A sea temperature data assimilation system for the China Seas and adjacent areas

作者：You XB^*; Zhou GQ; Zhu J; Li RF

来源：Chinese Science Bulletin, 2003, 48: 70-76.

DOI：10.1360/03wd0535

• nested model
• data assimilation
• variational method
• Kuroshio
• Yellow Sea cold water mass
• dipole eddies

A sea temperature data assimilation system for the China Seas and adjacent areas is developed based on a nested regional ocean circulation model and variational optimal interpolation assimilation method. A 12-year assimilation experiment is performed by using the observational temperature profiles from World Ocean Database 1998 (WOD98) and ECMWF reanalysis surface wind stress. Experimental results indicate that the variational scheme shows good skill in assimilating the observed sea temperature into a regional ocean circulation model. Compared with simulation alone, the sea temperature data assimilation significantly improves the performance of a regional ocean model and obtains comprehensive description of the circulations in the China Seas and adjacent areas. Assimilation results, such as the strength and flowing axis of the Kuroshio, Yellow Sea Cold Water Mass and its corresponding horizontal circulation in summer and dipole eddies in the South China Sea in the late summer/early autumn and the eastward jet between them, are well consistent with the observed evidences.

• 出版日期2003-12
• 单位中国科学院大气物理研究所