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Friday, October 16, 2020 | History

2 edition of Low frequency variations in the sea level and currents over the Oregon continental shelf found in the catalog.

Low frequency variations in the sea level and currents over the Oregon continental shelf

David L. Cutchin

Low frequency variations in the sea level and currents over the Oregon continental shelf

by David L. Cutchin

  • 181 Want to read
  • 39 Currently reading

Published .
Written in English

    Subjects:
  • Continental shelf -- Oregon.,
  • Ocean currents -- North Pacific Ocean.,
  • Sea level -- Oregon.

  • Edition Notes

    Statementby David Louis Cutchin.
    The Physical Object
    Pagination[13], 122 leaves, bound :
    Number of Pages122
    ID Numbers
    Open LibraryOL15520085M

    Low energy is found offshore and nearshore. The highest energy is found near a small seamount. High energy is found over the rough topography of Heceta Bank and near the shelf break. The highest energy occurs as packets of high-frequency waves, often occurring on the sharp downward phase of the M 2 internal tide and called “tidal solibores Cited by: shelf was westerly. with mean currents highest at the shelf break and decreasing toward the coastline. Mean current speeds near the shelf break were about 15 cm s-1 in winter and decreased to about 5 cm s-1during summer. These seasonal variations were due primarily to variations in intensity of the wind-stress-driven Gulf of Alaska subarctic gyre.

    WINTER CIRCULATION AND HYDROGRAPHY OVER THE CONTINENTAL SHELF OF THE NORTHWEST GULF OF ALASKA1 J. D. Schumacher, R. Sillcox/D. Dreves,3 and R. D. Muench Pacific Marine Environmental Laboratory ABSTRACT. During winter temperatures and salinity were measured in the shelf region east of Kodiak Island and in the Shelikof Strait. The Gulf Stream begins upstream of Cape Hatteras, where the Florida Current ceases to follow the continental shelf. The position of the Stream as it leaves the coast changes throughout the year. In the fall, it shifts north, while in the winter and early spring it shifts south (Auer ; Kelly and Gille ; Frankignoul et al. ).

    Analyses of current time series longer than days from 33 sites over the Middle Atlantic Bight continental shelf reveal a consistent mean circulation pattern. The mean depth-averaged flow is equator-ward, alongshelf, and increases with increasing water depth from 3 cm s1 at the m isobath to 10 cm s at the m isobath. The mean cross File Size: 1MB. continental-shelf waves Vorticity waves produced in a continental-shelf area where there is a sea-bed slope. In the northern hemisphere, if a water column is displaced into shallower water it develops negative relative vorticity, or anticyclonic motion; if displaced into deeper water it will develop positive relative vorticity, or cyclonic motion.


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Low frequency variations in the sea level and currents over the Oregon continental shelf by David L. Cutchin Download PDF EPUB FB2

Sea level variations and currents on the Oregon continental shelf exhibit wavelike characteristics in a frequency band from approximately to cycle per day (cpd). Current observations over three isobaths (50,and m) on the Oregon continental shelf are available for winter and spring and summer In each season there are low‐frequency current fluctuations with periods of several days, predominantly alongshore, that are correlated with the along‐shore wind stress and sea level at by: A continental shelf is a portion of a continent that is submerged under an area of relatively shallow water known as a shelf sea.

Much of these shelves has been exposed during glacial periods and interglacial shelf surrounding an island is known as an insular shelf.

The continental margin, between the continental shelf and the abyssal plain, comprises a steep continental. Heceta Bank is a rocky bank located 55 kilometers (km) off the Oregon coast near Florence, centered on approximately 44°N, °W, and is roughly 29 km long and upwards of 13 km wide.

Heceta Bank is an area of ecological and oceanographic importance. The unique bathymetric features and seasonal circulation within the bank provides habitat for a diversity of.

over the continental shelf off Oregod Adrianu Huyer School of Oceanography, Oregon State University, Corvallis Abstract Seasonal variations in the hydrography of the waters over the continental shelf off Ore- gon were observed in a set of hydrographic data collected along 44”39’N at Cited by: Fluctuations in the Skagerrak of period 5 days or more are analysed.

Two distinct frequency bands are identified by coherence and phase analysis. In Cited by: 1. [1] Low-frequency variability in global mean sea level (GMSL) is studied for the period – by interpolating sparse tide gauge data to a global grid using empirical orthogonal functions (EOFs) of sea level variability determined from TOPEX/Poseidon (T/P) altimeter data.

I35 CHAPTER 4 OBSERVATIONS OF TIDES OVER THE CONTINENTAL SHELF OF NORTH-WEST EUROPE M.J. HOWARTH AND D.T. PUGH INTRODUCTION The aim of this chapter is to describe the observation, analysis, synthesis and presentation of the tidal movements of the waters of the North-West European Shelf by: an analysis is presented of the low-frequency fluctuations (w% cycle per day %cpd.

Steric sea level also slopes downward from the coast in winter, and upward in summer. Alongshore geostrophic flow is southward in summer and northward in winter. The variations in temperature, salinity, and sigma-t are caused by seasonal cycles in the surface heat balance, precipitation and runoff, the local wind, and the alongshore flow.

1. Introduction [2] The record of sea level from tide gauges over the past 70– years clearly shows a rise in the sampled mean sea level at a rate of between 1 and 2 mm yr −1 [e.g., Church et al., ; Douglas, ].Although the tide gauge record is long at some sites, it does not represent a homogeneous sample of the global oceans.

Most gauges with long Cited by: OCEANOGRAPHY OF THE NORTHWEST ATLANTIC CONTINENTAL SHELF The large scale physical oceanography of the Northwest Atlantic continental shelf region has been reviewed by Loder et al. The main features are greatly influenced by dynamics of the North Atlantic subpolar and subtropical gyres, which meet off the Grand Banks of Newfoundland.

ever, this article will focus on global changes in sea level. Thus, the variations in sea level must be due to one of two possibilities: (1) changes in the vol-ume of water in the oceans or (2) changes in the volume of the ocean basins.

Sea Level Change due to Volume of Water in the Ocean Basin The two main reservoirs of water on Earth are the.

Measures small variations in elevation of surface water. Three major provinces. Continental margins deep-ocean basins the transition between the continental shelf and the deep-ocean floor.

below sea level. submarine canyons. form at the junction between continental shelf and continental slope. turbidity currents. Start studying Marine Zonation. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

The shallow region of the ocean overlying the continental shelf. Shelf. an underwater landmass which extends from a continent, resulting in an area of relatively shallow water known as a shelf sea. Photic Zone.

The narrow top. Despite the large near-N peak in vertical kinetic energy, the internal-wave energy on the Oregon shelf, as almost everywhere, is dominated by low-frequency waves. The strongest component is the M 2 internal tide with about 18 m J kg −1 (Fig. 3).Cited by: OCEAN CURRENTS ABOVE THE CONTINENTAL SHELF OFF OREGON AS MEASURED WITH A SINGLE ARRAY OF CURRENT METERS [Curtis A & Pattullo, June G Collins] on *FREE* shipping on qualifying : Collins, Curtis A & Pattullo, June G.

J.M. Huthnance, in Encyclopedia of Ocean Sciences (Second Edition), Introduction. Many shelf seas are dominated by shelf-wide motions that vary from day to day. Oceanic tides contribute large coastal sea-level variations and (on broad shelves) large currents.

Atmospheric pressure and (especially) winds generate storm surges; strong currents and large changes of. Water Circulation and Dispersal Mechanisms. Authors; Authors and affiliations; G.

Csanady Continental shelf waves: Low frequency variations in sea level and currents over the Oregon continental shelf.

Phys. Oceanogr., 3: 73– CrossRef Google Robinson, A. () Continental Shelf Waves and the response of sea level to Cited by: Low-frequency western Pacific Ocean sea level and circulation changes due to the connectivity of the Philippine Archipelago Wei Zhuang,1 Bo Qiu,2 and Yan Du1 focus of the present study is on the low-frequency sea level variations, the original weekly data from October to.

Search the history of over billion web pages on the Internet. search Search the Wayback Machine. Featured texts All Books All Texts latest This Just In Smithsonian Libraries FEDLINK (US) Genealogy Lincoln Collection. National Emergency .Steric sea level also slopes downward from the coast in winter, and upward in summer.

Alongshore geostrophic flow is southward in summer and northward in winter. The variations in temperature, salinity, and sigma‐ t are caused by seasonal cycles in the surface heat balance, precipitation and runoff, the local wind, and the alongshore by: not a situation normally encountered in the deep sea.

2 Coastal Waves and Transient Currents The coastal region is a low-frequency waveguide (as is the equatorial region; Chap.

5) because of its side boundary which supports a coastal Kelvin wave mode and because of its cross-shore topo-graphic slope which supports a topographic Rossby wave Size: 7MB.