Synoptic Variability of Flows Among the Factors in Reference to Conditions for Beluga Whale (Delphinapterus leucas) Occurrence and Distribution in the Laptev Sea
The synoptic variability of flows in general and particularly in the Laptev Sea is not studied well enough by now. Considering the subject of the study to be the synoptic scale volatility of flows in the Laptev Sea we take into account characteristic for the Laptev Sea water mass movements, describe...
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| Format: | Thesis |
| Language: | English |
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2011
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| Online Access: | https://oceanrep.geomar.de/id/eprint/27878/ https://oceanrep.geomar.de/id/eprint/27878/1/2011_Alexandrova-Alina_MSc-Thesis.pdf |
| Summary: | The synoptic variability of flows in general and particularly in the Laptev Sea is not studied well enough by now. Considering the subject of the study to be the synoptic scale volatility of flows in the Laptev Sea we take into account characteristic for the Laptev Sea water mass movements, described by the statistical characteristics and understand by the synoptic scale heterogeneities in oceanographic fields, having characteristic temporal and spatial scales with a range of several days to months, and from tens to thousands of kilometers respectively (Monin, 1972; Kamenkovich et al, 1987; Lappo and Gulev, 1990). A variability of the statistic characteristics of current oscillations are estimated and described. The main source of information about the sea currents nowadays are the data from long - time measurements of their velocity and direction in definite sites of the sea on different depth horizons on the mooring stations with the use of ADCP (i.e. full-scale data on currents). Still even ADCP stations have some shortcomings in data sampling. More than thirty years ago at a meeting devoted to finding new directions for Arctic biological oceanography, it was suggested that marine mammals might some day be used as "educated" oceanographic sampling platforms (Thomas J.Smith, 2001). They are "educated" because, through millions of years of evolution, they have developed the ability to find and consume such prey as the arctic cod, Boreogadus saida, keystone prey species (Paine, 1966) arctic species that to this day has largely eluded the efforts of scientists who have tried to study it (Welch et al., 1993). Cetaceans, especially beluga whale (Delphinapterus leucas), display numerous anatomic and physiologic adaptations to life in a dense, three-dimensional medium. An exploration of cetacean ways helps in understanding how habitat influences habits and how cetaceans select habitat and what determines their summer distribution (Wursig B., 1989). Beluga whales are known to perform seasonal migrations, although the ... |
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