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| Titel |
A regional ocean circulation model for the mid-Cretaceous North Atlantic Basin: implications for black shale formation |
| VerfasserIn |
R. P. M. Topper, J. Trabucho Alexandre, E. Tuenter, P. Th. Meijer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 7, no. 1 ; Nr. 7, no. 1 (2011-03-21), S.277-297 |
| Datensatznummer |
250004411
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| Publikation (Nr.) |
 copernicus.org/cp-7-277-2011.pdf |
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| Zusammenfassung |
| High concentrations of organic matter accumulated in marine sediments during
Oceanic Anoxic Events (OAEs) in the Cretaceous. Model studies examining these
events invariably make use of global ocean circulation models. In this study,
a regional model for the North Atlantic Basin during OAE2 at the
Cenomanian-Turonian boundary has been developed. A first order check of the results
has been performed by comparison with the results of a recent global Cenomanian
CCSM3 run, from which boundary and initial conditions were obtained. The
regional model is able to maintain tracer patterns and to produce velocity
patterns similar to the global model. The sensitivity of the basin tracer and
circulation patterns to changes in the geometry of the connections with the
global ocean is examined with three experiments with different bathymetries
near the sponges. Different geometries turn out to have little effect on
tracer distribution, but do affect circulation and upwelling patterns. The
regional model is also used to test the hypothesis that ocean circulation may
have been behind the deposition of black shales during OAEs. Three scenarios are
tested which are thought to represent pre-OAE, OAE and post-OAE situations.
Model results confirm that Pacific intermediate inflow together with coastal
upwelling could have enhanced primary production during OAE2. A low sea level
in the pre-OAE scenario could have inhibited large scale black shale formation, as could have
the opening of the Equatorial Atlantic Seaway in the post-OAE scenario. |
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