An Analysis of Heat and Fresh Water Flux in the Japan Sea

日本海热量和淡水通量分析

• 批准号: 63540310
• 负责人: SUDO Hideo
• 金额: $ 1.09万
• 依托单位: 東京水産大学
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63540310/
• 关键词: Sea Surface Salinity; Japan Sea Proper Water; Heat Flux; Fresh Water Flux; Density Inversion; Geostrophic Transport; 表層混合層; 日本海表層水; 対馬暖流

Monthly means charts of temperature, salinity and density at the sea surface and their differences between sea surface and 10 m depth are constructed for the area north of 33'N and east of 127'E from available historical data. In late autumn to winter a density inversion of about 0.1 kg m^<-3> frequently occurs in the greater part except near the coast and west of the northern Japan. The density difference between sea surface and 10 m depends primarily upon the salinity difference and shows a regular annual cycle as well as the sea surface salinity in the Tsushima Warm Current area of the southwestern part of the sea. A high surface density of 27.30 kg m^<-3> or more with a high salinity of 34.05 or more is occasionally shown north of 40'N, west of 138'E in winter ; it is close to the density of the upper portion of the Japan Sea Proper Water and its mixed layer extends to a depth of 500 m. Geostrophic transports for hydrographic sections in the Japan Sea show that there must be a level of no motion at a depth of about 1000 m or more. Heat flux estimated as geostrophic advection varies greatly according to choice of level of no motion, while there is practically no difference between heat flux from the sea surface to 1000 m and that to the sea bottom. The net heat flux for the water column is considered to be outward in the southern part of the sea in spring and summer. Large-scale fresh water flux is not significant except for the southern part in summer to autumn.

每月平均平均温度图表，海面的温度，盐度和密度图及其在33'n和127'e以东的海面和10 m深度之间的差异从可用的历史数据中构建。在秋天到冬季，密度反转约0.1 kg m^<-3>经常发生在大部分地区，除了在日本北部的海岸和西部附近。海面和10 m之间的密度差主要取决于盐度差异，并显示了海洋西南部Tsushima温暖当前地区的常规年度周期以及海面盐度。高表面密度为27.30 kg m^<-3>或更多，高盐度为34.05或更多，有时在40'n以北显示，冬季在138'e以西；它接近日本海洋水的上部的密度，其混合层延伸至500 m的深度。日本海中水文切片的地质传输表明，必须在约1000 m或更高的深度下没有运动水平。根据无运动水平的选择，估计的热通量估计为地球化学的对流差异很大，而从海面到1000 m的热通量几乎没有差异，而在海底却没有差异。春季和夏季，水柱的净热通量被认为是海洋南部的外部。除了夏季至秋天的南部，大规模的淡水通量并不重要。