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Analysis of thermohaline and current distribution characteristics of Zhejiang and Fujian waters in summer

Acta Oceanologica Sinica 2011年第5期30卷 71-83页

作者： DU Panjun ZHANG Hui XIAO Wenjun KANG Xing GUAN Qinle East China Sea Marine Forecasting Center East China Sea Branch State Oceanic Administration Shanghai 200081 China State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai 200062 China

This paper analyzed the distribution of thermohaline and circulation characteristics of Zhejiang and Fujian waters,based on the cross-sectional thermohaline data and on current data （up to 30 d duration） at fixed-point moorings,collected in the summer of *** also performed low-pass filtering and spectrum analysis on the mooring submersible buoy *** on that analysis,we discussed the characteristics of low frequency currents and time-variations in these *** main conclusions are as follows.（1） There is a low salinity pinnate area near the Hangzhou Bay in summer,and outside the low salinity area,an obvious salinity front is present from surface to bottom near 123 *** is also a temperature front below the surface at a corresponding position.（2） Bottom water of the Taiwan Warm Current comes from the subsurface of kuroshio.（3） The direction of low frequency current at fixed anchor stations is N-NE or S,which mainly depends on the interaction of control currents in this waters.（4） Significant spectral peaks at all mooring stations are typically semidiurnal and diurnal *** tidal waves are the main ones in these waters,and have more energy closer to the shore.（5） Significant energy spectral peaks of middle period （3 to 8 d） of currents are responses to weather frequency.（6） Significant energy spectral peaks of long periods at the surface or bottom are probably responses to seasonal wind or bottom friction,while,the long period peaks of other depths can reflect cyclical changes of interactions between *** conclude that the pulsation period of the Taiwan Warm Current in these waters is 10-17 d.

关键词： Zhejiang and Fujian waters thermohaline distribution low-frequency current spectrum analysis Taiwan Warm Current kuroshio subsurface water

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