재분석자료에 나타난 동아시아 지역해 해양순환변동성

Abstract

Long-term variability of the hydrographic conditions and circulation in the East Asian Marginal Seas (EAMS) is examined using the Simple Ocean Data Assimilation (SODA) product. Even though the SODA data resolve the overall pattern of circulation in the EAMS, there are differences between the reanalysis product and observations in detail. The volume transport of the Tsushima Current through the Korea Strait, which supplies warm water into the East/Japan Sea (EJS) to influence significantly the hydrographic conditions of the upper layer in the southern region of the EJS, estimated from the SODA data is much less than the observed one.In terms of decadal variability of temperature, there is discrepancy between the SODA data and observations in some regions though the warming trend shown in most regions is similar between them. For example, while decadal variability of temperature at intermediate depths in the southern region of the EJS is reproduced well in the SODA data, it is not realistic in the northwestern region, which might come from the lack of observation data assimilated into the SODA system.