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利用复振幅传感器对北太平洋西部海洋悬浮颗粒物进行分析。

Analysis of oceanic suspended particulate matter in the western North Pacific using the complex amplitude sensor.

作者信息

Yoshida Atsushi, Tobo Yutaka, Adachi Kouji, Moteki Nobuhiro, Kawai Yoshimi, Sasaoka Kosei, Koike Makoto

机构信息

National Institute of Polar Research, Tachikawa, Tokyo, Japan.

Graduate Institute for Advanced Studies, SOKENDAI, Tachikawa, Tokyo, Japan.

出版信息

Sci Rep. 2024 Aug 29;14(1):20055. doi: 10.1038/s41598-024-70683-1.

DOI:10.1038/s41598-024-70683-1
PMID:39210010
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11362335/
Abstract

Oceanic suspended particulate matter (SPM) plays important roles in the coupling of climate and biogeochemical cycles via ocean-atmosphere interactions. However, methods for quantifying the properties of SPM in seawater have not yet been well established. Here we present the application of the recently developed complex amplitude sensor (CAS) for analyzing the complex forward-scattering amplitude of individual SPM (0.2-5.0 µm in diameter) obtained at depths of 0-100 m during a research cruise in the western North Pacific. The measured distribution of the complex amplitude indicated that the CAS-derived SPM data could be roughly classified into five major types. Comparison with reference sample's complex amplitude data and scanning electron microscopy analysis suggested that these types could be attributed mainly to diatom fragments, carbonaceous materials (likely organic matter), mineral dusts, iron oxides, or black carbon. Depth profiles revealed that relatively high concentrations of SPM, presumably dominated by diatom fragments and carbonaceous materials with peak diameters of 0.7-1.0 µm, were typically associated with elevated turbidities and chlorophyll a concentrations. Based on this case study, we discuss the practical advantages and limitations of using the CAS to measure size-resolved concentrations of SPM in seawater and to characterize its composition.

摘要

海洋悬浮颗粒物（SPM）通过海 - 气相互作用在气候与生物地球化学循环的耦合中发挥着重要作用。然而，量化海水中SPM特性的方法尚未得到很好的确立。在此，我们展示了最近开发的复振幅传感器（CAS）在分析北太平洋西部一次研究航次中于0至100米深度获取的单个SPM（直径0.2 - 5.0微米）的复前向散射振幅方面的应用。复振幅的测量分布表明，由CAS得出的SPM数据大致可分为五种主要类型。与参考样品的复振幅数据比较以及扫描电子显微镜分析表明，这些类型主要可归因于硅藻碎片、含碳物质（可能是有机物）、矿物粉尘、氧化铁或黑碳。深度剖面显示，相对较高浓度的SPM，推测主要由直径峰值为0.7 - 1.0微米的硅藻碎片和含碳物质主导，通常与浊度和叶绿素a浓度升高相关。基于此案例研究，我们讨论了使用CAS测量海水中按粒径分辨的SPM浓度及其成分特征的实际优势和局限性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab60/11362335/7f903bb6eeb3/41598_2024_70683_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab60/11362335/81f9ac6d15f1/41598_2024_70683_Fig1_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab60/11362335/a1629da5d291/41598_2024_70683_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab60/11362335/76e40f3070ee/41598_2024_70683_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab60/11362335/1cb8552e1176/41598_2024_70683_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab60/11362335/7f903bb6eeb3/41598_2024_70683_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab60/11362335/81f9ac6d15f1/41598_2024_70683_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab60/11362335/3446adc057c0/41598_2024_70683_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab60/11362335/d72df2f0c3db/41598_2024_70683_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab60/11362335/a1629da5d291/41598_2024_70683_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab60/11362335/76e40f3070ee/41598_2024_70683_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab60/11362335/1cb8552e1176/41598_2024_70683_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab60/11362335/7f903bb6eeb3/41598_2024_70683_Fig7_HTML.jpg

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