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Oceanic emissions of methyl halides and effect of nutrients concentration on their production: A case of the western Pacific Ocean (2°N to 24°N). | LitMetric

Oceanic emissions of methyl halides and effect of nutrients concentration on their production: A case of the western Pacific Ocean (2°N to 24°N).

Sci Total Environ

Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China.

Published: May 2021

AI Article Synopsis

  • Methyl halides are significant greenhouse gases that contribute to ozone depletion, and this study focused on their presence in the western Pacific Ocean.
  • The research found that atmospheric methyl halides likely originated from Southeast Asia, with seawater concentrations mainly produced from dissolved organic carbon influenced by sunlight.
  • Nutrient enrichment in ship experiments increased methyl halide emissions linked to phytoplankton proliferation, although the overall contribution of these gases from the western Pacific to global emissions is relatively small.

Article Abstract

Methyl halides are important greenhouse gases responsible for the majority of the ozone layer depletion. This study investigated atmospheric and seawater methyl halides (CHCl, CHBr, and CHI) in the western Pacific Ocean between 2°N and 24°N. Increases in methyl halides in the atmosphere were likely to have originated from Southeast Asian regions. Elevated CHI concentrations in seawater were mainly produced photochemically from dissolved organic carbon. Maximum methyl halide and chlorophyll a levels in the upper water column (0-200 m) were linked to biological activity and downwelling or upwelling caused by cold and warm eddies. Ship-based incubation experiments showed that nutrient supplementation promoted methyl halide emissions. The elevated methyl halide production was associated with increases in phytoplankton such as diatoms. The mean fluxes of CHCl, CHBr, and CHI in study area of during the cruise were 82.91, 4.70, and 3.50 nmol m d, respectively. The estimated emissions of CHCl, CHBr, and CHI in the western Pacific Ocean accounted for 0.67%, 0.79% and 0.09% of global oceanic emissions, respectively, indicating that the open sea contribute insignificantly to the global oceanic emissions of these gases.

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Source
http://dx.doi.org/10.1016/j.scitotenv.2020.144488DOI Listing

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