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Methane Oxidation in the Water Column of Xiangxi Bay, Three Gorges Reservoir
Author(s) -
Lei Dan,
Liu Jia,
Zhang Junwei,
Lorke Andreas,
Xiao Shangbin,
Wang Yuchun,
Wang Wei,
Li Ye
Publication year - 2019
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201800516
Subject(s) - bay , water column , three gorges , tributary , flux (metallurgy) , environmental science , methane , atmosphere (unit) , water level , hydrology (agriculture) , environmental chemistry , chemistry , oceanography , meteorology , geology , geography , geotechnical engineering , cartography , organic chemistry
Four field campaigns are carried out to quantify the methane (CH 4 ) oxidation rate in Xiangxi Bay (XXB) of the Three Gorges Reservoir (TGR), China. The water depth of the sampling site varied from 13 to 30 m resulting from the water level fluctuation of the TGR. The CH 4 oxidation rates are measured in situ as the decline of dissolved CH 4 concentration versus time in incubated, and those rates. The CH 4 oxidation rates range from 1.18 × 10 −3 to 3.69 × 10 −3 µmol L −1 h −1 , with higher values and stronger variation during summer. A static floating chamber method is used to measure CH 4 emitted to the atmosphere resulting in an annual mean flux of 4.79 µmol m −2 h −1 . The CH 4 emission rate is significantly negatively correlated with the water level. The results show that a large fraction of CH 4 is consumed in the water column with a range of 28.97–55.90 µmol m −2 h −1 , accounting for ≈69–98% of the total CH 4 input into the water column, and more than 90% is consumed outside the summer, when the water level is lowest. Water depth, which is dominated by water level of the TGR, is a potentially important driver for CH 4 oxidation and atmospheric emission in the tributary bay.