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| ANALYSIS OF THE STRENGTH AND YEARLY VARIATIONS OP QINGDAO COLD WATER-MASSES |
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| Abstract: |
| In view of ocean thermodynamics, the author tried to combine three indexes, i. e. the lowest temperature, the area and the average temperature oi the all stations in the cold water sector, into one synthetic index for the relative intensity oi the cold water-masses. In this way, the consistency resulting from different single index may be overcome. According to the strength anomaly of the cold water-masses, yearly variations of the strength from 1960 to 1980 were analysed, and the results revealed the existence of 5-8 years periodicity for the strength of the cold water. Before 1973, yearly strength fluctuated much, but less there after. Therefore, in the 1960s and early 1970s, owing to the large difference of the strength for different years, the fishing periods and the fishing grounds of Shidao, Qingdao-Haiyang and Dalian-Qingdao-Shidao changed markedly yearly. In the middle and late 1970s, owing to the little variation of the strength of the cold water-masses, the fishing periods and fishing grounds between the two periods changed as well. |
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