Mathematics – Logic
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmpp42b0526m&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #PP42B-0526
Mathematics
Logic
0400 Biogeosciences, 1899 General Or Miscellaneous, 3344 Paleoclimatology, 8199 General Or Miscellaneous, 9609 Mesozoic
Scientific paper
The past surface relief of the Earth is an essential boundary condition for computer-based atmosphere and ocean modeling. It also provides the geographic context for understanding surface processes and biotic distributions and interactions. However, with increased model resolution and the addition of vegetation, soil (weathering) and chemical modules, there is now a need for more robust, detailed paleo-topographies and bathymetries that are fully integrated with the processes being modeled, especially the hydrological system (hydrologically correct). Here I present a new GIS-based, hydrologically correct, paleo-DEM for the Maastrichtian (Late Cretaceous). This project was initiated in 1995 while the author was a graduate at the University of Chicago using the plate reconstructions of Rowley (1995, unpublished). The Maastrichtian paleogeography used in this study is one of a series of 27 global maps, representing the Cretaceous and Cenozoic, being compiled simultaneously to ensure continuity between each time interval. Each map is generated at a scale of 1:30 million in ArcView GIS and ArcInfo, using data from the author's own databases of lithologic, tectonic and fossil information, the lithologic databases of the Paleogeographic Atlas Project (The University of Chicago), a survey of published literature, and DSDP / ODP data. Interpretations of elevation are derived following the methods outlined in Ziegler et al (1985), an understanding of the tectonic regime and evolution of each geographic feature, and the age-depth relationship for the ocean. The Maastrichtian has been completed first to provide the boundary conditions for a coupled atmosphere-ocean experiment. The hydrologically correct global DEM was derived using the elevation contours from the paleogeography and the suite of hydrological tools now available in ArcInfo GRID. The DEM has been constrained by defining areas of paleo-internal drainage, paleo-river mouths and known paleo-river courses. When integrated with the results of the coupled ocean-atmosphere model the result is a powerful tool for understanding surface processes and an important step towards the development of a fully evolving Earth Systems model. Ziegler, A.M., D.B. Rowley, A.L. Lottes, D.L. Sahagian, M.L. Hulver, and T.C. Gierlowski, 1985. Paleogeographic interpretation: with an example from the Mid-Cretaceous. In: G.W. Wetherill et al. (eds.). Annual Review of Earth and Planetary Sciences 13: 385-425. Palo Alto, CA: Annual Reviews, Inc.
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