CAJ | 학술논문

采用海洋实测资料和简单海洋数据同化(SODA)模式再分析资料研究了印度洋偶极子(IOD)事件影响下赤道印度洋秋季Wyrtki急流及其盐度输运的年际变化特征.结果表明, 在正、负IOD事件盛期, 赤道流场和盐度异常不仅呈反位相特征,在空间分布及强度上还具有显著的不对称性.正IOD事件盛期, Wyrtki急流转向为西向流,将赤道印度洋东部低盐水向西输送; 此时赤道流场和盐度负异常显著, 影响范围大, 南北扩张明显, 盐度异常中心偏西, 影响深度较深.负IOD事件盛期, Wyrtki急流增强,对赤道印度洋西部高盐水输送能力增强;此时盐度及流速异常较弱,极值范围小,盐度异常中心偏东, 影响深度较浅, 但流速异常影响深度较正IOD事件深.
채용해양실측자료화간단해양수거동화(SODA)모식재분석자료연구료인도양우겁자(IOD)사건영향하적도인도양추계Wyrtki급류급기염도수운적년제변화특정.결과표명, 재정、부IOD사건성기, 적도류장화염도이상불부정반위상특정,재공간분포급강도상환구유현저적불대칭성.정IOD사건성기, Wyrtki급류전향위서향류,장적도인도양동부저염수향서수송; 차시적도류장화염도부이상현저, 영향범위대, 남북확장명현, 염도이상중심편서, 영향심도교심.부IOD사건성기, Wyrtki급류증강,대적도인도양서부고염수수송능력증강;차시염도급류속이상교약,겁치범위소,염도이상중심편동, 영향심도교천, 단류속이상영향심도교정IOD사건심.
We analyzed the interannual variability of the Wyrtki Jet and its salinity transport associated with Indian Ocean Dipole (IOD) in fall season using observations and Simple Ocean Data Assimilation (SODA). During negative IOD events, the Wyrtki Jet strengthened in the equatorial Indian Ocean, forced by enhanced equatorial westerly wind, which favors a stronger eastward transport of high-salinity water. During positive IOD events, the above-mentioned processes reversed. In addition, both the Wyrtki Jet and associated salinity transport anomalies on the strength and spatial distribution displayed significant asymmetric characteristics between the positive and negative IOD events. The amplitudes of zonal velocity and salinity anomalies were stronger during the positive IOD events. The anomalies centered in the central equatorial Indian Ocean during the positive IOD events, but they moved to the east in the negative IOD events. Moreover, the velocity anomalies reached a deeper depth during the negative IOD events, even though the salinity anomalies occurred at a rather shallow depth.