uid=MCM,o=EDI,dc=edirepository,dc=org all public read gis_watershed Anna Wright anna.t.wright@colorado.edu https://orcid.org/0009-0003-4709-151X McMurdo Dry Valleys LTER http://mcmlter.org/ Renée Brown rfbrown@unm.edu https://orcid.org/0000-0002-4986-7663 data manager 2023-10-23 English

This data package includes shapefiles for selected glacier, stream watershed, and stream channel boundaries in the McMurdo Dry Valleys region of Antarctica. A combination of satellite imagery and digital elevation models were used to delineate watershed and stream channel outlines, while glaciers were outlined by hand. Watershed boundaries provide an estimate of the overall topographic contributing area for each stream in Fryxell Basin, whereas stream channel boundaries provide a topographic area estimate for stream channel, beyond the wetted margin, for each stream.

remote sensing streams topography watersheds LTER Controlled Vocabulary Antarctic desert streams Antarctica glacier LTER McMurdo Dry Valleys topography Station Keywords disturbance LTER Core Areas This work was supported by the US National Science Foundation grants #OPP-1637708 and #OPP-2224760 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/shapefiles-glacier-stream-channel-and-watershed-boundaries-mcmurdo-dry-valleys-antarctica This is the Taylor Valley, a subjectively approximated contour by San Gil. We use this to denote the geographical extent of studies that encompass the whole Taylor Valley.According to Wiki contributors, the Taylor Valley is the southernmost of the three large Dry Valleys in the Transantarctic Mountains, Victoria Land, located west of McMurdo Sound. The valley extends from Taylor Glacier in the west to McMurdo Sound at Explorers Cove at the northwest head of New Harbour in the east and is about 29 kilometres (18 mi) long. It was once occupied by the receding Taylor Glacier, from which it derives its name. Taylor Valley contains Lake Bonney in the west (inward), and Lake Fryxell in the east (coastward), and Lake Hoare, Lake Chad, Mummy Pond and Parera Pond close together between the two. Further east of Lake Bonney is Pearse Valley. Taylor Valley is separated from Wright Valley in the north by Asgard Range, and from Ferrar Glacier in the south by Kukri Hills. 161.707763671880 163.624877929690 -77.519802097166 -77.808487073526 USGS site 14; kiwi site 3500001; coordinates taken from 1996-97 GPS measurements at center of weir Parent Stream: Onyx River Provenance : GPS96-97.DOC ID: onyx_vnda 161.696624800000 161.696624800000 -77.523430000000 -77.523430000000 101 101 meter USGS site 15; kiwi site 3500002; coordinates taken from 1996-97 GPS measurements at center of weir Parent Stream: Onyx River Provenance : GPS96-97.DOC ID: onyx_lwright 162.653533900000 162.653533900000 -77.444534000000 -77.444534000000 273 273 meter 2023-09-07 McMurdo Dry Valleys LTER Information Manager im@mcmlter.org McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER

A Digital Elevation Model (DEM) (Levy et al., 2014) was used to delineate selected watersheds across the Taylor and Wright Valleys in the McMurdo Dry Valleys region of Antarctica, with most efforts focused on the Lake Fryxell Basin of Taylor Valley. In ArcGIS Pro, the Watershed tool uses the “pour points” (or lowest point in the stream channel before it flows into Lake Fryxell) to assess the total contributing area above it. Each stream watershed was outlined into a polygon and assessed for total watershed area. The ice-free watershed area was created by visually outlining and removing the glacier areas. Using the Flow Accumulation tool, along with the slope and hillshade rasters created from the DEM, individual stream channels were outlined and exported as polygons.

manifest Manifest table mcmlter-gis-watershed_manifest-20231020.csv 2976 1 column , " https://mcm.lternet.edu/sites/default/files/data/mcmlter-gis-watershed_manifest-20231020_0.csv dataset_code Dataset Code Internal dataset code. string Internal dataset code. subfolder_name Subfolder Name Name of the subfolder that includes the associated shapefile. string Name of the subfolder that includes the associated shapefile. shapefile_name Shapefile Name Filename of the associated shapefile. Each shapefile consists of four separate files with the following file extensions: .dbf, .prj, .shp, .shx string Filename of the associated shapefile. Each shapefile consists of four separate files with the following file extensions: .dbf, .prj, .shp, .shx shapefile_description Shapefile Description Description of the associated shapefile. string Description of the associated shapefile. shapefiles Shapefiles mcmlter-gis-watershed_shapefiles-20231020.zip 425350 application/zip https://mcm.lternet.edu/sites/default/files/data/mcmlter-gis-watershed_shapefiles-20231020.zip undefined