Study of the Profile Distribution of the Diffuse Attenuation Coefficient and Secchi Disk Depth in the Northwestern South China Sea. - Xianqing Zhang; Cai Li; Wen Zhou; Yuanning Zheng; Wenxi Cao; Cong Liu; Zhantang Xu; Yuezhong Yang; Zeming Yang; Fei Chen (Remote. Sens., 2023)