Journal
MARINE POLLUTION BULLETIN
Volume 191, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2023.114873
Keywords
Chl; CH 4 concentration; Nutrients; Haima cold seeps; Qiongdongnan Basin
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Cold seeps are an important source of methane in the ocean. This study analyzed the variations in Chl-alpha, nutrients, environmental parameters, and CH4 concentrations in the overlying water of Haima cold seeps. The results showed that the overlying water had low nutrient and low Chl-alpha levels, but phosphate and Chl-alpha were significantly elevated in the cold seeps compared to control stations. Spearman correlation analysis indicated that Chl-alpha in cold seep was positively correlated with salinity and negatively correlated with nutrient and CH4 concentrations.
Cold seeps are a significant source of methane to the ocean. However, nutrients and Chl-alpha in the euphotic layer overlying cold seeps have been poorly studied. Variations in Chl-alpha, nutrients, environmental parameters, and CH4 concentrations in the Haima cold seeps were analyzed. Results show that the overlying water exhibits a typical low nutrient and low Chl-alpha marine environment. Phosphate and Chl-alpha were significantly elevated, and the average SCM in cold seeps was much higher than that in control stations. Spearman correlation analysis indicated Chl-alpha in cold seep was positively correlated with salinity and negatively with nutrient and CH4 concentrations. It implied that the CH4 concentrations may promote the increase of Chl-alpha, and may be linked to CH4 plumes, bringing cold, nutrient-rich waters to the thermocline. However, due to the CH4 plumes hardly to track, more sampling is needed to determine the effects on Chl-alpha and phytoplankton in the euphotic layer.
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