This paper is aimed at the whole Bohai Sea, as the complement and improvement of wave characteristics and extreme parameters. Wave fields were simulated in the Bohai Sea by using wave model SWAN from 1985 to 2004. The input data based on the hindcast of high-resolution wind fields from RAMS and water level fields from POM, which have been tested and verified well. Comparisons of significant wave heights between simulation and station observations show a good agreement in general. By statistical analysis, the wave characteristics such as significant wave heights, dominant wave directions and their seasonal variations are discussed. In addition, main wave extreme parameters and directional extreme values particularly for 100-year return period are investigated.
Based on the Hybrid Coordinate Ocean Model （HYCOM）, this article presents simulations of the three-dimensional dynamic and thermal structure of the North Pacific Ocean （NPO） in the time domain from January 1991 to December 2000. The baroclinic current field and its interannual variability in Northwest Pacific Ocean （NWPO）, especially, the Kuroshio Current （KC） and the Japan/East Sea （JES） are analyzed and discussed. The results show that the HYCOM covers a complete dynamic and thermo process with adequate representations of the eddy fields and variability in main spatial and temporal scales. The model is used to simulatethe strong interanual variability of the KC, which may affect the strength of the eastern bifurcation of the Tsushima Warm Current （TSWC）, named the Nearshore Branch （NB） in the JES. When the KC is strong and its axis is close to the Japan Island, the TSWC and its bifurcations in the JES would intensify accordingly. Our results confirm once again the hypothesis of Yang et al. that the KC determines the annual mean NB in the JES via the ＂island integral constraint＂. This article further extends this hypothesis to study the KC role in the NB on a time dependent scale.
