Earth Science (15th Edition)
Earth Science (15th Edition)
15th Edition
ISBN: 9780134543536
Author: Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher: PEARSON
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Chapter 15, Problem 1GST
To determine

The explanation for the surface current shown in the map which does not coincide with the prevailing wind current.

Expert Solution & Answer
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Answer to Problem 1GST

The surface current shown in the map does not coincide with the prevailing wind current at the African coast because they may be influenced by the coastal upwelling and coriolis force which operates in the other direction.

Explanation of Solution

The atmosphere and ocean, meet at the surface of the ocean. Here, the energy passes from the atmospheric air medium to the water surface with friction. The wind exerts drag which bows steadily across the oceans. This results in the surface layer of water to move.

The rotation of the Earth which results in the deflection of oceanic currents to the right in the northern hemisphere and to the left in the southern hemisphere is termed as Coriolis Effect. This is one of the major factors that influence the ocean circulation.

Coastal upwelling is the rise of cold water from the deeper layers replacing the warmer surface water. This is common in west coasts of continents and is operated by wind. Hence, the surface currents although operated by the ocean currents, are affected by the Coriolis Effect and upwelling of water.

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