Kuroshio Thermohaline Temporal And Spatial Distribution Characteristics And Influencing Factors

Kuroshio in the East China Sea is studied as an important impact on the East China Sea circulation. It transports a lot of energy, momentum from the low latitude to mid-latitudes and changes heat in the region. The Kuroshio in the East China Sea plays a necessary role in coastal environment. Using the World Ocean Atlas 2005 by NOAA published in 2007 and topography database in 2006 by NGDC, exploring three-dimensional techniques for oceanic data analysis and figure manifestation with Matlab computer program, research the change of Temperature Core of Kuroshio in the East China Sea. Using the gridded precipitation data of the Asian region by JAMSTEC published in 2003 and the runoff of Changjiang diluted water in different month during 2003-2005, find characteristic of salinity on surface in a year. That is the foundation for understanding heat transfer accurately. The main conclusions are:1. Kuroshio in the East China Sea is high-temperature, but higher temperature in its internal area. From surface to 250m depth, the distributing area of warm-core is moving from middle axes of ECS-Kuroshio current to the east border, the warm-core range is reducing from larger than 30% to about 10%. There is no distinct changing for warm-core area below 250m. From the entrance to the exit of ECS-Kuroshio, the warm-core temperature is decreasing with Kuroshio current at the same depth upper the depth of 200m, but the temperature is increasing below the depth of 200m.2. We find that it has an obvious feature on surface salinity of Kuroshio in the East China Sea in different month. Firstly, salinity on surface is higher in January to March and December, and Max is 34.8. Salinity on surface is lower in June to September, and Min is 34.4.Then salinity in the rest of months between two dates. Secondly, salinity is the highest near the east side of the Kuroshio in the East China Sea where is close to Ryukyu Island. Finally, low-salt zone is near the northeastern Taiwan area in a year.3. Many factors affected the salinity on surface of Kuroshio in the East China Sea. Combined with previous studies and discussed the main reason of the salinity on surface of Kuroshio in the East China Sea. They are surface temperature, rain, Changjiang diluted water. Salinity on surface of Kuroshio in the East China Sea is mainly influenced by surface temperature near the shelf of contentious in November to February. Salinity on surface is impacted by precipitation in small-scale in January and summer, which mainly areas are the south of 25°N and near 30°N where ECS-Kuroshio flows into Tokara strait. Runoff of Changjiang diluted water in summer affect most to the salinity on surface of Kushiro in fan zone, the maximum runoff in July and the corresponding minimum salinity on surface of Kuroshio in fan zone in the East China Sea.