents of a publication, Data Users must also acknowledge that data were provided by the NSF-supported McMurdo Dry Valleys Long Term Ecological Research program (OPP-2224760). This data package has been released in the spirit of open scientific collaboration. Hence, Data Users are strongly encouraged to consider consultation, collaboration, and/or co-authorship (as appropriate) with the data package creator(s). Data Users should be aware these data may be actively used by others for ongoing research; thus, coordination may be necessary to prevent duplicate publication. Data Users should also recognize that misinterpretation of data may occur if they are used outside the context of the original study. Hence, Data Users are urged to contact the data package creator(s) if they have any questions regarding methodology or results. While substantial efforts are made to ensure the accuracy of this data package (with all its components), complete accuracy cannot be guaranteed. Periodic updates to this data package may occur, and it is the responsibility of Data Users to check for new versions. This data package is made available “as is” and comes with no warranty of accuracy or fitness for use. The creator(s) of this data package and the repository where these data were obtained shall not be liable for any damages resulting from misinterpretation, use, or misuse of these data. Finally, as a professional courtesy, we kindly request Data Users notify the primary contact referenced in the metadata when these data are used in the production of any derivative work or publication. Notification should include an explanation of how the data were used, along with a digital copy of the derived product(s). Thank you.

https://mcm.lternet.edu/content/weekly-ctd-profile-measurements-conductivity-specific-conductance-temperature-depth-density Location of the Lake Hoare limno hole during the 2012-2013 austral summer. 162.910500000000 162.910500000000 -77.627630000000 -77.627630000000 2012-11-25 2013-01-21 McMurdo Dry Valleys LTER Information Manager im@mcmlter.org McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER

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).

LIMNO_CACTD mcmlter-limno-castendyk-cactd-20210901.csv 325605 1 0 column , https://mcm.lternet.edu/sites/default/files/data/mcmlter-limno-castendyk-cactd-20210901.csv DATASET_CODE Dataset code Internal dataset code. string Internal dataset code. LOCATION_NAME Location name Name of lake where the measurement was made. string Name of lake where the measurement was made. LOCATION_CODE Location code Internal location code, corresponding to core limno runs. string Internal location code, corresponding to core limno runs. DATE_TIME Date and time Date and time when the measurement was made. New Zealand time zone, daylight savings time observed. date MM/DD/YYYY HH:MM CONDUCTIVITY_USCM Conductivity Electrical conductivity of the water. microSiemenPerCentimeter real SPECIFIC_CONDUCTANCE_USCM Specific conductance Electrical conductivity of the water at 25 degrees C. microSiemenPerCentimeter real TEMPERATURE_C Temperature Water temperature. celsius real DEPTH_M Depth Distance below water surface. meter real DENSITY_KGM3 Density Density of the water calculated using EOS-80. kilogramsPerMeterCubed real SALINITY_PSS Salinity Oceanographic salinity of the water calculated using EOS-80. practicalSalinityScale real conductivity unit