Radiocarbon in Dissolved Organic and Inorganic Carbon of the South China Sea
Ling Ding, Yuanzhi Qi, Sen Shan, Tiantian Ge, Chunle Luo, Xuchen Wang
Abstract
Abstract We present the carbon isotope ( 14 C and 13 C), dissolved inorganic carbon (DIC), and dissolved organic carbon (DOC) concentration measurements in the South China Sea (SCS) to reveal the different sources and cycling time scales of the two major carbon pools in the SCS. The DIC concentrations ranged from 1,776 to 2,328 μmol kg −1 , and they were lower at the surface and increased with depth. Conversely, the DOC concentrations ranged from 38 to 95 μM, and they were higher on the surface and decreased rapidly in the upper 500‐m water depth. The DIC Δ 14 C and DOC Δ 14 C values varied from −227‰ to 68‰ and −557‰ to −258‰, respectively, and both decreased with depth until 1,500 m and then remained relatively constant. DOC Δ 14 C values were −330‰ lower than DIC Δ 14 C, indicating that DOC has cycled for much longer than DIC in the SCS. The lower Δ 14 C‐DIC and Δ 14 C‐DOC values at depths shallower than 700 m were mainly influenced by intensified vertical mixing, which upwelled the deep water with low Δ 14 C‐DIC and Δ 14 C‐DOC values for thorough mixture with the upper layer water. Conversely, the small difference in the Δ 14 C signature in deep water (>1,500 m) between the SCS and the North Pacific confirmed the rapid water exchange through the Luzon Strait and rapid water mixing in the SCS basin, which plays an important role in controlling carbon cycling in the deep SCS.