Nitrogen fixation changes regulated by upper-water structure in the South China Sea during the last two glacial cycles

Chen Li1, Zhimin Jian1, Haowen Dang2, Guodong Jia3 and Jianxin Wang1, (1)Tongji University, Shanghai, China, (2)Tongji University, Shanghai, China, (3)Guangzhou Institute of, Guangzhou, China