Abstract
In view of the fact that the practical salinity of the Bohai Sea in
January 2007 was significantly higher than the multi-year mean with its
horizontal distribution opposite to the latter, the factors that affect
the interannual variation of practical salinity in the Bohai Sea are
quantitatively analyzed based on the in-situ hydrological measurements,
the annual runoff data of the Yellow River into the sea, as well as the
precipitation and evaporation reanalysis data of EAR5. The results show
that the local freshwater supply not only dominates the magnitude of
salinity change in the Bohai Sea, but also causes the salinity in the
central Bohai Sea is higher than that in the Bohai Strait in winter in
some years which is in inverse to the climatological salinity field. The
seesaw distribution characteristics of the freshwater supply of the
Bohai, Yellow and East China Seas also strengthen the characteristics
that the salinity horizontal distribution opposite to the climatological
in the Bohai Sea in some years. Available observations also show that
the nutrient and inorganic carbon of the Bohai Sea are much higher than
that of the open ocean, which gives a rise of 0.02 ~0.2
g·kg-1 in Absolute Salinity. Therefore, it is necessary to replace the
Practical Salinity with the Absolute Salinity for the accurately
salinity changes study in the Bohai Sea.