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  • 1980-1984  (17)
  • 1
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    Eddy energy of the northwest Atlantic and Gulf of Mexico determined from GEOS 3 altimetry (1983)
    American Geophysical Union
    Details
    Publication Date: 1983-11-20
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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    PAPER CURRENT
  • 2
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    The potential of satellite-based radar altimeters (1984)
    American Geophysical Union
    Details
    Publication Date: 1984-01-01
    Print ISSN: 0096-3941
    Electronic ISSN: 2324-9250
    Topics: Geosciences
    Published by American Geophysical Union
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    PAPER CURRENT
  • 3
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    Regional mean sea surfaces based on GEOS-3 and SEASAT altimeter data (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Altimetric sea surfaces provide a basis for detailed analyses of the earth's gravity, crustal structure, and the oceanic surface circulation. Long-term mean surfaces have been computed for the Bering Sea, Northwest Atlantic Ocean, and Gulf of Mexico based on a combination of the entire SEASAT (three-month) and GEOS-3 (3.5-year) altimeter data sets. The number of available passes ranged from 558 in the gulf to 1396 in the Atlantic. The large amount of data in these areas, coupled with the incresed constraint provided by the combination of data from two orbital inclinations, has permited the accurate removal of the effects of radial ephemeris error through crossing arc adjustments. The precision of these regional mean sea surfaces is approximately 15 cm, with horizontal resolutions approaching 25 km.
    Keywords: OCEANOGRAPHY
    Type: Marine Geodesy (ISSN 0149-0419); 8; 1-4,
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    NASA TECHNICAL REPORTS
  • 4
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    Comparison data for Seasat altimetry in the western North Atlantic (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: (Previously announced in STAR as N81-19529)
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Journal of Geophysical Research; 87; Apr. 30
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Ocean mesoscale variability from repeat tracks of Geos-3 altimeter data (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Keywords: OCEANOGRAPHY
    Type: Journal of Geophysical Research; 86; Nov. 20
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Seasat altimeter observations of dynamic topography in the Gulf Stream region (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A straightforward approach to altimeter data analysis in the Gulf Stream system is presented, using a detailed geoid model to remove the gravitational component. The resulting sea surface height profiles compare remarkably well with independent oceanographic observations. Specific features such as cold rings, warm rings, and no anomaly regions are analyzed and it is shown that known positions of cyclonic and anticyclonic rings correspond with depressions and elevations, respectively, with amplitudes as large as 95 cm. The apparent fluctuation of the Gulf Stream is indicated by the results, as in the finding that on time scales of a few days, surface transport indicated by the sea surface height difference across the stream varied by nearly 30%
    Keywords: OCEANOGRAPHY
    Type: Journal of Geophysical Research; 86; Jan. 20
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Oceanic eddy variability measured by GEOS 3 altimeter crossover differences (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Eddy statistics of sea height variations associated with dynamic ocean currents, gathered by GEOS 3 altimetry (25 cm), are discussed. Time variable flow is noted to be measureable using altimeter height and orbit information by means of three techniques: collinear tracks, where rms variability can be determined for mesoscale phenomena measured along parallel tracks; mean surfaces, using a 3-dimensional mapping of the sea surface for an accurate representation of the surface undulations; and crossover differences, such as between data tracks from GEOS and Seasat which have reduced ephemeris error over scales of a few thousand km. Mesoscale energetics have been found suitable for tracing meandering ocean currents by the crossover method. Possible sources of error are considered, including altimeter noise, orbit error, short wavelength continental shelf tides, etc., and it is determined that observations of mesoscale sea height appear to be limited only by uncertainties in the altimetry, which for Seasat was 5 cm over 60% of the world's oceans.
    Keywords: OCEANOGRAPHY
    Type: EOS; 62; 10, 1; 1981
    Format: text
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  • 8
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    Global mesoscale variability from collinear tracks of SEASAT altimeter data (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Eight to nine sets of global collinear altimeter data with a cross-track grid spacing of approximately 900 km at the equator and 600 km at midlatitude have been obtained from the last 25 days of the 1978 SEASAT mission. Since the geoid is time-invariant, such observations can reveal sea surface height variability caused by dynamic ocean phenomena. Variations due to deep ocean mesoscale features are presently solved for by eliminating the longer wavelength deviations, yielding sea height profiles with an accuracy of a few cm, and a global variability map constructed from these data which reveal an exceptionally realistic perspective of mesoscale energetics. The dominance of exceedingly small variability over extensive regions of the oceans is noted. In both the Atlantic and the Pacific, the North Equatorial Current systems were clearly expressed as zonal bands of higher variability.
    Keywords: OCEANOGRAPHY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; May 20
    Format: text
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  • 9
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    A search for cold water rings (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: SAR imagery obtained by Seasat in the Sargasso Sea during 1978 is examined for cold ring signatures. One orbit on August 26 is thought to have imaged the edge of a cold ring, although the ring's position was not well known at the time. During another orbit on September 23, drifting buoy and expendable bathythermography data furnished conclusive evidence that the ring was centered directly in the SAR swath. Although some suggestive patterns are visible in the images, it is not clear that cold rings can be identified by SAR, even though dynamically similar features, such as the Gulf Stream and warm rings, can be accurately detected. The suggestion is made that cold rings may be imaged inadequately because of their lack of surface temperature gradient.
    Keywords: OCEANOGRAPHY
    Format: text
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  • 10
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    Structure and variability of the Alboran Sea frontal system (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A distinct oceanic front coinciding with the jet of incoming North Atlantic water, and an associated anticyclonic gyre in the western half of the basin, were observed during a ship and aircraft survey of the physical characteristics of the Alboran Sea in the western Mediterranean in October 1977. The front was confined to the upper 200 m and was a continuous feature, extending from the Strait of Gibraltar 500 km eastward to the prime meridian. It is noted that in ten days between two surveys, the center of the gyre shifted 50 km westward. This variability of the anticyclonic gyre may correspond to changes of North Atlantic inflow strength, as inferred by local wind and the average atmospheric pressure over the western Mediterranean.
    Keywords: OCEANOGRAPHY
    Type: Journal of Geophysical Research; 87; Jan. 20
    Format: text
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