[Migration and transformation of marine carbon and related chemical driving factors].
The study showed that the migration and transformation of marine carbon had a close relation with the biogeochemical processes driven by various chemical factors. The growth and decline of nutrient concentration, pH, dissolved oxygen (DO), redox potential (Eh), SO4(2-), and sulfur potential (Es) could change marine chemical environment, and thus, affect the migration and transformation of marine carbon. When the nutrient supply was adequate to the nutritional demand of phytoplankton, CO2 was conveyed to deep sea through photosynthesis and organic matter oxidation, which caused the decrease of sea water Pco2 and the increase of sea-air CO2 flux and organic carbon output, making the sea area as a CO2 sink. But, the increasing acidification of marine environment caused by CO2 dissolution and organic matter degradation brought about the solubility augmentation of carbonate in seawater. Moreover, the mineralization of organic carbon was coupled with the changes of DO, Eh, SO4(2-) and Es, and the deposition and burial process of carbon in sediments. In sea water body, high DO and high Eh accelerated the transformation from inorganic carbon to organic carbon, while in sediment, high SO4(2-) was adverse to the burial of organism with low DO and low Eh.
Zheng
Guoxia
G
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China. lingxunai@sina.com
Song
Jinming
J
Dai
Jicui
J
D002244:Carbon / Q000032:analysis*; D017554:Carbon Compounds, Inorganic / Q000032:analysis*; D002245:Carbon Dioxide / Q000032:analysis*; D017753:Ecosystem; D004784:Environmental Monitoring; D009792:Oceans and Seas; D010839:Phytoplankton / Q000502:physiology; D012623:Seawater / Q000737:chemistry*
D017554:Carbon Compounds, Inorganic; D002245:Carbon Dioxide; D002244:Carbon