南大洋沿150°W的生物、生物地球化学、生物光学和物理变率及其与大方解石带的相关性

IF 5.5 2区 地球科学 Q1 ENVIRONMENTAL SCIENCES
W. M. Balch, D. J. McGillicuddy Jr., N. R. Bates, P. L. Morton, D. Drapeau, B. Bowler, S. Pinkham, M. Enright, R. Garley, H. Oliver
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引用次数: 0

摘要

我们报告了沿南大洋150°W, 30°S至60°S以及极地水域向东进行的经向样带的水文和生物地球化学测量。这两个地区都是海洋颜色遥感中具有年度高反射率特征的地点,迄今为止从未通过实地测量得到证实。本研究旨在记录在被称为大方解石带(Great Calcite Belt, GCB)的环极球石藻富带中浮游植物生产力和球石藻钙化的驱动因素。我们测量了颗粒无机碳(PIC)和生物硅(BSi)的浓度,这两种常见的生物矿物质是有机物的镇流器来源,也是光学反射率的贡献者。结果表明:综合真光常绿储量在54°S以南的GCB和极锋地区最高;BSi浓度在54°S以南最高。综合钙化率在极锋和亚南极锋附近最高,而光合作用率在靠近亚南极模态水形成位置的GCB亚南极水域最高。在~ 54°S以南,BSi的光学微粒后向散射(bbp)比PIC的bbp多10倍,而在GCB, PIC的bbp比BSi的bbp多10倍。粒径分布函数的斜率随深度的增加而减小,这一趋势反映了大颗粒相对于小颗粒变得更丰富。此外,粒径分布坡度与光束衰减之间的典型关系仅在顶部50 m深度观察到,这表明该区域较深悬浮液的粒径组成和大小存在根本差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Biological, Biogeochemical, Bio-Optical, and Physical Variability of the Southern Ocean Along 150°W and Its Relevance to the Great Calcite Belt

Biological, Biogeochemical, Bio-Optical, and Physical Variability of the Southern Ocean Along 150°W and Its Relevance to the Great Calcite Belt

Biological, Biogeochemical, Bio-Optical, and Physical Variability of the Southern Ocean Along 150°W and Its Relevance to the Great Calcite Belt

Biological, Biogeochemical, Bio-Optical, and Physical Variability of the Southern Ocean Along 150°W and Its Relevance to the Great Calcite Belt

We report hydrographic and biogeochemical measurements from a meridional transect performed along 150°W, 30°S to 60°S in the Southern Ocean, plus Polar waters to the east. Both of these areas are sites of annual high-reflectance features in ocean color remote sensing, which were heretofore never confirmed with in situ measurements. This study aimed to document factors driving phytoplankton productivity and coccolithophore calcification within the circumpolar coccolithophore-rich band known as the Great Calcite Belt (GCB). We measured concentrations of particulate inorganic carbon (PIC) and biogenic silica (BSi), two common biominerals, sources of ballast for organic matter, and contributors to optical reflectance. Results demonstrated that integrated euphotic standing stocks of PIC were highest in the GCB and at the Polar Front south of 54°S. BSi concentrations were highest south of 54°S. Integrated calcification rates were highest near the Polar and Subantarctic Fronts, whereas peak photosynthesis rates were observed in Subantarctic waters of the GCB, near the site of Subantarctic Mode Water formation. South of ∼54°S, optical particulate backscattering (bbp) of BSi dominated over PIC bbp by 10×, while in the GCB, PIC bbp dominated over BSi bbp by a similar magnitude. The slope of the particle size distribution function became less negative with depth, a trend that reflects larger particles becoming more abundant relative to smaller particles. Moreover, typical relationships between the particle size distribution slope and beam attenuation were only observed in the top 50 m depth, suggesting a fundamental difference in particle composition and size for deeper suspensions in this region.

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来源期刊
Global Biogeochemical Cycles
Global Biogeochemical Cycles 环境科学-地球科学综合
CiteScore
8.90
自引率
7.70%
发文量
141
审稿时长
8-16 weeks
期刊介绍: Global Biogeochemical Cycles (GBC) features research on regional to global biogeochemical interactions, as well as more local studies that demonstrate fundamental implications for biogeochemical processing at regional or global scales. Published papers draw on a wide array of methods and knowledge and extend in time from the deep geologic past to recent historical and potential future interactions. This broad scope includes studies that elucidate human activities as interactive components of biogeochemical cycles and physical Earth Systems including climate. Authors are required to make their work accessible to a broad interdisciplinary range of scientists.
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