Dissolved gallium (Ga) from the US GEOTRACES GP17-OCE cruise on R/V Roger Revelle (RR2214) in the South Pacific and Southern Oceans from December 2022 to January 2023

Dissolved gallium (Ga) was determined in association with a US GEOTRACES cruise (GP17-OCE/RR2214) in the South Pacific and Southern Ocean. The cruise sampled formation regions for globally distributed water masses, the return flow of Pacific Deep Water into the Southern Ocean, hydrothermally influenced waters, margin waters, and a gradient of low to high productivity with varying limiting nutrients. The cruise track investigates circulation through the Antarctic Circumpolar Current (ACC) and formation of intermediate waters important for upper ocean nutrient supply. The overall circulation/productivity/export/recycling trap of this region also affects how oceanic element-element relationships develop. For Ga, its distribution can provide insight into dust delivery, which recent work has suggested may be higher than previously thought in the study area. Ga's limited reactivity also allows its distribution to be used for water mass deconvolution, which could be usefully applied to the ACC and intermediate water formation regions. Data include dissolved Ga concentrations from bottle and towed fish samples.

溶解态镓（Ga）的测定与美国的GEOTRACES巡航（GP17-OCE/RR2214）在太平洋南部和南大洋的航行相关联。此次航行采集了全球分布水团的生成区域、太平洋深层水返回南大洋的回流、受热液影响的区域、边缘水以及从低到高生产力的梯度变化，并考虑了限制性营养物质的差异。航行轨迹研究了通过南极环流（ACC）的环流以及形成对上层海洋营养物质供应至关重要的中层水。该区域的总体环流/生产力/输出/循环捕获机制亦对海洋元素-元素关系的发展产生重要影响。对于镓而言，其分布情况能够提供对尘埃输运的见解，近期的研究表明，该研究区域的尘埃输运可能高于先前所想。镓的低反应性也使其分布能够用于水团去卷积，这对于ACC和中间水形成区域的应用具有实际价值。数据包括瓶装和拖曳鱼样中的溶解镓浓度。