In the South Pacific Ocean, upper and lower Circumpolar Deep Water (UCDW and LCDW, respectively) occupy the deep layers; however, the presence and fate of both these water masses in the western equatorial Pacific have been mostly based on sparse measurements in both space and time. In this study, unprecedented deep measurements from three cruises conducted in the Solomon Sea region along with the World Ocean Atlas 2018 database are examined to better characterize the properties and pathways of deep water in the Southwest Pacific. At depths encompassing most of the UCDW, estimated transports derived from two inverse model solutions indicate interbasin exchanges between the Solomon Sea Basin and the Coral Sea Basin to the south and the East Caroline Basin to the north. The deep water transport variability found across the Solomon Sea is consistent with observed water mass modifications due, for the most part, to diapycnal mixing. At depths greater than about 2600 m, deep water inflow into the Solomon Sea Basin is limited to the south, emanating from the Coral Sea remote basins via complex trench topography. Spreading of LCDW in the Coral Sea and subsequently into the Solomon Sea is blocked by the Tonga-Kermadec Ridge to the east and bottom topography to the south, however, the densest part of UCDW entering both the Coral and Solomon Seas is likely influenced by LCDW properties, as oxygen is found to increase and silicate decrease with depth in the region. Waters trapped in closed deep basins, in the Bismarck Sea below 1750 m and the northern Solomon Sea below 3500 m show a remarkably constant pattern in oxygen with depth.

在南太平洋，上下极极深水区（分别为UCDW和LCDW）占据了较深的水层。然而，这两种水团在赤道西太平洋的存在和命运主要是基于对时空的稀疏测量。在这项研究中，检查了所罗门海地区进行的三次航行的空前深度测量以及《 2018年世界海洋图集》数据库，以更好地表征西南太平洋深水的性质和路径。在涵盖大多数UCDW的深度处，从两个逆模型解推导出的估计输运量表明，所罗门海盆地和珊瑚海盆地之间的盆地间交换位于南部，而东卡罗琳盆地则位于北部。在所罗门海中发现的深水运输变异性与观测到的水质变化相一致，这在很大程度上是由于二苯并混而造成的。在大于约2600 m的深度处，所罗门海盆地的深水流入仅限于南部，它是通过复杂的海沟地形从珊瑚海偏远盆地喷出的。LCDW在珊瑚海中的传播，然后扩散到所罗门海中，这被东部的汤加-克马德克海脊和南部的底部地形所阻止，但是，进入珊瑚礁和所罗门海的UCDW的最密集部分很可能受到LCDW的影响性能，因为发现该区域的氧气随深度增加而硅酸盐减少。被困在封闭的深水盆地中的水域，