Fluxes and Composition of Particulate Matter in the Water Column of South Baikal (between March 2015 and March 2016)

IF 1.2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Russian Geology and Geophysics Pub Date : 2023-02-17 DOI:10.2113/rgg20224476

E. Vologina, M. Sturm, S. S. Vorob’eva

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Abstract

—The paper provides the results of experiments with sediment traps in the deep-water part of the South Basin of Lake Baikal (depth of 1366 m), installed from March 2015 to March 2016 in order to study recent sedimentation within the lake. We present new data on total fluxes of particulate matter and fluxes of biogenic components (SiO2biog, Сorg, and Ntot) at different depths of the water column both for the whole year and for individual periods of the year. Diatom analyses were carried out for all obtained samples. The total flux of sedimentary material averaged 94.9 g/m2/y; the average fluxes of SiO2biog, Сorg, and Ntot were 23.9, 11.6, and 0.94 g/m2/y, respectively. The molar C/N ratio varies from 11 to 21 and indicates a predominance of allochthonous material in almost all samples. Maximum fluxes of sedimentary matter were recorded from 20 June to 20 July 2015. This period corresponds to the bloom of diatoms of the species Synedra acus. This species amounts to >94% of the total diatom content in all samples taken during this year. The recent predominance of Synedra acus in the water column, as well as in the surface bottom sediments of South Baikal, is probably due to the climate warming.

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南贝加尔湖水柱中颗粒物的通量和组成（2015年3月至2016年3月）

本文提供了2015年3月至2016年3月在贝加尔湖南部盆地深水部分(深度1366米)安装的沉积物捕集器的实验结果，以研究湖泊内的近期沉积。我们提供了全年和个别时期在不同水柱深度的颗粒物总通量和生物组分(SiO2biog， Сorg和Ntot)通量的新数据。对所有获得的样品进行硅藻分析。沉积物质总通量平均为94.9 g/m2/y;SiO2biog、Сorg和Ntot的平均通量分别为23.9、11.6和0.94 g/m2/y。摩尔C/N比值在11 ~ 21之间变化，表明几乎所有样品中都以异质物质为主。2015年6月20日至7月20日记录了沉积物的最大通量。这个时期对应于Synedra acus种类硅藻的开花。在本年度所采集的所有样本中，这一种类的硅藻含量占总硅藻含量的60%至94%。最近Synedra acus在南贝加尔湖的水柱以及表层底泥中占主导地位，可能是由于气候变暖。

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

Russian Geology and Geophysics 地学-地球科学综合

CiteScore

2.00

自引率

18.20%

发文量

审稿时长

4-8 weeks

期刊介绍： The journal publishes original reports of theoretical and methodological nature in the fields of geology, geophysics, and geochemistry, which contain data on composition and structure of the Earth''s crust and mantle, describes processes of formation and general regularities of commercial mineral occurrences, investigations on development and application of geological-geophysical methods for their revealing. As to works of regional nature, accelerated publication are available for original papers on a variety of problems of comparative geology taking into account specific character of Siberia, adjacent Asian countries and water areas. The journal will also publish reviews, critical articles, chronicle of the most important scientific events, and advertisements.