Accession Number : ADA305821

Title :   Subtidal Cross-Shelf Circulation on the Northern California Shelf.

Descriptive Note : Doctoral thesis,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s) : Dever, Edward P.

PDF Url : ADA305821

Report Date : JUN 1995

Pagination or Media Count : 162

Abstract : Moored time series from the Coastal Ocean Dynamics Experiment (CODE), Shelf Mixed Layer Experiment (SMILE), Sediment Transport Events over the Shelf and Slope (STRESS) study, and Northern California Coastal Circulation Study (NCCCS) are used to study subtidal cross-shelf circulation over the northern California shelf. The northern California shelf, like much of the United States Pacific coast, is subject to strong wind forcing which exhibits characteristic seasonality. In winter and early spring, it is distinguished by poleward and equatorward fluctuations on time scales of days and by weak monthly means. In summer, it is distinguished by periods of equatorward stress lasting several weeks and by relatively strong monthly means. The intensive winter and spring SMILE and STRESS and summer CODE-2 field programs permit the examination of cross-shelf circulation under both types of wind forcing conditions at a mid-shelf site (approx. 90 m) 6 km from the northern California coast. The primary thesis goal is to examine the applicability of a two-dimensional conceptual model of wind-forced cross-shelf circulation. In this conceptual model, surface and bottom cross-shelf flows are forced by along-shelf wind stress and bottom stress, and interior cross-shelf flow compensates such that the depth-averaged flow is zero. A secondary thesis goal is to use the seasonal coverage of available field programs to gain insight into seasonal variability of cross-shelf circulation on the northern California shelf. To accomplish these goals, the observed subtidal cross-shelf circulation is examined in the context of the winter and spring heat and salt balances, an analytic model of wind-forced cross-shelf circulation, and the spatial scales of subtidal velocity. (MM)

Descriptors :   *OCEAN CURRENTS, *CONTINENTAL SHELVES, MATHEMATICAL MODELS, SPATIAL DISTRIBUTION, COASTAL REGIONS, THESES, SEDIMENT TRANSPORT, SEASONAL VARIATIONS, CALIFORNIA, PACIFIC OCEAN, MIXED LAYER(MARINE), SALINITY, AIR WATER INTERACTIONS, HEAT FLUX, HEAT BALANCE, WIND STRESS, BOUNDARY LAYER FLOW, UPWELLING, OCEAN TIDES, MOORING.

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE