동해의 용존 메탄과 탄소 동위원소비

Title
동해의 용존 메탄과 탄소 동위원소비
Alternative Title
Dissolved methane and its carbon isotope ratio in the Japan Sea (East Sea)
Author(s)
Toshitaka Gamo; Urumu Tsunogai; Akinari Hirota; 강동진; 김경렬
KIOST Author(s)
Kang, Dong Jin(강동진)
Publication Year
2010-09-12
Abstract
Vertical profiles of dissolved methane (CH4) and its carbon isotope ratio (13C/12C or 13C) as background values were measured from surface to bottom for the first time in the three major basins of the Japan Sea (East Sea): eastern Japan Basin, Yamato Basin, and Ulleung Basin. Seawater samples were taken using a CTD-Carousel multi-sampling system during the R/V Tansei Maru KT-07-24 cruise in 2007 as a Japan-Korea collaborative study. CH4 concentration and its 13CPDB were measured using a CF-IRMS at Hokkaido University. While the CH4 concentrations of surface seawater are 2.6-2.9 nmol kg-1 (13C: -48‰), those at 30-150 m depths show a distinct maximum with the concentration of 4.1-8.5 nmol kg-1 (with the minimum 13C value of -57‰), indicating in situ microbial CH4 production in some anoxic microenvironments. Below the subsurface maximum, CH4 decreases with depth toward a minimum value of about 1 nmol kg-1 at ~1,500 m depth. Then CH4 gradually increases toward the bottom (especially in the Yamato and Ulleung Basins), accompanied by a decrease of the 13C, suggesting biogenic CH4 supply from bottom sediment. Differences in the CH4 and its 13C profiles are recognized among the three basins, probably reflecting a balance between the CH4 consumption and the CH4 flux from seafloor, in association with the abyssal seawater circulation.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/28773
Bibliographic Citation
5th PEACE Workshop, pp.137 - 143, 2010
Publisher
Program of the East Asian Cooperative Experiments (PEACE)
Type
Conference
Language
English
Publisher
Program of the East Asian Cooperative Experiments (PEACE)
Related Researcher
Research Interests

Chemical Oceanography,Dissolved Gas in seawater,Development of Instruments,화학해양학,해수용존기체,관측장비개발

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