Spelling suggestions: "subject:"north atlantic ocean"" "subject:"worth atlantic ocean""
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Fishing a Borderless Sea: Environmental Territorialism in the North Atlantic, 1818-1910Payne, Brian Joseph January 2006 (has links) (PDF)
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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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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The identification and characterisation of the North Atlantic Heinrich Events using environmental magnetic techniquesWadsworth, Emilie R. January 2006 (has links)
Heinrich Events (HEs) define intervals of major ice rafting from the Laurentide Ice Sheet (LIS) into the North Atlantic during that last glacial period. The discovery of potential European-sourced precursors to HEs suggest that the smaller, but climactically sensitive, European ice sheets (EIS) may have played a role in the triggering of HEs and their impact on global climates. Environmental magnetism has proved itself to be a useful, rapid and non-destructive tool in the identification and quantification of provenance in sediments from various depositional environments. In this work, environmental magnetic analyses are applied to marine sediment records from the European margin of the NE Atlantic and known to contain ice-rafted debris (IRD) from both LIS and EIS sources. The primary aim in the work of this thesis is to evaluate the methodology as a means of distinguishing IRD provenance. From the data obtained here it is possible to identify several magnetic events that correspond to the HEs and other layers of detrital material and which correlate well to previous standard petrological analyses performed on the same core materials. Magnetic signatures differ within the HEs, suggesting a changing balance of input from multiple sources as opposed to a single LIS source. The data suggest a phasing of these compositional differences through individual HEs. The potential of using environmental magnetic techniques in the identification of IRD provenance within marine sediments is discussed, as is the significance of the observed provenance variations within the cores studied.
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On Arctic and Atlantic halocline interactions in Baffin BayLobb, Julie. 10 April 2008 (has links)
No description available.
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Satellite monitored dive characteristics of the northern right whale, Eubalaena glacialisNieukirk, Sharon L. 07 December 1992 (has links)
The western North Atlantic population of the northern right whale (Eubalaena
glacialis) was severely depleted by whaling over the last century. Despite over fifty
years of protection, fewer than four hundred individuals are believed to exist in the
North Atlantic. Relatively little is known about the diving behavior, respiratory
physiology, or diel activity of these whales, although such information could be useful
in predicting population abundance and distribution in relation to food or
environmental variables. Dive behavior data can be collected visually, but collection
is limited to daylight hours, calm weather, and fortuitous encounters with study
animals. Satellite-monitored radio tags offer the opportunity to collect data on
individual whales' diving behavior continuously, over long distances and periods of
time, and at relatively low cost.
Thirteen North Atlantic right whales were tagged and monitored in the Gulf of
Maine between 1989 and 1991. One male was tagged in 1989; two adult males, six
adult females (two with calves) and one juvenile were tagged in 1990; one adult
female (with a calf) and two juveniles were tagged in 1991. The duration of
monitoring for the whales varied from <1 day to 43 days. Characteristics of the
radio tags were different over each year in order to evaluate different attachment
mechanisms and methods of collecting and summarizing data for dive duration, dive
frequency, and time submerged. These data were then used to describe the dive
behavior and to predict aspects of the respiratory physiology for these whales.
The number of dives, their duration, and the time submerged varied
considerably among individual whales and between years. Over all, the whales spent
79% of their time underwater. However, most dives were short (i.e., 95% were
<14 min; the mean dive duration was 92.3 sec), although dives of 30-40 min
duration were observed for several individuals. In general, the number of dives a
right whale made was inversely related to the average duration of its dives within a
time interval. Furthermore, over a given time interval, the number of times a whale
dove was a better predictor of the percent time it was submerged than was the
average duration of its dives.
There was no evidence of diel variation in dive behavior (i.e., number of
dives, average dive duration, or percent time submerged) among these whales. Age,
sex, and reproductive status may have affected dive behavior, although these trends
were not statistically significant due to the small number of study animals and
individual behavioral variability. Males tended to dive more often and averaged
shorter dives than females. Females with calves dove more often and averaged
shorter dives than females without calves. Juvenile females dove less often but
averaged longer dives than adult males or females with calves.
It was predicted that the aerobic dive limit of an "average" right whale was
approximately 14 min. Ninety-five percent of the dives recorded for the 11
monitored right whales were < 14 min. Furthermore, there was no evidence of
recuperative periods (i.e., prolonged periods at the surface) after long dives. These
observations were consistent with the idea that the North Atlantic right whales dove
within their aerobic scope. They further suggest that physiological parameters alone
probably have little influence on dive characteristics, except to set an upper limit on
the duration of a dive.
Satellite telemetry provides an opportunity to monitor the movements and
behavior of free-ranging animals, and overcome many of the short-comings associated
with traditional, human-based visual techniques for tracking and studying such
animals. Although the tags used in this study were prototypes and varied in their
design from year to year, several right whales were monitored simultaneously and
were tracked over thousands of kilometers. Advances in tag miniaturization,
attachment, and software will likely extend the time tags stay attached and the detail
of the behavioral and environmental variables that can be monitored. As testimony to
the power of this technology, this application of satellite telemetry to monitor great
whales yielded one of the most extensive, long-term, continuously-monitored data sets
yet recorded on the diving behavior of a baleen whale. / Graduation date: 1993
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Fishing the Borderlands: Government Policy and Fishermen on the North AtlanticPayne, Brian J. January 2001 (has links) (PDF)
No description available.
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Seasonal oscillations in a mid-latitude ocean with barriers to deep flow.Firing, Eric January 1978 (has links)
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Meteorology. / Microfiche copy available in Archives and Science. / Bibliography: p. 239-241. / Ph.D.
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Observations of interaction between the internal wavefield and low frequency flows in the North Atlantic.Ruddick, Barry Raymond January 1977 (has links)
Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Meteorology. / Microfiche copy available in Archives and Science. / Vita. / Bibliography : p. [323-328]. / Ph.D.
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Geology of the passive margin off New EnglandAustin, James Albert January 1979 (has links)
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1979. / Microfiche copy available in Archives and Science. / Vita. / Bibliography: leaves 163-184. / by James Albert Austin, Jr. / Ph.D.
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