Cape Hatteras

Surface water enrichment is the result of aeolian and fluvial inputs, which are thought to be the most important sources of Th to the ocean. Thorinm-232 has been proposed as a link between the radiogenic thorium isotopes and trace metals and anthropogenic pollutants. " While the pathways are very different for the radiogenic thorium isotopes, Th is delivered to the ocean in a fashion similar to many pollutants and trace metals. For example, Guo et found Th distributions in the Gulf of Mexico and off Cape Hatteras in the North Atlantic Ocean agreed well with the general distribution pattern of aluminum. 

Green MA. Aller RC, Cochran JK, Lee C, Aller JY (2002). Bioturbation in shelf/slope sediments off Cape Hatteras, North Carolina The use of " Th, Chl-a, and Br to evaluate rates of particle and solute transport. Deep-Sea Res 1149(20) 4627-4644... 

Guo LD, Santschi PH, Baskaran M, Zindler A (1995) distribution of dissolved and particulate °Th and Th in seawater from the Gulf of Mexico and off Cape Hatteras as measured by SIMS. Earth Planet Sci Lett 133 117-128... 

On variability timescales of 7-12 years (approximately decadal) no regular oscillations coherent globally have been detected. In the northern Atlantic, 13 to 15-year and 90-year oscillations have been manifested. Near Cape Hatteras, interdecadal oscillations have propagated along the Gulf Stream to the northern Atlantic... 

Bailey, T. G., Youngbluth, M. J., and Owen, G. P. (1995). Chemical composition and metabolic rates of gelatinous zooplankton from midwater and benthic boundary layer environments off Cape Hatteras, North Carolina, USA. Mar. Ecol. Prog. Ser. 122, 121—134. 

Cape Hatteras, NC Calvert County, VT Orange County, VT Jefferson County, NY Clarion County, PA... 

With eustatic sea level transgression and flooding of continental lowlands, transport of terrigenous organic matter into the North American basin may have increased. Analyses of Upper Cretaceous sediments from DSDP Site 6O3B, lower continental rise east of Cape Hatteras, indicate that, the organic matter was continentally derived. d C values of -23.5 to 27.1°/oo, C/N ratios of 32 to 72, and lipid class maxima of unbound alkanes (C-. and Cp-), unbound fatty acids (C and C2g) and bound fatty acids (C-g. 

Grow, J.A, Dillon, W.P, and Sheridan, R.F., 1977. Diapirs along the continental slope off Cape Hatteras. Soc. Explor. Geol. 47th Annu. Int. Meet., Calgary, Alta., Alberta Program, p. 51 (abstract). 

The model-predicted average denitrification rate for continental shelf sediments in the North Atlantic Basin is 0.69 mmol N as N2 per m /day. Denitrification rates (per unit area) are highest for the continental shelf region in the western North Atlantic between Cape Hatteras and South Florida and lowest for Hudson Bay, the Baffin Island region, and Greenland (Figure 21). 

The SSSB is deployed in the Atlantic Ocean approximately 40 km northeast of Cape Hatteras (Case 1413) at 35° 26.16 N, 75° 2.90 W and retrieved at 35° 24 N, 75° 4 W. The data collection period is from 13 59 29.14 (t = 0) to 16 09 22.03 (t =7783.15s) UTC. The data for the first 14 minutes or so are onboard the research vessel and not used. On this day, two long internal wave bands several kilometres long and approximately 2 to 4 kilometres apart are spotted on the water surface. The buoy is released into water at 14 13 UTC. The sky is partly cloudy. At 14 49 (t 3000 s) the ship is in a large dark cloudy area. The buoy records a sharp drop in the ambient light at t >2500 s. The dual surface slick bands are visible throughout the morning. The buoy obviously crosses one of them at t 3100 s when a dip of 0.1°C water temperatures is recorded (Fig. lb). Visual confirmation of this encounter is not available due to the large distance between the ship and the buoy. However, similar surface temperature drops (from Jim Edson s onboard met-sensor display) occur when ship crosses slick bands in a few other occasions. 

Marmorino GO, and Trump CL (1994) A salinity front and rip near Cape Hatteras, North Caroline. J Geophys Res 99 7627-7637 Marmorino, GO, Jansen RW, Valenzuela GR, Trump CL, Lee JS, and Kaiser JAC (1994) Gulf Stream surface convergence imaged by synthetic aperture radar. J Geophys Res 99 18,315-18,328... 

Live benthic foraminifera were collected from a 770 m site off the coast of Cape Hatteras, North Carolina and from a 220 m site on the Charleston Bump off the coast of South Carolina (R/V Cape Herdopen June 2001), and from a 1020 m site south of Cape Hatteras (R/V Oceanus April 2002). Bottom water samples for chemical analyses... 

Rullkotter, J., Mukhopadhyay, P.K. and Welte, D.H., 1987. Geochemistry and petrography of organic matter from Deep Sea Drilling Project Site 603, lower continental rise off Cape Hatteras. In van Hinte, J.E., Wise, S.E. Jr et al. (eds). Initial Reports DSDP, 92, US Government Printing Office, Washington DC, pp. 1163-1176. 

An example is shown in Fig. 35.6 based on the homly significant wave heights measured by the NDBC buoy seaward of Cape Hatteras, North Carolina the compiled data are for the winter months of November through the following March, the season when the waves have been generated by extratropical storms (Northeasters). In contrast to the decadal increase in the heights of summer waves... 

Fig. 35.7. Histograms for the hurricane waves measured by the Cape Hatteras buoy, comparing the numbers of occurrences from early in the record versus the recent decade, 1996-2005.

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