Observations of nonlinear momentum fluxes over the inner continental shelf

Publication Date

1-1-2021

Document Type

Article

Publication Title

Journal of Marine Research

Volume

79

Issue

1

DOI

10.1357/002224021834614425

First Page

27

Last Page

66

Abstract

Nonlinear momentum fluxes over the inner continental shelf are examined using moored observations from multiple years at two different locations in the Middle Atlantic Bight. Inner shelf dynamics are often described in terms of a linear alongshore momentum balance, dominated by frictional stresses generated at the surface and bottom. In this study, observations over the North Carolina inner shelf show that the divergence of the cross-shelf flux of alongshore momentum is often substantial relative to the wind stress during periods of strong stratification. During upwelling at this location, offshore fluxes of alongshore momentum in the surface layer partially balance the wind stress and reduce the role of the bottom stress. During downwelling, onshore fluxes of alongshore momentum reinforce the wind stress and increase the role of bottom stress. Over the New England inner shelf, nonlinear terms have less of an impact in the momentum balance and exhibit different relationships with the wind forcing. Differences between locations and time periods are explained by variations in bottom slope, latitude, vertical shear and cross-shelf exchange. Over the New England inner shelf, where moored density data are available, variations in vertical shear are explained by a combination of thermal wind balance and wind stress. An implication of this study is that cross-shelf winds can potentially influence the alongshore momentum balance over the inner shelf, in contrast with deeper locations over the middle to outer shelf.

Funding Number

OCE-1433716

Funding Sponsor

National Science Foundation

Keywords

coastal dynamics, downwelling dynamics, inner shelf, momentum balance, momentum flux, nonlinear, thermal wind balance, upwelling dynamics

Department

Moss Landing Marine Laboratories

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