:Seasonal Variation of Circular Currents deduced from Water Temperature Distributions
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概要
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In order to examine the fluctuations of the circular currents in the north basin of Lake Biwa, successive observations of water temperature distributions using a bathythermograph were carried out from June to November, 1977. In every month, a series of measurements was made on five successive days so as to evaluate the effects of internal waves and winds on the distribution of water temperature. Assuming a geostrophic balance, velocity fields were estimated from the observed temperature fields.<BR>It has been found that (1) a large counterclockwise gyre was consistently maintained in the surface layer throughout the period of the observations; (2) there was also a virtually consistent clockwise gyre and another counterclockwise gyre was often visible in the south of a clockwise gyre; (3) internal waves and wind stresses had remarkable effects on the temperature distributions and seemingly caused a lateral movement of the gyre. It was also found that the available potential energy of the gyre was much larger than the kinetic energy, and the total energy showed a seasonal variation similar to that of the total accumulated heat in the lake.
- 日本陸水学会の論文
日本陸水学会 | 論文
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