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Your search keyword '"Culver, Stephen J."' showing total 137 results
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137 results on '"Culver, Stephen J."'

31. Society Records and Activities

Author

Wolberg, Donald L., Flynn, John J., McKenna, Malcolm C., Buzas, Martin A., Culver, Stephen J., Schwimmer, David R., Case, Gerard R., Suczek, Christopher A., and Hansen, Thor A.

Published
1993

39. Timing and magnitude of recent accelerated sea-level rise (North Carolina, United States)

Author

Kemp, Andrew C., Horton, Benjamin P., Culver, Stephen J., Corbett, D. Reide, van de Plassche, Orson, Gehrels, W. Roland, Douglas, Bruce C., and Parnell, Andrew C.

Subjects
North Carolina -- Natural history, Sea level -- Measurement, Submarine geology -- Research, Earth sciences
Abstract

We provide records of relative sea level since A.D. 1500 from two salt marshes in North Carolina to complement existing tide-gauge records and to determine when recent rates of accelerated sea-level rise commenced. Reconstructions were developed using foraminiferabased transfer functions and composite chronologies, which were validated against regional twentieth century tide-gauge records. The measured rate of relative sea-level rise in North Carolina during the twentieth century was 3.0-3.3 mm/a, consisting of a background rate of ~1 mm/a, plus an abrupt increase of 2.2 mm/a, which began between A.D. 1879 and 1915. This acceleration is broadly synchronous with other studies from the Atlantic coast. The magnitude of the acceleration at both sites is larger than at sites farther north along the U.S. and Canadian Atlantic coast and may be indicative of a latitudinal trend. doi: 10.1130/G30352A.1

Published
2009

45. Global latitudinal species diversity gradient in deep-sea benthic foraminifera

Author

Culver,Stephen J. and Buzas, Martin

Subjects
Atlantic Ocean -- Research, Oceanographic research -- Analysis, Foraminifera -- Research, Earth sciences
Abstract

The authors discuss patterns of species diversity in deep-sea benthic foraminifera. Data from five locations in the Atlantic Ocean were used in the analysis.

Published
2000

49. Geographic origin of species: the temperate-tropical interchange

Author

Buzas, Martin A. and Culver, Stephen J.

Subjects
North America -- Natural history, Atlantic Ocean -- Natural history, Tropics -- Research, Paleobiogeography -- Research, Earth sciences
Abstract

The tropics are often evoked as a center for species origination. Foraminifera are one of the few groups of organisms with a fossil record sufficient to establish the geographic origin of species. The modern foraminiferal biota on the Atlantic continental margin of North America contains 259 species with a fossil record. The worldwide geographic origin of these species was documented using museum collections. Only 14% of these species originated in the subpolar regions, whereas nearly equal proportions originated in the temperate regions (46%) and tropical regions (40%). Moreover, the majority (76%) of species originating in the temperate regions now also occur in the modern tropical biota. These foraminiferal data suggest that, in contrast to the center of origin hypothesis, the biota of temperate and tropical latitudes act in concert with a substantial species interchange between them.

Published
2009

50. Estuarine Responses to Long‐Term Changes in Inlets, Morphology, and Sea Level Rise.

Author

Mulligan, Ryan P., Mallinson, David J., Clunies, Gregory J., Rey, Alexander, Culver, Stephen J., Zaremba, Nick, Leorri, Eduardo, and Mitra, Siddhartha

Subjects
SEA level, OCEANOGRAPHY, ESTUARINE ecology, GEOMORPHOLOGY, SEDIMENTATION & deposition
Abstract

Pamlico Sound, a large back‐barrier estuary in North Carolina, is under threat of climate change due to increased storm activity and sea level rise. The response of this system is investigated by considering what has already happened during changes in sea level over the late Holocene epoch. The hydrodynamic changes that occurred in response to geomorphic evolution are simulated using a 3‐D numerical model for four distinct "time‐slice" scenarios. To accomplish this, the present‐day bathymetry was obtained from a high‐resolution digital elevation model, and paleobathymetric grids were developed from sediment cores and seismic observations. Using the same hydrodynamic forcing for each geomorphic scenario, the models are compared to assess the combined response to: different inlets connecting the back‐barrier estuary to the ocean, changes in basin geomorphology due to sedimentation, and sea level rise. The results indicate that these factors have a considerable effect on hydrodynamics, waves, and salinity in the estuary. The time‐averaged tidal ranges were up to 3 times as high for the past environments in comparison with present‐day water level elevations, and maximum current velocities were over 3 times higher in regions close to paleo‐inlets. The simulations for each time slice suggest that the salinity distribution in Pamlico Sound is strongly influenced by the hydraulic connectivity with other estuaries and the number and size of tidal inlets through the barrier island system. The results indicate that changes to barrier systems induce strong, nonuniform, and complex responses in back‐barrier estuaries with regime shifts in hydrodynamic energy and water mass properties. Key Points: A modeling approach is developed for simulating the response of an estuary to different geomorphological conditions over a long time scaleGeological observations were used to define inlet locations, basin morphology, and sea levels in the hydrodynamic modelThe results indicate controls on the water levels, current velocities, and salinity distributions in paleo‐estuarine environments [ABSTRACT FROM AUTHOR]

Published
2019
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