Series advances made by Key Laboratory of Global Change and Marine-Atmospheric Chemistry (GC-MAC)
- An important research paper entitled “Methane production in toxic seawater of the western North Pacific and its marginal seas” was recently published in Limnology and Oceanography (IF: 3.778 ), in October 2020. This work was accomplished by the cooperation between scientists from GC-MAC and Ocean University of China, with Dr. Ye Wang-Wang as the first author. The paper focused on the mechanism of toxic methane production in the marginal seas of China, revealing the precursors, the involved bacteria, and the key controlling factors from a multidisciplinary perspective, which deeply help us to understand the “Oceanic Methane Paradox”. Dr. Wang Xiao-Lei from the Laboratory of Marine Biology and Ecology, is the co-author of this paper, showing the importance of multidisciplinary crossover for the study of greenhouse gases and global change.
Figure 1 CH4 production and microbial assemblage in coastal waters (Yellow Sea) amended with MPn. (a) CH4 production over time, (b) oxygen consumption over time, (c) cell densities, and (d) changes in microbial composition
- Another paper entitled “High-resolution distribution pattern of surface water nitrous oxide along a cruise track from the Okhotsk Sea to the western Arctic Ocean” was published online in Limnology and Oceanography, in October 2020. Dr. Zhan Li-Yang from TIO-GCMAC is the first and corresponding author, who cooperated with the scientists from the University of Delaware and the China Polar Research Center. This study analyzed the distribution of nitrous oxide along the Okhotsk, Bering Sea, Chukchi Sea, and the Canada basin by using a self-assembling system for continuous underway observation. Results showed that the study area was the source of atmospheric nitrous oxide. After analysis of ice cover distribution, hydrography, and other parameters (pCO2), the authors concluded that the distribution of nitrous oxide was influenced by mixing, upwelling, and in situ production under the ice sheet. Besides, the ice melting plays an important role in diluting the dissolved nitrous oxide.
Figure 2 The study area and the cruise track along the Okhotsk Sea to the western Arctic Ocean
- The third paper entitled “Spatial and temporal patterns of methane and its influencing factors in the Jiulong River estuary, southeastern China” was published online in Marine Chemistry (IF: 2.933 ), in December 2020. The R.A. Li Yu-Hong and Dr. Zhan Li-Yang from GC-MAC were the first author and corresponding author, respectively. This paper analyzed the methane distribution in the Jiulong River estuary along different frontiers of salinity and tides, which found the high methane concentration and sea-air flux during the spring-tide period. The results of continuous observation in the fixed stations showed the important effect of tides on the methane and other parameters. The saturation and sea-air fluxes of methane in the Jiulong River estuary were higher than that in other estuaries all over the world, indicates that continuous observation should be conducted in this area and the data can be supplied to the decision-maker for comprehensive management in the future.
Figure 3 The distribution of different parameters (temperature, salinity, turbidity, oxygen, methane concentration, and sea-air flux) in the Jiulong River estuary
The research progress from the GC-MAC covered an overall area of the estuary, the marginal seas, and the Polar Regions. These results showed temporal-spatial variations of greenhouse gases in those areas by analysis of distribution, flux, and mechanism for migration and transformation. These works will provide a significant scientific basis for evaluating greenhouse gas releasing and the subsequent global change.
These studies were supported by the Chinese Projects for Investigations and Assessments of the Arctic and Antarctic, the National Key Research and Development Program of China, the National Natural Science Foundation of China, the China-ASEAN Maritime Cooperation Fund Project, the Scientific Research Foundation of Third Institute of Oceanography, MNR.
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