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  • 1
    Online Resource
    Online Resource
    American Geophysical Union (AGU) ; 1989
    In:  Journal of Geophysical Research: Oceans Vol. 94, No. C12 ( 1989-12-15), p. 18057-18070
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 94, No. C12 ( 1989-12-15), p. 18057-18070
    Abstract: The distributions of δ 18 O, salinity, temperature, and nutrients have been used to quantify water sources to the Mackenzie shelf in the Beaufort Sea. Comparison of water mass analyses with satellite imagery confirms that the meteoric (runoff) water is associated with the Mackenzie plume. The seasonally variable surface layer for the shelf is viewed as cycling between a “reverse estuary” in winter, when the polar mixed layer (PML) is formed, and a positive estuary in summer when the shelf waters respond to freshwater inputs (runoff and ice melt). We infer a standing stock of 3.7 m fresh water at the end of summer 1986, of which 30% owes its origin to the melting of sea ice; our data coupled with river flow imply a freshwater flushing time for the Mackenzie shelf at about 150 days. To re‐form the PML during winter requires the removal of this seasonal fresh water through the combined processes of flushing and ice formation: once this fresh water has been removed, continued ice growth can produce “new” brine which would be observed as a deeper and saltier PML from the previous year. A simple geochemical model shows that autumn conditions (freshwater accumulation) and the rate of flushing are important controls on the potential of the shelf to produce “new” brine and that winter runoff, were it to distribute evenly across the shelf, is sufficient to inhibit brine production.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1989
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  • 2
    Online Resource
    Online Resource
    American Geophysical Union (AGU) ; 1961
    In:  Journal of Geophysical Research Vol. 66, No. 6 ( 1961), p. 1865-
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 66, No. 6 ( 1961), p. 1865-
    Type of Medium: Online Resource
    ISSN: 0148-0227
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1961
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  • 3
    Online Resource
    Online Resource
    American Geophysical Union (AGU) ; 1960
    In:  Journal of Geophysical Research Vol. 65, No. 7 ( 1960-07), p. 2173-2190
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 65, No. 7 ( 1960-07), p. 2173-2190
    Type of Medium: Online Resource
    ISSN: 0148-0227
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1960
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  • 4
    Online Resource
    Online Resource
    American Geophysical Union (AGU) ; 2015
    In:  Journal of Geophysical Research: Oceans Vol. 120, No. 12 ( 2015-12), p. 8364-8380
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 120, No. 12 ( 2015-12), p. 8364-8380
    Abstract: Background seepage contributes a steady surface flux of oil to the Gulf of Mexico The Deepwater Horizon discharge generated a dynamic surface slick of far greater size Response efforts coincided with decrease of floating volume, but increase in oil covered area
    Type of Medium: Online Resource
    ISSN: 2169-9275 , 2169-9291
    URL: Issue
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2015
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  • 5
    In: Reviews of Geophysics, American Geophysical Union (AGU), Vol. 51, No. 3 ( 2013-09), p. 450-483
    Type of Medium: Online Resource
    ISSN: 8755-1209 , 1944-9208
    URL: Issue
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2013
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  • 6
    Online Resource
    Online Resource
    American Geophysical Union (AGU) ; 1964
    In:  Reviews of Geophysics Vol. 2, No. 3 ( 1964-08), p. 467-541
    In: Reviews of Geophysics, American Geophysical Union (AGU), Vol. 2, No. 3 ( 1964-08), p. 467-541
    Abstract: The perturbing potential due to the tidal interaction between the earth, sun, and moon is obtained without restrictive assumptions on the internal constitution of the earth. The derived potential is used in Gauss's equations for the time rate of change of the eccentricity, semimajor axis, and inclination of the moon's orbit. The tidal forces perturb the elements describing the earth's motion about the sun by a negligibly small amount. The variation in the earth's angular momentum due to the solar and lunar tides is described by Euler's equations. It is assumed that the moment of inertia of the earth corresponds to that appropriate for a rotating fluid with the density distribution of the present earth. The rate of change of the moon's orbital elements is determined by the phase lag in the elastic component of the tidal bulge raised by the sun and moon. Astronomical data give a current value of the lag of the lunar tidal bulge of 2.16°. The present phase lag corresponds to a rate of increase of the semimajor axis of 3.2 cm yr −1 , a rate of decrease of the inclination of the moon's orbital plane of 9.35 × 10 −12 rad yr −1 , and a rate of increase in the eccentricity of 1.2 × 10 −10 yr −1 . The obliquity of the earth's equator to the ecliptic and the period of rotation are increasing at present, owing to the combined effects of the lunar and solar tides. The effects of the solar tides are small at present but become important in the future. Numerical integrations of the coupled Gauss‐Euler equations are used to describe both the past history and the future evolution of the earth‐moon system. If the moon traveled a circular orbit, a backward tracing of the history shows the moon approaching the earth, reaching a minimum distance of 2.72 present earth radii. During the time of closest approach, the inclination and obliquity change rapidly, with the moon's orbital plane passing over the pole and the moon's motion becoming retrograde. If the orbit is eccentric, the eccentricity increases rapidly at the time of close approach. The perigee height remains nearly constant, while the apogee increases without bounds over a time of about 1000 years. If the current phase lag remains constant, the time of closest approach is only 1.78 × 10 9 years ago. Thus, the current phase lag is not consistent with the hypothesis that the earth‐moon system has existed throughout geologic time. The rotational parameters of Mars, Venus, and Mercury are discussed in terms of the dynamical theory. The distribution of rotational angular momentum of the solar system is described, and it is proposed that the major planets and Mars have lost only a very small proportion of their initial rotational angular momentum. The observed dependence of rotational angular momentum on planetary mass yields an estimate of the initial rotational period of the earth of between 9 and 13 hours. The mechanisms by which the earth's rotational energy can be dissipated are reviewed. It is argued that the phase lag in the tides may have remained constant over geologic time or may have been somewhat larger. This conclusion raises the problem of the age of the earth‐moon system. Theories of the origin of the moon are discussed against the requirements imposed by dynamical considerations. It is concluded that the theories of the fission of the earth to form the moon must be discarded, because the moon, once placed in the equatorial orbit, would remain there. Dynamics places severe constraints on the initial conditions for either a capture origin or the development of a binary system. The theory of several initial moons is briefly described, as are the climatological and tectonic problems raised by the consideration of the past history of the earth‐moon system.
    Type of Medium: Online Resource
    ISSN: 8755-1209 , 1944-9208
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1964
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  • 7
    Online Resource
    Online Resource
    American Geophysical Union (AGU) ; 1980
    In:  Journal of Geophysical Research: Solid Earth Vol. 85, No. B7 ( 1980-07-10), p. 3670-3680
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 85, No. B7 ( 1980-07-10), p. 3670-3680
    Abstract: A near‐bottom magnetic survey was conducted over the Brunhes/Matuyama reversal boundary near the East Pacific Rise crest at 21° N. Magnetic measurements were made on a level plane approximately 200 m above the sea floor using the Marine Physical Laboratory's deep‐tow vehicle, with precise transponder navigation. Track density was high both parallel and perpendicular to the magnetic lineations in order to study fine scale deviations from two‐dimensionality. The magnetic field on a gridded map was inverted to obtain the crustal magnetization distribution (including the effects of topography) by extension of the Fourier technique of Parker and Huestis [1974]. Linearity of sources parallel to the spreading center was not assumed, nor was upward continuation necessary in this treatment. We found that the polarity transition boundary is extremely straight and sharp and is very close to two‐dimensional even on a scale of hundreds of meters. Deviations from two‐dimensionality, however, occur within the magnetized blocks away from the transition zone. The polarity transition width is narrow, only 1000 m to 1400 m throughout the study area. This suggests a zone of crustal emplacement which is only 600–1000 m wide at the spreading center, which is in excellent agreement with geologic observations in the area. Comparisons are made with a two‐dimensional treatment of the same data from profiles (i.e., assuming linearity of sources). These studies also document a long‐wavelength (≈ 60 km) sinuosity in the trend of the magnetic anomalies. This sinuosity is the result of offsets of the spreading center which are not transform faults but which involve a component of strike slip motion subparallel to the spreading center.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1980
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  • 8
    Online Resource
    Online Resource
    American Geophysical Union (AGU) ; 1959
    In:  Journal of Geophysical Research Vol. 64, No. 11 ( 1959-11), p. 1967-2000
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 64, No. 11 ( 1959-11), p. 1967-2000
    Type of Medium: Online Resource
    ISSN: 0148-0227
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1959
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  • 9
    Online Resource
    Online Resource
    American Geophysical Union (AGU) ; 1961
    In:  Journal of Geophysical Research Vol. 66, No. 11 ( 1961-11), p. 3639-3670
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 66, No. 11 ( 1961-11), p. 3639-3670
    Type of Medium: Online Resource
    ISSN: 0148-0227
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1961
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  • 10
    Online Resource
    Online Resource
    American Geophysical Union (AGU) ; 1961
    In:  Journal of Geophysical Research Vol. 66, No. 8 ( 1961-08), p. 2599-2599
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 66, No. 8 ( 1961-08), p. 2599-2599
    Type of Medium: Online Resource
    ISSN: 0148-0227
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1961
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