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PRISM3/GISS Topographic Reconstruction

April 11, 2009

The PRISM3/GISS topographic reconstruction is one of the global data sets incorporated into a new reconstruction for the mid-Piacenzian warm interval of the Pliocene, at about 3.3 to 3.0 Ma. The PRISM3/GISS topography-gridded data set is a digitization of a graphical reconstruction, provided at 2 deg x 2 deg resolution and based on updated paleoaltimetry data and a refined land/ocean mask. Mid-Piacenzian topography as shown in this data set is generally quite similar to modern topography, with three notable differences: (1) the coastline as shown is 25 meters higher than modern sea level, reflecting the hypothesized reduction in ice sheet volume; (2) Hudson Bay is filled in to low elevation, in the absence of evidence for submergence at that time; and (3) the West Antarctic ice sheet is absent, permitting open seaways to exist in Ellsworth and Marie Byrd Lands. Two alternate ice sheet configurations with corresponding vegetation schemes are available; one is a minor modification of the PRISM2 ice reconstruction, and one is derived from the British Antarctic Survey Ice Sheet Model (BAS ISM).

Publication Year 2009
Title PRISM3/GISS Topographic Reconstruction
DOI 10.3133/ds419
Authors Linda E. Sohl, Mark A. Chandler, Robert B. Schmunk, Ken Mankoff, Jeffrey A. Jonas, Kevin M. Foley, Harry J. Dowsett
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Data Series
Series Number 419
Index ID ds419
Record Source USGS Publications Warehouse
USGS Organization U.S. Geological Survey