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西北太平洋副热带逆流,北赤道流,北赤道逆流几个特征的比较 预览 被引量:14

A Comparison of Characteristics between the Subtropical Countercurrent, the North Equatorial Current and the North Equatorial Countercurrent in the Northwestern Pacific Ocean
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摘要 根据137°E断面1967~1995年冬、夏季的温、盐资料,计算和分析该断面的地转流;分析144°E断面上投放卫星跟踪漂流浮标的漂移轨迹;结合CSK图集中的海面重力热分布,对副热带逆流、北赤道流和北赤道逆流几个特征的相同点和不同点进行比较,得出若干有益的结论:(1)副热带逆流、北赤道流、北赤道逆流,并不是单纯的单支海流,而是存在着两支或多支现象;(2)流速结构的带状分布,东、西向流相互交错间隔出现 According to the geostrophic current calculated from the hydrographic data of temperature and salinity at section 137°E during the winters and summers of 1967~1995, the drift trajectories of drifting buoies which were deployed at 144°E observed by satellites and together with the distributions of surface geopotential anomaly obtained from CSK Atlas, a comparison of the similarities and dissimilarities of the characteristics between the Subtropical Countercurrent (SCC), the North Equatorial Current (NEC) and North Equatorial Countercurrent (NECC) in the Northwestern Pacific Ocean is made in this paper.The main results are concluded as follows: (1) The SCC, NEC and ENCC have the features of multi branch. (2) They all appear at the surface or subsurface with banded current structure, and the eastward and westward currents occurring alternatively. (3) In regard to annual mean velocity of these three currents, the NECC is the strongest current, the NEC is the next one and the SCC is the weakest one. However, the variations of their volume transports are quite different. The largest one is the NEC, the next one is the NECC and the smallest one is SCC. The current speed of three currents in summer is highev than that in winter, but the variations of their volume transports are little bit different, the volume transports of the SCC and the NEC are strong and weak in summer and in winter, respectively; those of the NECC are opposite. (4) During winter, the original area of the SCC is located at Bazel strait and near the center of 'Warm Ridge' of the subtropical ridge east of Taiwan Island. (5) The drift trajectories of satellite drifting buoies in winter basically show the paths of the NEC and the NECC, however, it is difficult to demonstrate the path of the SCC in the area where eddies occurred frequently
作者 孙湘平 SUN Xiangping (First Institute of Oceanography, SOA, Qingdao 266003,China) (Key Laboratory of Marine Science and Numerical Modeling, SOA,Qingdao 266003,China)
出处 《黄渤海海洋》 CSCD 2000年第1期 1-12,共12页 Journal of Oceanography of Huanghai & Bohai Seas
关键词 副热带逆流 北赤道流 北赤道逆流 海流 太平洋 Subtropical Countercurrent North Equatorial Current North Equatorial Countercurrent Multi subbranching Banded structure
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