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Browsing by Author "Samelson, Roger M."
Now showing items 1-20 of 25
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Thum, Nicolai (2006-10-16)This thesis examines the mechanisms that couple the monthly-averaged atmospheric boundary layer (ABL) to open-ocean sea surface temperature (SST) perturbations on scales of 50-500 km. The observed positive correlation ...
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Bane, John M.; Levine, Murray D.; Samelson, Roger M.; Haines, S. M.; Meaux, M. F.; Perlin, Natalie; Kosro, P. Michael; Boyd, T. (American Geophysical Union, 2005-10-27)Meteorological conditions during an intensive oceanographic observational program in May through August 2001 along the central Oregon coast are described and related to larger-scale and longer-term conditions. Southwar ...
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Perlin, Natalie; Skyllingstad, Eric D.; Samelson, Roger M. (American Meteorological Society, 2011-03)The study analyzes atmospheric circulation around an idealized coastal cape during summertime upwelling-favorable wind conditions simulated by a mesoscale coupled ocean–atmosphere model. The domain resembles an eastern o ...
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Nuss, Wendell A.; Bane, John M.; Thompson, William T.; Holt, Teddy; Dorman, Clive E.; Ralph, F. Martin; Rotunno, Richard; Klemp, Joseph B.; Skamarock, William C.; Samelson, Roger M.; Rogerson, Audrey M.; Reason, Chris; Jackson, Peter (American Meteorological Society, 2000-04)Coastally trapped wind reversals along the U.S. west coast, which are often accompanied by a northward surge of fog or stratus, are an important warm—season forecast problem due to their impact on coastal maritime activi ...
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Dynamical Analysis of the Boundary Layer and Surface Wind Responses to Mesoscale SST Perturbations O’Neill, Larry W.; Esbensen, Steven K.; Thum, Nicolai; Samelson, Roger M.; Chelton, Dudley B. (American Meteorological Society, 2010-02)The dynamical response of the marine atmospheric boundary layer (MABL) to mesoscale sea surface temperature (SST) perturbations is investigated over the Agulhas Return Current during winter from a 1-month, high-resolutio ...
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Samelson, Roger M.; Agnew, T.; Melling, H.; Munchow, A. (American Geophysical Union, 2006-01-28)Satellite observations of ice motion are combined with model estimates of low-level winds and surface wind stress to provide evidence for atmospheric control of sea-ice motion through Nares Strait, between Ellesmere I ...
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Wilson, Gregory W. (2009-04-01)We investigate, theoretically and experimentally, the problem of modeling depth-integrated (2DH) surf zone circulation on an alongshore-nonuniform natural beach, with waves approaching from an arbitrary angle. An approxi ...
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Chelton, Dudley B.; Schlax, Michael C.; Samelson, Roger M.; de Szoeke, Roland A. (American Geophysical Union, 2007-08-09)Ten years of sea-surface height (SSH) fields constructed from the merged TOPEX/Poseidon (T/P) and ERS-1/2 altimeter datasets are analyzed to investigate mesoscale variability in the global ocean. The higher resolution of ...
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Samelson, Roger M.; Tziperman, Eli (American Meteorological Society, 2001-12)The local predictability of the El Nin˜o–Southern Oscillation (ENSO) is examined by the analysis of the evolution of small disturbances to an unstable 4.3-yr ENSO cycle in the Cane–Zebiak model forced by perpetual July ...
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Kuebel Cervantes, Brandy T.; Allen, John S.; Samelson, Roger M. (European Geosciences Union, 2004-02-25)The coastal ocean may experience periods of fluctuating along-shelf wind direction, causing shifts between upwelling and downwelling conditions with responses that are not symmetric. We seek to understand these asymme ...
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Samelson, Roger M. (European Geosciences Union, 2001)The dynamics of the growth of linear disturbances to a chaotic basic state is analyzed in an asymptotic model of weakly nonlinear, baroclinic wave-mean interaction. In this model, an ordinary differential equation for ...
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Durland, Theodore S.; Samelson, Roger M.; Chelton, Dudley B.; de Szoeke, Roland A. (American Meteorological Society, 2011-06)Previously unaddressed aspects of how equatorial currents affect long Rossby wave phase speeds are investigated using solutions of the shallow-water equations linearized about quasi-realistic currents. Modification of th ...
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Springer, S. R.; Samelson, Roger M.; Allen, John S.; Egbert, Gary D.; Kurapov, Alexander; Miller, Robert N.; Kindle, J. C. (American Geophysical Union, 2009-02-13)The Oregon Coastal Transition Zone (OCTZ) extends several hundred kilometers offshore where shelf flows interact with the northern California Current. A primitive-equation numerical ocean model is used to study the upw ...
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Wolfe, Christopher L.; Samelson, Roger M. (American Meteorological Society, 2006-11)The stability of a time-periodic baroclinic wave-mean oscillation in a high-dimensional two-layer quasigeostrophic spectral model is examined by computing a full set of time-dependent normal modes (Floquet vectors) for t ...
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Samelson, Roger M. (Cambridge University Press, 1999-03)An approach developed recently to study the dynamics of vorticity defects in homogeneous shear flow extends naturally to the case of baroclinic, quasi-geostrophic flow. It is shown that an inviscid geostrophic flow wit ...
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Perlin, Natalie; Skyllingstad, Eric D.; Samelson, Roger M.; Barbour, Philip L. (Journal of Physical Oceanography, 2007-08)Air–sea coupling during coastal upwelling was examined through idealized three-dimensional numerical simulations with a coupled atmosphere–ocean mesoscale model. Geometry, topography, and initial and boundary conditions ...
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Samelson, Roger M. (1987-10-02)
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Samelson, Roger M.; Allen, J. S. (American Meteorological Society, 1987-11)Observations of oppositely directed, monthly mean alongshore currents and wind stress over the continental margin off the Pacific coast of North America motivate the theoretical examination of mean flow generation by top ...
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Gaube, Peter (2012-11-02)The influence of mesoscale ocean eddies on near-surface ocean temperature, surface stress and phytoplankton communities is investigated by collocating numerous satellite measurements along with vertical profiles of ocean ...
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Samelson, Roger M.; de Szoeke, Roland A. (American Meteorological Society, 1988-10)We formulate analytically and solve numerically a semigeostrophic model for wind-driven thermocline upwelling at a coastal boundary. The model has a variable-density entraining mixed layer and two homogeneous interior la ...
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