Abstract Data from 13 autonomous profiling BGC-Argo floats, equipped with biogeochemical and bio-optical sensors deployed between 2011 and 2016, were used to explore the potential of bio-optical methods to map deep biomass distribution in the Arabian Sea oxygen minimum zone (OMZ). Dissolved oxygen sensors revealed concentrations below 5 μmol kg−1 for much of the depth range between 200 and 400 m and below 1 μmol kg−1 in the centre of the OMZ, which is well below climatological values. Optical particle backscatter sensors revealed intensities within the upper OMZ that were nearly as high as within the euphotic zone. The distribution of these particulate scatterers was confined to oxygen concentrations below 1 μmol kg−1, with vertical distributions that exhibited maxima just below the top of the OMZ and decreased downward with similar attenuation to that expected for sinking organic matter. These distributions were very similar to those of nitrate deficits (ΔNO3) estimated from a float with an ultra-violet nitrate sensor (R2 = 0.54, p

中文翻译：

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自主剖面浮标观测揭示了阿拉伯海反硝化氧最低区深层生物量分布的动态

摘要 2011 年至 2016 年间部署的配备生物地球化学和生物光学传感器的 13 个自主剖面 BGC-Argo 浮标的数据被用于探索生物光学方法在阿拉伯海最低氧区（OMZ）中绘制深部生物量分布的潜力。 ）。溶解氧传感器显示 OMZ 中心 200 至 400 m 和低于 1 μmol kg-1 的大部分深度范围内的浓度低于 5 μmol kg-1，远低于气候值。光学粒子背向散射传感器显示上部 OMZ 内的强度几乎与透光区内的强度一样高。这些颗粒散射体的分布仅限于氧浓度低于 1 μmol kg−1，垂直分布在 OMZ 顶部下方表现出最大值并向下减小，其衰减与下沉有机物质的预期衰减相似。这些分布与从带有紫外线硝酸盐传感器的浮子估计的硝酸盐不足 (ΔNO3) 的分布非常相似 (R2 = 0.54, p