Wei Yuqiu, Song Lun, Ma Yuanqing, Mu Jiandong, Yi Wei, Sun Jun, Qu Keming, Cui Zhengguo
State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, China; Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, China.
Key Laboratory of Marine Biological Resources and Ecology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, China.
J Hazard Mater. 2024 Sep 15;477:135305. doi: 10.1016/j.jhazmat.2024.135305. Epub 2024 Jul 22.
At present, a clear dependency of the dynamics upon temperature and pH has not been established for many heavy metals (HMs), so making it difficult to project and quantify the impact of ocean warming and acidification on metal biogeochemistry in future scenarios. To understand the responses of HMs to future ocean warming and acidification, we estimated the spatial-temporal variations and pollution status of six dissolved HMs (i.e., Cu, Zn, Pb, Cd, Hg, and As) in surface seawater throughout the Bohai Sea during 2012-2014. The results showed that the average concentrations of Cu, Zn, Pb, Cd, Hg, and As in seawater of the Bohai Sea were between 2.01-3.18, 10.47-15.58, 0.85-2.31, 0.25-0.55, 0.05-0.13, and 1.24-1.98 μg L, respectively. Spatially, the average concentrations of the studied HMs generally decreased from the three bays towards the central area, except for Hg which was relatively high in the central Bohai Sea in some cases. This implied that, in addition to continental inputs, there may be other processes affecting the distribution pattern of Hg, such as cyclonic or anticyclonic gyres, benthic fluxes between surface and bottom layers, and some marine planktonic and microbial activities. The pollution assessments of six HMs in seawater revealed that the major risk pollutants were Pb and Hg across the Bohai Sea. Analyses of the local and interactive effects of temperature and pH on HMs showed that the interactive effect of changing temperature and pH on HMs is much more complex than a direct temperature/pH relationship with HMs. Altogether, the results suggested that future ocean warming and acidification will significantly influence the concentrations of dissolved HMs in seawater of the Bohai Sea, but with different relationships.
目前，许多重金属（HMs）的动力学对温度和pH的明确依赖性尚未确定，因此难以预测和量化未来情景下海洋变暖和酸化对金属生物地球化学的影响。为了解重金属对未来海洋变暖和酸化的响应，我们估算了2012 - 2014年期间渤海表层海水中六种溶解态重金属（即铜、锌、铅、镉、汞和砷）的时空变化及污染状况。结果表明，渤海海水中铜、锌、铅、镉、汞和砷的平均浓度分别在2.01 - 3.18、10.47 - 15.58、0.85 - 2.31、0.25 - 0.55、0.05 - 0.13和1.24 - 1.98μg/L之间。在空间上，除汞在某些情况下渤海中部相对较高外，所研究重金属的平均浓度总体上从三个海湾向中心区域降低。这意味着，除了陆地输入外，可能还有其他过程影响汞的分布格局，如气旋或反气旋环流、表层和底层之间的底栖通量以及一些海洋浮游生物和微生物活动。海水中六种重金属的污染评估表明，渤海的主要风险污染物是铅和汞。温度和pH对重金属的局部和交互作用分析表明，温度和pH变化对重金属的交互作用比与重金属的直接温度/pH关系更为复杂。总之，结果表明未来海洋变暖和酸化将显著影响渤海海水中溶解态重金属的浓度，但关系各异。
