/* DATA DESCRIPTION: Citation: Larter, Robert D; Graham, Alastair G C; Gohl, Karsten; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Smith, James A; Deen, Tara J; Livermore, Roy A; Schenke, Hans Werner (2009): Sediment echosounding data files from the Amundsen Sea. PANGAEA, https://doi.org/10.1594/PANGAEA.708219, Supplement to: Larter, RD et al. (2009): Subglacial bedforms reveal complex basal regime in a zone of paleo-ice stream convergence, Amundsen Sea Embayment, West Antarctica. Geology, 37(5), 411-414, https://doi.org/10.1130/G25505A.1 Abstract: The flow of ice streams, which account for most discharge from large ice sheets, is controlled by processes operating at their bed. Data from modern ice stream beds are difficult to obtain, but where ice advanced onto continental shelves during glacial periods extensive areas of the former bed can be imaged using modern swath sonar tools. We present new multibeam swath bathymetry data analyzed alongside sparse pre-existing data from the Amundsen Sea Embayment. The compilation is the most extensive, continuous area of multibeam data coverage yet obtained on the inner continental shelf of Antarctica. The data reveal streamlined subglacial bedforms that define a zone of paleo-ice stream convergence but, in contrast to previous models, do not show a simple down-flow progression of bedform types along paleo-ice stream troughs. We interpret high spatial variability of bedforms as indicating a complex mechanical and hydrodynamic regime at the former ice stream beds, consistent with observations from some modern ice streams. We conclude that care must be taken when using bedforms to infer paleo-ice stream velocities. Project(s): Paleoenvironmental Reconstructions from Marine Sediments @ AWI (AWI_Paleo) (URI: https://www.awi.de/en/science/geosciences/marine-geology.html) Coverage: MEDIAN LATITUDE: -73.108492 * MEDIAN LONGITUDE: -109.584950 * SOUTH-BOUND LATITUDE: -74.571100 * WEST-BOUND LONGITUDE: -118.798300 * NORTH-BOUND LATITUDE: -70.494100 * EAST-BOUND LONGITUDE: -102.596500 DATE/TIME START: 2006-02-23T12:00:00 * DATE/TIME END: 2006-03-18T12:00:00 Event(s): PS69/4-track * LATITUDE START: -53.144700 * LONGITUDE START: -70.909100 * LATITUDE END: -53.144700 * LONGITUDE END: -70.909100 * DATE/TIME START: 2006-02-11T09:00:00 * DATE/TIME END: 2006-04-10T18:00:00 * CAMPAIGN: ANT-XXIII/4 (PS69) (URI: https://doi.org/10.2312/BzPM_0557_2007) * BASIS: Polarstern (URI: https://doi.org/10.17815/jlsrf-3-163) * METHOD/DEVICE: Underway cruise track measurements (CT) Comment: see also http://www.marine-geo.org/tools/search/DataSets.php?data_set_uids=9112,9126 Parameter(s): DATE/TIME (Date/Time) * GEOCODE LATITUDE (Latitude) * GEOCODE LONGITUDE (Longitude) * GEOCODE Course [deg] (Course) * PI: Kuhn, Gerhard (https://orcid.org/0000-0001-6069-7485, gerhard.kuhn@awi.de, http://www.awi.de/en/about-us/organisation/staff/gerhard-kuhn.html) Speed [kn] (Speed) * PI: Kuhn, Gerhard (https://orcid.org/0000-0001-6069-7485, gerhard.kuhn@awi.de, http://www.awi.de/en/about-us/organisation/staff/gerhard-kuhn.html) Uniform resource locator/link to raw data file (URL raw) * PI: Kuhn, Gerhard (https://orcid.org/0000-0001-6069-7485, gerhard.kuhn@awi.de, http://www.awi.de/en/about-us/organisation/staff/gerhard-kuhn.html) * METHOD/DEVICE: ParaSound (Atlas Hydrographic) (URI: hdl:10013/epic.26909.d001) * COMMENT: ps3-files as tar-archive License: Creative Commons Attribution 3.0 Unported (CC-BY-3.0) (URI: https://creativecommons.org/licenses/by/3.0/) Size: 72 data points */ Date/Time Latitude Longitude Course [deg] Speed [kn] URL raw 2006-02-23 -70.4941 -102.5965 217.1 5.6 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060223_ps3.tar 2006-02-24 -72.0965 -104.4668 174.8 0.3 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060224_ps3.tar 2006-02-25 -71.8552 -106.3168 353.2 0.4 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060225_ps3.tar 2006-02-26 -71.7161 -104.1600 195.5 4.9 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060226_ps3.tar 2006-02-27 -71.5626 -111.3264 269.5 5.5 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060227_ps3.tar 2006-02-28 -73.0690 -114.8702 157.6 2.6 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060228_ps3.tar 2006-03-01 -74.2841 -110.2015 177.3 4.6 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060301_ps3.tar 2006-03-02 -73.2065 -115.6373 7.2 0.5 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060302_ps3.tar 2006-03-03 -73.9154 -111.7003 117.9 2.6 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060303_ps3.tar 2006-03-04 -73.2069 -115.6365 96.9 0.3 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060304_ps3.tar 2006-03-05 -73.7715 -118.7983 353.2 2.6 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060305_ps3.tar 2006-03-06 -73.8896 -117.7807 282.7 1.4 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060306_ps3.tar 2006-03-07 -73.9231 -117.0533 250.4 3.0 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060307_ps3.tar 2006-03-08 -74.2375 -110.4897 126.8 4.3 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060308_ps3.tar 2006-03-09 -72.9357 -112.1238 340.5 2.6 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060309_ps3.tar 2006-03-10 -72.9694 -115.3331 359.5 2.6 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060310_ps3.tar 2006-03-11 -74.2834 -110.3339 139.2 4.3 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060311_ps3.tar 2006-03-12 -74.1028 -106.9253 172.3 4.9 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060312_ps3.tar 2006-03-13 -74.3173 -102.9467 32.4 2.6 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060313_ps3.tar 2006-03-14 -74.5711 -103.6420 304.7 2.6 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060314_ps3.tar 2006-03-15 -72.9996 -103.9949 24.7 0.2 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060315_ps3.tar 2006-03-16 -73.4451 -103.6640 181.0 3.3 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060316_ps3.tar 2006-03-17 -72.2340 -104.4877 164.8 0.9 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060317_ps3.tar 2006-03-18 -71.5173 -105.5531 326.3 4.3 https://hs.pangaea.de/para/ps69/antxxiii4/PAR_PS3/PAR060318_ps3.tar