Temporal variations in nitrogen isotope offsets between bulk sediment and planktonic foraminifera in the South China Sea linked to redox changes over the past 500 kyr - Li-Wei Zheng; Yao Lai; Xiaodong Ding; Ehui Tan; Xufeng Zheng; Zhixiong Huang; Zhenzhen Zheng; Shuh-Ji Kao (Quaternary Science Reviews, 2025)