首页|Concentration maxima of methane in the bottom waters over the Chukchi Sea shelf: implication of its biogenic source

Concentration maxima of methane in the bottom waters over the Chukchi Sea shelf: implication of its biogenic source

扫码查看
原文链接
  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
Knowledge about the distribution of CH4 remains insufficient due to the scarcity of data in the Arctic shelves. We conducted shipboard observations over the Chukchi Sea shelf (CSS) in the western Arctic Ocean in September 2012 to obtain the distribution and source characteristics of dissolved CH4 in seawater. The oceanographic data indicated that a salinity gradient generated a pronounced pycnocline at depths of 20–30 m. The vertical diffusion of biogenic elements was restricted, and these elements were trapped in the bottom waters. Furthermore, high CH4 concentrations were measured below the pycnocline, and low CH4 concentrations were observed in the surface waters. The maximum concentrations of nutrients simultaneously occurred in the dense and cold bottom waters, and significant correlations were observed between CH4 and 23SiO -, 34PO -, 2NO-, and 4NH+(p< 0.01, n= 44). These results suggest that the production of CH4 in the CSS has a similar trend as that of nutrient regeneration and is probably associated with the degradation of organic matter. The high primary productivity and high concentration of organic matter support the formation of biogenic CH4 in the CSS and the subsequent release of CH4 to the water column.

Chukchi Sea shelfmethanesourcesnutrientorganic carbonorganic matter

LI Yuhong、ZHANG Jiexia、YE Wangwang、JIN Haiyan、ZHUANG Yanpei、ZHAN Liyang

展开 >

Key Laboratory of Global Change and Marine–Atmospheric Chemistry(GCMAC)of Ministry of Natural Resources(MNR),Third Institute of Oceanography(TIO),MNR,Xiamen 361005,China

Laboratory of Marine Ecosystem and Biogeochemistry,Second Institute of Oceanography,MNR,Hangzhou 310012,China

Polar and Marine Research Institute,Jimei University,Xiamen 361021,China

Scientific Research Foundation of the Third Institute of Oceanography,MNRScientific Research Foundation of the Third Institute of Oceanography,MNRScientific Research Foundation of the Third Institute of Oceanography,MNR福建省自然科学基金

2022011201803120180242020J01102

2022

10.13679/j.advps.2022.0095

极地科学进展(英文版)
中国极地研究中心,国家海洋局极地考察办公室 (Polar Research Institute of China, Chinese Arctic and Antarctic Administration)

极地科学进展(英文版)

CSCD
影响因子：0.145
ISSN：1674-9928
年,卷(期)：2022.33(3)
  • 54