Abstract
From 28 March to 17 April, 2018, different forms of mercury (Hg) in the Yellow Sea and Bohai Sea were measured to study the influencing factors on the distribution and transformation of Hg in spring using a shared cruise. The mean concentration of dissolved gaseous mercury (DGM) in the surface water of the Yellow and Bohai Seas was (44.3 ± 43.9) pg/L, which was close to that in mid-latitude oceans and deep seas. The ratio of DGM to THg (total mercury) was lower than in the oceans and in the Yellow and Bohai Seas in summer or fall. DGM concentrations in surface water were highest in the central part of the South Yellow Sea and were higher than those in the Bohai Sea, and their spatial distributions were consistent with RHg (reactive mercury). DGM and RHg correlated positively with water temperature in surface seawater (r = 0.506, P < 0.01; r = 0.278, P < 0.05). The concentrations of both DGM and RHg in surface water were controlled by solar radiation and water temperature. Foggy weather did not benefit the production of DGM and RHg. DGM in the bottom seawater was mainly affected by Dissolved Oxygen and water temperature (r = −0.366, P < 0.01; r = 0.331, P < 0.01), produced mainly by anaerobic reactions of the bottom seawater and sediment microorganisms. The bottom DGM concentrations in the Yellow and Bohai Seas were the highest, and DGM produced in bottom seawater and sediment plays a more important role than the surface water in spring. The concentrations of DGM and RHg in the surface and bottom water in the South Yellow Sea were all higher than those in the middle layer. Vertical variations in the North Yellow Sea and the Bohai Sea were small. The production and distribution of DGM and RHg were influenced by differences of latitude and by the Yellow Sea warm current in spring.
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Acknowledgements
This cruise was conducted onboard R/V ‘Dongfanghong 2’ by Ocean University of China supported by the Oceanographic Research Vessel Sharing Plan.
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Under the auspices of the National Natural Science Foundation of China (No. 41506128), Shandong Natural Science Foundation (No. ZR2018MD004)
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Liu, R., Zheng, W., Chong, X. et al. Spatial Differences and Influencing Factors of Dissolved Gaseous Mercury in the Yellow Sea and Bohai Sea in Spring. Chin. Geogr. Sci. 31, 137–148 (2021). https://doi.org/10.1007/s11769-021-1180-1
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DOI: https://doi.org/10.1007/s11769-021-1180-1