Journal
MARINE POLLUTION BULLETIN
Volume 167, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2021.112349
Keywords
Particulate organic matter; Stable isotope; Isotope ratio; Eastern Hainan Island; Upwelling
Funding
- Scientific Research StartUp Foundation of Shantou University [NTF20006]
- Guangdong Natural Science Foundation of China [2016A030312004]
- National Natural Science Foundation of China [U1901213, 40876005, 41676008]
- Project of Enhancing School with Innovation of Guangdong Ocean University [GDOU2016050260, 230419097]
- Guangdong Ocean University [R19007]
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The study revealed that during summer, suspended particulate organic matter (POM) off the east coast of Hainan Island in the South China Sea is influenced by coastal upwelling, coastal current, and freshwater discharge. Stable isotope analysis can reflect the sources of POM and their cycling in the marine ecosystem.
The isotopic compositions (613C and 615N) and C/N ratios of suspended particulate organic matter (POM) were investigated off the east coast of Hainan Island in the South China Sea during summer. Coastal upwelling influenced the nearshore stations of transects S2 and S3, and higher 613C and 615N values suggested that coastal upwelling played a significant role in determining the POM sources. The POM at the nearshore area of transect S1 was controlled by the coastal current and freshwater discharge. Additionally, organic matter may be transported to the offshore area via tidal movements in transects S1 and S3. Based on the stable isotope analysis in an R model, the marine organic matter contribution in the upwelling area (19%) was higher than that in the other areas (transect S1 and the offshore area) (7%). The 613C and 615N values and C/N ratios reflect the carbon and nitrogen sources and their cycling in the upwelling zone off the east coast of Hainan Island.
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