Virginia Institute of Marine Science
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
Observationsa crosst he continentals helf offshoref rom New Jerseyi n late summer 1976s howa n intrusion of saline water at the mid level of the water column across the shelf edge front, which appears in density only as an offshore thickening of the pycnocline. This internal density field produces horizontal pressure gradient forces within the pycnocline in the onshore direction. These forces, in the linearized equationo f motion with a constante ddy viscosityd, rive a circulationw hich resemblesa double Ekman spiral for internal pressure vertical distributions which are thin with respect to the Ekman depth. For thick pressured istributionst, he circulationi s geostrophicT. he resultingf low pattern has no net crossshelf transport. For the continental shelf edge in the example, a northward geostrophic mid-level jet is predictedb y the theory. Ekman depth, and thus the vertical coefficiento f eddy viscosity,c an be determined from hydrographic data describing an intrusion.
New Jersey, Atlantic, Continental Shelf
Welch, Christopher S., "Mid‐level intrusions at the continental shelf edge" (1981). VIMS Articles. 296.