New PDF release: Descriptive Physical Oceanography. An Introduction

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By G L Pickard and W. J. Emery (Auth.)

ISBN-10: 0080379524

ISBN-13: 9780080379524

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The oceanographer perhaps has one advantage over the detective. He can sometimes go back to m a k e more observations, whereas the criminal may not be so obliging as to keep repeating his crime. There is one more dimension to be considered. In addition to the spatial variations of properties (vertical and horizontal) there may be variations with time ("temporal" variations). e. anchors for a day, a week or longer, or else returns to the same station, time after time, to measure the water properties there.

This appears to present a discrepancy but it must be noted that the time scales of the two mechanisms are quite different. The LCs are generated within minutes of the wind starting but the E k m a n circulation takes many hours to develop. 24 Temporal variations of temperature in the upper layer The temperature in the upper zone shows seasonal variations, particularly in middle latitudes. The layer between the surface and a depth of 25 to 200 m is usually at much the same temperature as the surface water because of mixing due to wind waves.

The distinction between "equatorial" and "tropical" should be noted as it is often significant; when the two are to be lumped together the term "low latitude" will be used, in contrast to the "high latitudes" which are near the poles, north and south. "Subtropical" refers to zones on the high latitude side of the tropical zones. The term "polar" is properly applied to oceanography only to the Arctic regions but is often used of the ocean close to Antarctica. 21 Surface temperature The distribution of temperature at the surface of the open ocean is approximately zonal, the lines of constant temperature (isotherms) running roughly east-west (Figs.

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Descriptive Physical Oceanography. An Introduction by G L Pickard and W. J. Emery (Auth.)

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