Spatiotemporal distribution, controlling factors, and ecological risks of heavy metals (Cd, Pb, Cr, Zn) in the water column of the Bohai Sea - Xiaofeng Wang; Ying Li; Yuxi Lu; Lujian Li; Peigang Zhang; Xuekun Chen; Zhi Zhao; Zhengwen Zhou; Zhengpeng Zhao; Dawei Pan (Regional Studies in Marine Science, 2026)