On the mechanism of seasonal variation of the Tsushima Warm Current
On the mechanism of seasonal variation of the Tsushima Warm Current
复制标题
对马暖流季节变化机制探讨
DOI：
10.1016/j.csr.2012.08.013
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发表时间：
2012-10-01
影响因子：
2.3
通讯作者：
Ju, Xia
中科院分区：
文献类型：
--
作者：
Ma, Chao;Wu, Dexing;Ju, Xia
观测结果表明，对马暖流（TSWC）在季节时间尺度上变化较大，夏季向北输送到日本/东海（JES）较强，冬季输送较弱。以往的研究表明，平均TSWC主要受公海上风应力的影响，而局地风应力的影响较小。然而，TSWC季节变化的强迫机制仍有待研究。采用三维海洋模式研究了局地强迫和远洋强迫对总swc季节变化的贡献。模式很好地模拟了观测到的季节周期，然后进行了三次额外的敏感性运行以隔离局部和公海强迫。结果表明，公海强迫和局地风应力都对西南偏南环流的季节循环有影响。公海强迫的影响通过黑潮与本州-九州群岛的相互作用而得到促进。KC输运在夏季强于冬季，因此通过Yang（2007）讨论的机制，TSWC也发生了类似的季节变化。另一方面，局地风应力随东亚季风的变化而变化，导致冬季南风倾向于减少TSWC的输送，而夏季北风则有利于更强的输送。模式试验表明，公海的贡献比局地风应力的贡献重要得多。(C) 2012 Elsevier Ltd.版权所有。
Observations show that the Tsushima Warm Current (TSWC) varies considerably on a seasonal time scale, with strong northward transport into the Japan/East Sea (JES) in summer and weak transport in winter. It has been shown in the previous studies that the mean TSWC is forced primarily by wind stress over the open ocean, while the local wind stress is less important. Nevertheless, the forcing mechanisms for the seasonal variability of the TSWC remain to be examined. A three-dimensional ocean model is used to investigate the contributions from both local and the open-ocean forcing to the seasonal variability of TSWC. The observed seasonal cycle is simulated well in the model, and then three additional sensitivity runs were conducted to isolate the local and open-ocean forcing. It was shown that the open ocean forcing and the local wind stress both contribute to the seasonal cycle of the TSWC. The impact from the open ocean forcing is facilitated through the Kuroshio Current (KC) interaction with Honshu-Kyushu Islands. The KC transport is stronger in summer than in winter, thus a similar seasonal variability takes place in the TSWC through the mechanism discussed by Yang (2007). On the other hand, the local wind stress varies with the East Asian Monsoon, which results in that the southward wind in winter tends to reduce the TSWC transport while the northward wind in summer is favorable for a stronger transport. The model experiments showed that the contribution from the open ocean is considerably more important than the contribution from the local wind stress forcing. (C) 2012 Elsevier Ltd. All rights reserved.