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Mean and time-dependent temperature and vorticity balances in the sub-tropical North AtlanticKeffer, Thomas 27 October 1980 (has links)
Graduation date: 1981
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Commensalism and Reproductive Biology of the Brittle Star Ophiocreas oedipus Associated with the Octoral Metallogorgia melanotrichos on the New England Corner Rise SeamountsMosher, Celeste V. January 2008 (has links) (PDF)
No description available.
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Observations of transient mantle convection in the North Atlantic OceanParnell-Turner, Ross Ernest January 2014 (has links)
No description available.
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Sedimentology and micropalaeontology of gravity cores from the N.E. Atlantic continental slope south west of IrelandBuck, P J January 1988 (has links)
Bibliography: pages 45-55. / Eleven gravity cores from the continental margin off Eire and Land's End (SW England) were examined and found to document the major trends of the Late Pleistocene climate. Several stratigraphic indicators; - carbonate content, sediment texture, grain size, composition, nature of terrigenous components, ice-rafted debris and foraminiferal diversity were examined and show that the glacial history of the study area can be closely correlated with the palaeoclimatic evolution of the adjacent European shelf. Sediments deposited during Late Pleistocene glacial conditions show the following characteristics when compared to the surface sediments deposited under Holocene interglacial conditions: an increase in the quantity of ice-rafted debris and percentage of mica, and a notable increase in the degree of frosting and pitting of the quartz grains. Overall grain size was finer resulting in a silty sediment package. Sedimentologically the cores fall into two groups (1 and 2). The major difference being that Group 1 (located on the Pendragon Escarpment) received increased quantities of fine silts from a 'shelf spill-over' mechanism operating on the Fastnet and Western Approaches Basins, during glacial regressions. All sediment samples displayed polymodal characteristics reflecting the interaction of several different physical processes e.g. ice-rafting, contour currents etc. Striking variations in the populations of planktonic foraminifera were noted, alternating between Arctic and Sub-Arctic assemblages, reflecting the waxing and waning of glacial activity. The coccolith-carbonate minima correlate with the Arctic-fauna maxima and the ¹⁸O/¹⁶O maxima of the oxygen-isotope curves. Foraminiferal-test analysis (ratio of whole foraminifera fragmented foraminifera) revealed that no correlation existed with any of the other parameters analysed. However, the cores were severely affected by the presence of bottom currents which were strong enough to remove the fragmented tests. Parallellaminated contourites and evidence of erosion were noted in all cores. Ten cores penetrated sediments deposited during the last glacial maximum of 20,000 B.P - 18,000 B.P. near the 75cm depth mark (Core 1865 was too short to reach such sediments). However sediments reflecting the 11,000 B.P glacial readvance, detected at around the 25cm mark, were not as clearly represented. Bioturbation has smoothed the climatic record throughout the lengths of these cores and has also suppressed the high-frequency oscillations (<10³ B.P).
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Studies of deep-sea sedimentary microtopography in the North Atlantic Ocean.Flood, Roger Donald January 1978 (has links)
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Science. / Microfiche copy available in Archives and Science. / Vita. / Bibliography: p. 333-347. / Ph.D.
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Observed circulation and inferred sediment transport in Hudson Submarine CanyonHotchkiss, Frances Luellen Stephenson January 1982 (has links)
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1982. / Microfiche copy available in Archives and Science / Vita. / Bibliography: leaves 217-223. / by Frances Luellen Stephenson Hotchkiss. / Ph.D.
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Bottom currents and abyssal sedimentation processes south of IcelandShor, Alexander Noble January 1980 (has links)
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1980. / Microfiche copy available in Archives and Science. / Bibliography: leaves 206-211. / by Alexander N. Shor. / Ph.D.
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Analysis of meteorological observations from an array of buoys during JASINIshida, Hiroshi 14 December 1979 (has links)
Observations of wind speed and direction, air and sea temperature,
and solar radiation were obtained from an array of buoys in
JASIN. The observations were analyzed to show spatial and temporal
variability. Spectra of wind speed and air and sea temperature were
computed to illustrate the distribution of variance over periods
ranging from 3.5 minutes to 40 days. When plotted on log-log graphs
the spectral estimates generally decrease with increasing frequency
with slopes between -3/2 and -2. Spectra of air and sea temperature
have a peak at the diurnal frequency. When plotted in variance-preserving
form, the spectrum of wind speed is consistent with a spectral
gap and is qualitatively similar to other observations of low
frequency spectra. On the basis of a cross-correlation analysis, it
appears that mesoscale eddies propagated with the mean wind speed
except during frontal passages. Based on the cross-correlation
between wind speed and air temperature, there is evidence of horizontal
roll vortices or organized convection. / Graduation date: 1980
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Morphology, sedimentary facies and processes of the northwest Atlantic mid-ocean channel between 61̊ and 52̊ N, Labrador SeaChough, Sung Kwun January 1978 (has links)
No description available.
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Marine epifaunal communities on test plates : Newfoundland to South CarolinaBuchanan, Robert A. January 1975 (has links)
No description available.
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