阿拉伯海高盐水入侵孟加拉湾的季节形态及动力机制

本研究利用Argo温盐、Aquarius遥感盐度等资料,研究了阿拉伯海高盐水入侵孟加拉湾的主要路径及季节变化机制.分析显示阿拉伯海高盐水入侵孟加拉湾存在3种类型,即夏季型、冬季型和春季型.夏季型入侵发生在湾口西部,入侵时间为7—10月,净体积输送达1.53 Sv.冬季型(12月至次年1月)和春季型(3—5月)阿拉伯海高...

easonal patterns of Arabian Sea high-salinity water intrusion into the Bay of Bengal and its dynamic mechanism

Sea surface salinity from Argo and Aquarius data is used to explore seasonal pathways for Arabian Sea high salinity water (ASHSW) intrusion into the Bay of Bengal (BOB). The data show that there are three types of, i.e. summer, winter and spring, ASHSW intrusions into the BOB. In summer (i.e. July to October), ASHSW intrudes into the BOB via the western bay mouth with a net volume transport of 1.53 Sv. In winter (December to next January) and spring (March to May), ASHSW intrusions occur in the central and eastern bay mouths with relatively weaker net volume transports of 0.39 Sv and 0.41 Sv, respectively. The intrusion branch of the Southwest Monsoon Current (SMC) is the main factor transporting ASHSW into the BOB in summer. The fall Wyrtki Jet raises the sea level off the coast of Sumatra, resulting in high sea surface high in the eastern bay mouth and a positive (i.e. westward) sea surface high gradient. Then, this westward zonal pressure gradient force drives the northward geostrophic current, which ultimately induces the intrusion of ASHSW into the BOB in winter. The spring Wyrtki Jet is also a major cause for the intrusion of ASHSW during this period under almost the same dynamics in winter.