Interannual salinity variations in the Tsushima Strait and its relation to the Changjiang discharge
Interannual salinity variations in the Tsushima Strait and its relation to the Changjiang discharge
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DOI：
10.1007/s10872-006-0086-y
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发表时间：
2006-10
影响因子：
2.3
通讯作者：
T. Senjyu;Hirofumi Enomoto;T. Matsuno;Sigeaki Matsui
中科院分区：
文献类型：
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作者：
T. Senjyu;Hirofumi Enomoto;T. Matsuno;Sigeaki Matsui
根据历史水文数据调查了对马海峡盐度的年际变化。 EOF分析表明最主要的模式是东部和西部河道之间的同相盐度变化。夏季EOF第一模态的时间系数与长江流量呈负相关，说明夏季对马海峡盐度呈下降趋势，与长江流量较大有关。尽管低盐度水主要流经西部河道，但第一模态的特征向量在东部河道中大于在西部河道中。这是因为夏季长江流量较大，低盐度水会扩散到东部河道和西部河道。提取通道间的异相盐度变化作为EOF第二模态；这是西部海峡的主要变化。夏季第二种模态的时间系数与西部航道的输运量以及各航道之间的输运差异没有显着的相关性。提出了EOF第二模态与东海风应力变化之间的关系。
Interannual salinity variations in the Tsushima Strait are investigated on the basis of historical hydrographic data. The EOF analysis revealed that the most dominant mode is the in-phase salinity variation between the eastern and western channels. The time coefficients of the EOF first mode in summer show a negative correlation with the Changjiang discharge, which indicates that salinity in the Tsushima Strait tends to decrease over summer, related to a large discharge of the Changjiang. The eigenvectors of the first mode are larger in the eastern channel than those in the western channel, though the low salinity water mainly flows through the western channel. This is because the low salinity water spreads into the eastern channel as well as the western channel over summers with a large discharge of the Changjiang. The out-of-phase salinity variation between the channels is extracted as the EOF second mode; this is the predominant variation in the western channel. The time coefficients of the second mode in summer show no significant correlations to the volume transports through the western channel and the transport differences between channels. A relationship between the EOF second mode and variations in the wind stress over the East China Sea is suggested.