黄-东海界面水通量和溶解无机氮交换通量的年际变化OACSCD

The boundary between the Yellow Sea(YS)and the East China Sea(ECS)(YE Section)reflects the in-teraction effects between the YS and the ECS.This study analyzed the interannual variations in water volume and dissolved inorganic nitrogen(DIN)exchange fluxes across the YE Section from 2010 to 2018,based on hydrody-namic and ecological field results obtained using a three-dimensional physical-biochemical coupled model.The results showed significant interannual variations in water volume and DIN exchange fluxes across the YE Section.The average water volume exchange over the 9-year period was 0.35×106 m3/s,with the maximum occurring in 2017 and the minimum in 2014.The multi-year average DIN flux was 2.71×106 mmol/s.The maximum DIN flux also appeared in 2017,coinciding with the year of the highest water flux,whereas the minimum occurred in 2011,when DIN concentrations were the lowest.The analysis indicated that the interannual variations in DIN flux across the YE Section were primarily controlled by the interannual changes in water volume transport.Spatially,the in-terannual variations in DIN flux were more pronounced in the upper waters of the western part of the YE Section and in the bottom waters of the eastern part.The interannual variations of DIN flux in the upper waters of the west-ern part were mainly controlled by interannual changes in current velocity,whereas those in the bottom eastern wa-ters were jointly regulated by interannual variations in DIN concentration and current velocity.Additionally,the dominant factors controlling interannual variations in DIN fluxes differed between winter and summer across the YE Section.In winter,water volume transport and DIN concentration contributed to the variations,whereas in summer,the variations were primarily controlled by water flux.