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《Periodical of Ocean University of China》 2015-01
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The Effect of Decadal Salinity Variations on Circulation in the Bohai Sea

BI Cong-Cong;BAO Xian-Wen;WAN Kai;College of Physical and Environmental Oceanography,The Key Laboratory of Physical Oceanography,Ministry of Education,Ocean University of China;  
By using the 10-year-averaged salinity fields in five decades(from 1950 sto present),a three-dimensional ROMS model is established to diagnostically calculate the density currents in the Bohai Sea during the different periods.Through the comparison and analysis of the results,the decadal variations of the salinity fields and its impact on circulation are discussed.It is shown that since the 1980 s,the salinity distribution in the Bohai Sea has changed a lot in summer and winter,and its horizontal gradient has been decreasing.Salinity value in the interior zone of the Bohai Sea is relatively higher than that in the Bohai Strait recently,which is a completely opposite situation to the past.Density currents of the Bohai Sea are stronger in summer than that in winter,and they contribute a lot to general circulation during summertime.In summer,the variations of salinity has led to a little of difference on currents.After the 1990 s,local changes of currents can be found in the central area,Bohai Bay and Laizhou Bay,the main form of which is the decrease of flow velocity.Volumetric flux and salinity flux induced by density currents through some representative sections show a generally dropping trend in summer as time goes by.The exchange values of the Bohai Strait have decreased from 7.85×104 m3/s and 2.49×106 kg/s in the 1950 sto 7.09×104 m3/s and 2.27×106kg/s after the 1990 s.
【Fund】: 国家高技术研究发展计划项目(2001AA092104)资助
【CateGory Index】: P731
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