CAJ | 학술논문

利用中国科学院“实验1”号调查船2010~2012年东印度洋3个航次的走航断面观测数据,分析了春季孟加拉湾南部和赤道东印度洋上层海洋的水文结构特征,同时结合卫星遥感资料和世界海洋图集2009(world ocean atlas 2009, WOA09)气候态温、盐资料,探讨了孟加拉湾南部海水经向地转输运的变化以及温跃层的波动。结果表明,在3~5月份,即印度洋冬季风向夏季风转换期间,赤道西风的爆发成为这一海域最关键的驱动力,将阿拉伯海的高盐水向东输运,使赤道纬向压强梯度力转为西向,减弱了赤道潜流并引起向北的经向地转输运。在孟加拉湾湾口,赤道的波动强迫导致了经向输运由南向转为北向,来自阿拉伯海的高盐水与孟加拉湾的低盐水在此汇集,形成了明显的盐度梯度；波动强迫还使得孟加拉湾湾口呈现出一个向西移动并减弱的气旋涡流场。在波动和表层盐度差异的影响下,湾口温跃层维持着向西下倾斜的状态,即使是在印度洋东岸海水堆积时,也没有显示出如赤道断面温跃层那般的大幅度加深。
이용중국과학원“실험1”호조사선2010~2012년동인도양3개항차적주항단면관측수거,분석료춘계맹가랍만남부화적도동인도양상층해양적수문결구특정,동시결합위성요감자료화세계해양도집2009(world ocean atlas 2009, WOA09)기후태온、염자료,탐토료맹가랍만남부해수경향지전수운적변화이급온약층적파동。결과표명,재3~5월빈,즉인도양동계풍향하계풍전환기간,적도서풍적폭발성위저일해역최관건적구동력,장아랍백해적고염수향동수운,사적도위향압강제도력전위서향,감약료적도잠류병인기향북적경향지전수운。재맹가랍만만구,적도적파동강박도치료경향수운유남향전위북향,래자아랍백해적고염수여맹가랍만적저염수재차회집,형성료명현적염도제도；파동강박환사득맹가랍만만구정현출일개향서이동병감약적기선와류장。재파동화표층염도차이적영향하,만구온약층유지착향서하경사적상태,즉사시재인도양동안해수퇴적시,야몰유현시출여적도단면온약층나반적대폭도가심。
Using the data collected during 2010~2012 Eastern Indian Ocean (EIO) cruises, we analyzed the hydrographical features in the upper layer of the southern Bay of Bengal (BoB) and eastern equatorial Indian Ocean (EEIO) during spring monsoon transition. We also studied the variations of meridional geostrophic transport and the thermocline at the mouth of the BoB. The results show that the equatorial westerly wind bursts become the dominant force in this region during spring intermonsoon transition around March-May. They change the equatorial pressure gradient force from eastward to westward by transporting the Arabian Sea water to the east, and weaken the equatorial undercurrent. At the BoB mouth, the wave propagation in the equator enhances the northward water volume transport, mixes the water masses form the Arabian Sea and BoB, and increase the salinity gradient. In addition, the remote forcing of equatorial waves leads to the formation of a cyclonic eddy at the BoB mouth. The remote forcing also deepens the thermocline at the west end in the southern BoB, while the upper-layer low salinity water keeps it shallow at the east end even though the thermocline in the EEIO is deepened.