Observed dissolved gallium in the tropical and subtropical waters in the Western Pacific Ocean

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology Pub Date : 2024-12-17 DOI:10.1016/j.chemgeo.2024.122573

Zheng Bo Liu, Jing Zhang, Shuo Jiang, Han Su, Jingling Ren, Hang Zhang, Shijian Hu

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引用次数: 0

Abstract

The concentration data of Gallium (Ga) observed in the Western Pacific section spanning from 2°S to 20°N along 142°E are reported for the first time. The spatial distribution of Ga in the surface, subsurface, intermediate, and deep layers is presented, and its influencing factors are discussed. We find that terrestrial input from Papua New Guinea constitutes a significant source of surface Ga in this region, while the distribution of Ga concentrations is regulated by water mass mixing. The elevated concentrations of dissolved Ga in the subsurface are derived from the North Pacific Subtropical Mode Water, implying that the latter exerts significant influence on the spreading of dissolved Ga. The Ga concentration in intermediate waters is mainly governed by the Antarctic Intermediate Water (AAIW). A strong correlation (R2 > 0.8) is found between Ga concentration and salinity at depths of deep waters, and the non-conservative behavior of Ga in deep waters is difficult to detect in this region. Profile structures of Ga concentration inside the Philippine Sea basin are different from that outside the basin, indicating that the Ga concentration may reflect the upwelling of deep water within the basin. We further compared the concentration data of Ga with those from the GS01, GP16, GP15, IOC2002, and VERTEX cruises in terms of distribution, behavior and potential usage. We suggest that Ga exhibits promising potential as a new tracer for monitoring intermediate and deep water masses, and Ga concentration can serve as a good indicator for the AAIW and Upper Circumpolar Deep Water.

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在西太平洋热带和亚热带水域中观察到溶解的镓

本文首次报道了沿142°E从2°S到20°N的西太平洋剖面上镓（Ga）的浓度资料。介绍了Ga在地表、地下、中层和深层的空间分布，并对其影响因素进行了讨论。我们发现来自巴布亚新几内亚的陆地输入构成了该地区地表Ga的重要来源，而Ga浓度的分布受水团混合的调节。地下溶解Ga浓度的升高来源于北太平洋副热带海水，表明北太平洋副热带海水对溶解Ga的扩散有重要影响。中间水的Ga浓度主要受南极中间水（AAIW）的控制。强相关(R2 >；在该区域，深水Ga浓度与盐度之间存在0.8)的关系，难以探测到深水Ga的非保守行为。菲律宾海盆地内Ga浓度剖面结构与盆地外不同，表明盆地内Ga浓度可能反映了盆地内深水上升流。我们进一步将Ga的浓度数据与GS01、GP16、GP15、IOC2002和VERTEX的浓度数据在分布、行为和潜在使用方面进行了比较。我们认为，Ga作为一种新的示踪剂在监测中深水团方面具有很大的潜力，Ga浓度可以作为AAIW和上环极深水的良好指标。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemical Geology 地学-地球化学与地球物理

CiteScore

7.20

自引率

10.30%

发文量

374

审稿时长

3.6 months

期刊介绍： Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.