A numerical study on the Changjiang diluted water in the Yellow and East China Seas
A numerical study on the Changjiang diluted water in the Yellow and East China Seas
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DOI：
10.1029/2002jc001749
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发表时间：
2003-09-23
影响因子：
3.6
通讯作者：
Isobe, A
中科院分区：
文献类型：
--
作者：
Chang, PH;Isobe, A
利用普林斯顿海洋模式（POM）对长江冲淡水（CDW）的行为进行了数值模拟，并评估了黄、东海的淡水收支。此外，还讨论了控制CDW行为的主要过程。模拟的CDW分布与观测的分布相当一致，显示出显著的季节变化。夏季，CDW向东北方向延伸至对马/朝鲜海峡，而冬季，它在一个狭窄的带内向西南方向拥抱中国海岸。利用示踪实验对长江淡水进行了示踪，并对黄、东海淡水收支进行了估算。结果表明，在秋、冬季，长江流量的68%左右通过对马/朝鲜海峡输送，27%左右通过台湾海峡输送。为了研究控制上述CDW行为的主要过程，在无风强迫的情况下进行了另一个实验。研究发现，大陆架上的“台湾-对马暖流系统”强烈地制约着CDW的东向延伸。然而，在夏季，风是CDW向东北延伸的原因。此外，台湾海峡冬季的西南延伸是由强东北季风造成的。在无风强迫的情况下，对马/朝鲜海峡的淡水输送量增加到长江总流量的90%。
A numerical simulation is performed using the Princeton Ocean Model (POM) to investigate the behavior of the Changjiang Diluted Water (CDW), and to evaluate the freshwater budget in the Yellow and East China Seas. In addition, the major process controlling the behavior of the CDW is discussed. The simulated CDW distributions are fairly consistent with the observed distributions, showing a remarkable seasonal variation. The CDW extends to the northeast toward the Tsushima/Korea Straits during summer, while it hugs the Chinese coast to the southwest within a narrow band in winter. Tracer experiment is carried out to track the freshwater originating only from the Changjiang, and to evaluate the freshwater budget in the Yellow and East China Seas. The result shows that about 68 percent of the Changjiang discharge is transported through the Tsushima/Korea Straits, and that about 27 percent is transported through the Taiwan Strait in autumn and winter. To investigate the main process controlling the behavior of the CDW mentioned above, another experiment is carried out without wind-forcing. It is found that the eastward extension of the CDW is strongly constrained by the "Taiwan-Tsushima Warm Current System'' over the shelf regime. The wind is, however, responsible for the northeastward extension of the CDW in summer. In addition, the southwestward extension at the Taiwan Strait during winter is done by strong northeasterly monsoon. The experiment without wind-forcing shows that freshwater transport through the Tsushima/Korea Straits increases to 90 percent of the total Changjiang discharge.