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| Titel |
OESbathy version 1.0: a method for reconstructing ocean bathymetry with generalized continental shelf-slope-rise structures |
| VerfasserIn |
A. Goswami, P. L. Olson, L. A. Hinnov, A. Gnanadesikan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 8, no. 9 ; Nr. 8, no. 9 (2015-09-03), S.2735-2748 |
| Datensatznummer |
250116551
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| Publikation (Nr.) |
 copernicus.org/gmd-8-2735-2015.pdf |
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| Zusammenfassung |
| We present a method for reconstructing global ocean bathymetry that combines
a standard plate cooling model for the oceanic lithosphere based on the age
of the oceanic crust, global oceanic sediment thicknesses, plus generalized
shelf-slope-rise structures calibrated at modern active and passive
continental margins. Our motivation is to develop a methodology for
reconstructing ocean bathymetry in the geologic past that includes
heterogeneous continental margins in addition to abyssal ocean floor. First,
the plate cooling model is applied to maps of ocean crustal age to calculate
depth to basement. To the depth to basement we add an isostatically
adjusted, multicomponent sediment layer constrained by sediment thickness
in the modern oceans and marginal seas. A three-parameter continental
shelf-slope-rise structure completes the bathymetry reconstruction,
extending from the ocean crust to the coastlines. Parameters of the
shelf-slope-rise structures at active and passive margins are determined
from modern ocean bathymetry at locations where a complete history of
seafloor spreading is preserved. This includes the coastal regions of the
North, South, and central Atlantic, the Southern Ocean between
Australia and Antarctica, and the Pacific Ocean off the west coast of South
America. The final products are global maps at 0.1° × 0.1° resolution of depth to basement, ocean bathymetry with an
isostatically adjusted multicomponent sediment layer, and ocean bathymetry
with reconstructed continental shelf-slope-rise structures. Our
reconstructed bathymetry agrees with the measured ETOPO1 bathymetry at most
passive margins, including the east coast of North America, north coast of
the Arabian Sea, and northeast and southeast coasts of South America. There
is disagreement at margins with anomalous continental shelf-slope-rise
structures, such as around the Arctic Ocean, the Falkland Islands, and
Indonesia. |
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