Search Results

You are looking at 51 - 60 of 6,111 items for :

  • Waves, oceanic x
  • Journal of Physical Oceanography x
  • Refine by Access: Content accessible to me x
Clear All
Francesco Fedele and Felice Arena

1. Introduction Stochastic modeling of time series of the significant wave height H s recorded at a given ocean site is the principal focus of statistical methods employed in the long-term prediction of extreme wave events during sea storms ( Krogstad 1985 ; Prevosto et al. 2000 ; Boccotti 2000 ). The reviews of several methods used for this can be found in the work of Isaacson and Mackenzie (1981) , Guedes Soares (1989) , and Goda (1999) . In these methods, the effects of the sea state

Full access
Johanna H. Rosman and Gregory P. Gerbi

2001 ; Feddersen et al. 2007 ) by considering a more realistic turbulence spectrum that includes a rolloff at energy-containing scales. The general frozen turbulence approach is used to transform model turbulence κ spectra to ω spectra observed at a point when the turbulence is advected by waves and current. We systematically vary the current, wave properties, and turbulence properties across a wide parameter space that spans conditions in the coastal ocean, extending the work of Gerbi et al

Full access
Ziming Ke and Alexander E. Yankovsky

1. Introduction A full set of barotropic long waves trapped in the coastal ocean over a variable topography includes a zero (fundamental) mode that exists at both subinertial and superinertial frequencies and propagates with the coast on its right (left) in the Northern (Southern) Hemisphere (hereinafter, we refer to this direction as downstream) (e.g., Huthnance 1975 ). This zero mode resembles a Kelvin wave at lower, near- or subinertial frequencies and an edge wave (Stokes mode) at high

Full access
Lee-Lueng Fu

; Saraceno et al. 2004 ). In the center of the basin there is an intense anticyclonic gyre of barotropic circulation transporting water at a rate of 140 Sv (1 Sv ≡ 10 6 m 3 s −1 ) around the Zapiola Rise, a sediment ridge at the ocean’s bottom ( Saunders and King 1995 ; de Miranda et al. 1999 ). Superimposed on the gyre are rapidly rotating barotropic waves around the Zapiola Rise with a period close to 25 days ( Fu et al. 2001 ). These dynamical processes of wide-ranging spatial and temporal scales

Full access
Björn Carlsson, Yiannis Papadimitrakis, and Anna Rutgersson

1. Introduction The ocean–atmosphere momentum exchange is important for many atmospheric and oceanic processes. In wave and ocean modeling, as well as in atmospheric modeling, it is essential to model this exchange correctly. The momentum flux or the wind stress, τ , is governed by the roughness of the sea surface, which is usually described by the roughness length z 0 . Over land z 0 is determined by the form and height of more or less solid roughness elements. On the contrary, the sea

Full access
L. Zavala Sansón

1. Introduction This paper examines the properties of subinertial coastal-trapped waves in the ocean according to simple barotropic models. In the absence of stratification, these oscillations are mainly affected by both the earth’s rotation and the shape of the bottom topography. Subinertial topographic waves are also referred to as continental shelf waves, and they travel along the coast with shallow water to the right (left) in the Northern (Southern) Hemisphere. In this sense, the

Full access
James C. McWilliams, Edward Huckle, Junhong Liang, and Peter P. Sullivan

1. Introduction The wind blows and the waves rise and roll on. This is the regime of Langmuir turbulence in the oceanic surface boundary layer (BL), so-called because Langmuir circulations (often recognized by the windrows in the surfactants they cause) are the primary turbulent eddies whose vertical momentum and buoyancy fluxes maintain the mean ageostrophic current and density stratification. Langmuir circulations arise from the instability of wind-driven boundary layer shear in the presence

Full access
Juan M. Restrepo, Jorge M. Ramírez, James C. McWilliams, and Michael Banner

1. Introduction After the wind has been acting on the ocean surface for some time, the amplitude of the fastest growing wave component can reach a critical unstable steepness for which whitecapping occurs (for details and references see Banner and Peregrine 1993 ). We refer to the process of steepening, whitecapping, and changing amplitude as wave breaking. These short-lived, spatiotemporally random events reduce the excess energy in the wave field and modify the momentum of the background

Full access
Ramsey R. Harcourt and Eric A. D’Asaro

1. Introduction Exchanges of heat, water, momentum, and chemical species between the atmosphere and the ocean interior are mediated by mixing within the upper ocean boundary layer. This study seeks to quantify the role of surface waves in setting the level of turbulent kinetic energy (TKE) in this layer. This TKE level figures prominently in many ocean boundary layer models, including turbulence closure schemes of Mellor and Yamada (1982) and the K -profle parameterization (KPP; Large et al

Full access
Erik van Sebille and Peter Jan van Leeuwen

located in the southern Atlantic Ocean. The legitimacy of using such a model can be disputed, as waves and currents are not well represented, thereby strongly underestimating the advective transport of energy. This energy transfer through waves can, however, be an important factor in baroclinic processes such as the MOC (e.g., Saenko et al. 2002 ). The way in which perturbations can radiate energy through a basin was investigated by Johnson and Marshall (2002a , b ). In their high

Full access