The Seasonal Variability of Continental Shelf Circulation in the Northern and Western Gulf of Mexico from a High-Resolution Numerical Model

2013 ◽  
pp. 203-218 ◽  
Author(s):  
Steven L. Morey ◽  
Jorge Zavala-Hidalgo ◽  
James J. O'Brien
Keyword(s):  
High Resolution ◽  
Numerical Model ◽  
Gulf Of Mexico ◽  
Continental Shelf ◽  
Seasonal Variability ◽  
Shelf Circulation

Fronts and shelf-circulation models

1981 ◽  
Vol 302 (1472) ◽  
pp. 597-604 ◽  
Keyword(s):  
Numerical Model ◽  
Numerical Modelling ◽  
Continental Shelf ◽  
Satellite Imagery ◽  
Three Dimensional ◽  
Shelf Circulation ◽  
Eddy Formation ◽  
Coastal Front

Satellite imagery shows that fronts and frontal eddies are widespread on the northwest European continental shelf. The implications for the numerical modelling of transports (for example, of pollutants) are discussed. A brief review of some models of shelf circulation is given. It is argued that to include fronts in models of shelf circulation requires a better understanding of dynamics on the frontal scale. A three-dimensional numerical model of eddy formation in a coastal front is then presented that reproduces many of the observed features.

Evaluation of archaeological site potential on the Gulf of Mexico continental shelf using high‐resolution seismic data

Geophysics ◽  
1986 ◽  
Vol 51 (3) ◽  
pp. 605-622 ◽  
Author(s):  
Melanie J. Stright
Keyword(s):  
High Resolution ◽  
Gulf Of Mexico ◽  
Continental Shelf ◽  
Gulf Coast ◽  
Sediment Cores ◽  
Archaeological Site ◽  
Archaeological Sites ◽  
Management Service ◽  
Seismic Reflection Data ◽  
Physical And Chemical

Prehistoric archaeological sites dating between 12 000 B.P. and 6 000 B.P. are expected on that portion of the Gulf of Mexico continental shelf which was subaerially exposed at 12 000 B.P. Although the archaeological sites are too small and their contrast to the surrounding sediments is insufficient to be resolved by high‐resolution seismic profilers, geomorphic features, such as fluvial channels, bays, lakes, etc., with which these sites are frequently associated are easily detected with seismic methods. High‐resolution seismic reflection data from the Gulf of Mexico have produced evidence of relict fluvial systems with well‐preserved terraces, point bars, and levee ridges, occurring within 9.0 m or less of the present seafloor. Regional studies which detail the late Pleistocene and Holocene geology of the Gulf of Mexico, and published sea level curves, indicate that these fluvial features date from the late Wisconsin and early Holocene periods when prehistoric man’s presence in the Gulf Coast Region is well documented. Verifying the presence of archaeological sites in association with these fluvial features will require physical and chemical analysis of sediment cores from each location. The Minerals Management Service is presently conducting an archaeological study designed to investigate relict fluvial features similar to those discussed in this paper. The physical and chemical analyses of the sedimentary cores collected during this study are presently incomplete; however, initial inspection of the cores indicates the presence of well‐preserved lithosomes. The preservation potential of any archaeological sites occurring within these lithosomes also would be excellent.

Isotopic characterization of lifetime movement by two demersal fishes from the northeastern Gulf of Mexico

2021 ◽  
Vol 657 ◽  
pp. 161-172
Author(s):  
JL Vecchio ◽  
JL Ostroff ◽  
EB Peebles
Keyword(s):  
Gulf Of Mexico ◽  
Continental Shelf ◽  
Life Histories ◽  
Linear Mixed Model ◽  
Trophic Position ◽  
Eye Lens ◽  
Outer Continental Shelf ◽  
Red Grouper ◽  
Lens Diameter ◽  
Isotopic Characterization

An understanding of lifetime trophic changes and ontogenetic habitat shifts is essential to the preservation of marine fish species. We used carbon and nitrogen stable isotope values (δ13C and δ15N) recorded within the laminar structure of fish eye lenses, reflecting both diet and location over time, to compare the lifetime trends of 2 demersal mesopredators. Tilefish Lopholatilus chamaeleonticeps inhabit burrows on the outer continental shelf, which results in exceptional site fidelity. Red grouper Epinephelus morio are spawned on the middle to outer continental shelf, move to the inner shelf for the juvenile period, and return offshore upon sexual maturity. Both species inhabit the eastern Gulf of Mexico, a region with a distinctive offshore-inshore gradient in background δ13C values. Within individual tilefish (n = 36), sequences of δ13C values and δ15N values had strong, positive correlations with eye-lens diameter, and strong correlations between the 2 isotopes (mean Spearman r = 0.86), reflecting an increase in trophic position with growth and little lifetime movement. In red grouper (n = 30), δ15N values positively correlated with eye-lens diameter, but correlations between δ15N and δ13C were weak (mean Spearman r = 0.29), suggesting cross-shelf ontogenetic movements. Linear mixed model results indicated strong relationships between δ15N and δ13C values in tilefish eye lenses but no convergence in the red grouper model. Collectively, these results are consistent with previously established differences in the life histories of the 2 species, demonstrating the potential utility of eye-lens isotope records, particularly for investigating the life histories of lesser-known species.

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