Asymmetry of seasonal sea surface temperature variation in the sea around Korean Peninsula

sea surface temperature;seasonal variation;asymmetry;surface heat flux;heat advection;550

자연과학대학 지구환경과학부 ;

University:서울대학교 대학원

关键词: sea surface temperature;    seasonal variation;    asymmetry;    surface heat flux;    heat advection;    550;   

Others  :  http://s-space.snu.ac.kr/bitstream/10371/131378/1/000000017403.pdf

美国|英语

来源: Seoul National University Open Repository

【 摘 要 】

. ;;day ratio’ defined as a ratio of number of days in increasing temperature trend to total days.;;Amplitude ratio’ means ratio of semi-annual amplitude to annual amplitude of temperature variation implies that the seasonal variation of temperature is asymmetric if day ratio is far from 0.5 or amplitude ratio is large. Day ratio of SST shows an opposite feature to air temperature. Air temperature increases slowly, whereas SST decreases slowly in the study area. Spatial distribution of SST amplitude ratio is more complex than that of air temperature. There are substantial disagreement between the day ratio and the amplitude ratio over the highly asymmetric regions, such as northern East/Japan Sea and Kuroshio path. Phase difference between annual and semi-annual components causes this disagreement.Heat advection and surface heat flux were estimated using model SST and current data. Incoming heat advection shows negative correlation with the asymmetry index of the SST seasonal variation, whereas surface net heat flux has positive correlation with the SST asymmetry index. Model sensitivity test, which performs no current along the boundary, shows prominent cause of asymmetry in seasonal variation different feature. Asymmetry decreases significantly when there is no current.