Sedimentary organic matter contents and porewater chemistry at upper bathyal depths influenced by the 2011 off the Pacific coast of Tohoku Earthquake and tsunami

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• 作者：Hidetaka Nomaki ; Kazuno Arai ; Hisami Suga ; Takashi Toyofuku…
• 关键词：Turbidite ; Nutrient ; Sedimentary organic matter ; Dissolved oxygen ; Event deposit
• 刊名：Journal of Oceanography
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：72
• 期：1
• 页码：99-111
• 全文大小：884 KB
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• 作者单位：Hidetaka Nomaki (1)
  Kazuno Arai (1) (2)
  Hisami Suga (1)
  Takashi Toyofuku (1)
  Masahide Wakita (1)
  Takuro Nunoura (1)
  Kazumasa Oguri (1)
  Takafumi Kasaya (1)
  Shuichi Watanabe (1)
  
  1. Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, 237-0061, Japan
  2. Graduate School of Science, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba-Shi, Chiba, 263-8522, Japan
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Oceanography
  Hydrobiology
  
• 出版者：Springer Netherlands
• ISSN：1573-868X

文摘

Sedimentary organic matter and porewater geochemistry at upper bathyal depths off Tohoku, Japan, were investigated 1 year after the 2011 off the Pacific coast of Tohoku Earthquake. Total organic carbon (TOC) and total nitrogen (TN) concentrations, organic carbon and nitrogen isotopic compositions, dissolved oxygen (DO) concentrations, and bottom water and porewater nutrient concentrations were examined in sediment core samples collected from eight upper bathyal stations. Event deposits 1 to 7 cm thick were observed at all sampling stations, indicating that a vast area off Tohoku has been influenced by sedimentological events caused by the earthquake or subsequent tsunami. Both TOC and TN concentrations were lower in coarse-grained event deposits. Carbon and nitrogen isotopic composition, together with the C/N ratio, suggested that the event deposits, including turbidites, were composed of local sediments that had been transported relatively short distances. Nutrient fluxes across the sediment–water interface correlated with surface TOC and bottom water DO concentrations. However, event deposit thickness showed no correlation with oxygen or nutrient fluxes. The organic matter content of the event deposits was similar to that in the underlying sediments at each site, and thus no apparent effect of event deposits on nutrient fluxes was observed. Our results suggest that biogeochemical cycles in sediments of disturbed areas are affected not only by event deposit thickness, but also by the source of the event deposits. Keywords Turbidite Nutrient Sedimentary organic matter Dissolved oxygen Event deposit