uid=MCM,o=EDI,dc=edirepository,dc=org all public read LHBB_PRESS Hilary Dugan hdugan@wisc.edu https://dugan.limnology.wisc.edu https://orcid.org/0000-0003-4674-1149 Peter Doran pdoran@lsu.edu https://www.lsu.edu/science/geology/people/faculty/doran.php https://orcid.org/0000-0002-3774-2847 McMurdo Dry Valleys LTER http://mcmlter.org/ Renée Brown rfbrown@unm.edu https://orcid.org/0000-0002-4986-7663 data manager 2020-09-10 English

As part of the McMurdo Dry Valleys Long Term Ecological Research program, continuous stage (lake level) and ice surface ablation were collected at Lake Hoare, located in Taylor Valley, Antarctica. This package contains data measured at 1-minute intervals from Nov 2012 to Apr 2013, Nov 2013 to Feb 2014, and Nov 2014 to Oct 2016.

lake level lakes LTER Controlled Vocabulary ablation Antarctica lake lake level LTER McMurdo Dry Valleys stage Taylor Valley Station Keywords disturbance LTER Core Areas

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/high-frequency-1-min-pressure-measurements-continuous-stage-lake-level-and-ice-surface Lake Hoare occupies a narrower portion of the Taylor Valley, dammed by the Canada Glacier. It would drain almost completely without this dam. There are a number of islands which may be related to an old terminal of Canada Glacier. The lake is fed primarily from direct runoff from the glacier, as well as meltwater streams. (Lake level rose ~1.5 m between 1972 and 1996). There are no surface outflows; the only known water loss is through ice ablation (evaporation, sublimation and physical scouring). Valley: Taylor Distance to Sea : 15 Maximum Length (km): 4.2 Maximum Width (km): 1 Maximum Depth (m): 34 Surface Area (km^2): 1.94 Ice Thickness Average Surface (m): 3.1 - 5.5 Volume (m^3 * 10^6): 17.5 162.784423828125 162.935836791992 -77.623085021973 -77.639259338379 73 73 meter 2012-10-28 2016-10-22 McMurdo Dry Valleys LTER Information Manager im@mcmlter.org McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER

Two pressure sensors (Campbell Scientific, CS-455) are moored beneath the ice cover of Lake Hoare above the deepest portion of the lake beside the Limno Hole. The pressure sensors are part of a long-term monitoring program, and have been in operation for over a decade. One sensor is moored on a buoy weighted to the bottom of the lake and measures lake level (stage), while the other is frozen into the ice cover and measures ice ablation (Dugan et al. 2013, Winslow et al. 2014). Both sensors sit approximately 10 m beneath the ice cover, and are vented at the surface to correct for barometric pressure changes. In 2012, we programmed the Campbell Scientific CR1000 datalogger to record high frequency pressure changes at 1-minute intervals. Data were recorded from Nov 2012 to Apr 2013, Nov 2013 to Feb 2014, and Nov 2014 to Oct 2016.Ablation and stage are relative depths, and the absolute values cannot be compared between different data years. Dugan, H. A., M. K. Obryk, and P. T. Doran. 2013. Lake ice ablation rates from permanently ice-covered Antarctic lakes. J. Glaciol. 59(215), doi:10.3189/2013JoG12J080.Winslow, L. A., H. A. Dugan, H. Buelow, K. D. Cronin, J. C. Priscu, C. Vesbach, and P. T. Doran. 2014. Autonomous year-round sampling and sensing to explore the physical and biological habitability of permanently ice-covered Antarctic lakes. Mar. Technol. Soc. J. 48: 8-17.

LHBB_PRESS Lake Hoare 1-min Pressure Data LHBB_PRESS.csv 80542615 1 column , https://mcm.lternet.edu/sites/default/files/data/LHBB_PRESS.csv DATASET_CODE Dataset code Internal dataset code. string Internal dataset code. DATE_TIME Timestamp Date and time the sample was taken. date YYYY-MM-DD HH:MM:SS ABLATION_MM Ablation Ablation measurement from pressure transducer moored from ice cover. millimeter real STAGE_MM Stage Stage measurement from pressure transducer moored from the bottom of the lake. millimeter real