期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 752, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.141756
关键词
Volatile halocarbons; Distribution; Sea-to-air fluxes; Changjiang Estuary; Mesocosm experiment; Ocean acidification
资金
- Key Project of the National Natural Science Foundation of China [41830534]
- National Key Research and Development Program of China [2016YFA0601304]
- National Natural Science Foundation of China [41506088]
- Fundamental Research Funds for the Central Universities [201762030]
The study found that the concentrations of volatile halocarbons in the Changjiang Estuary and adjacent waters were influenced by various factors; their vertical distributions were determined by the mixing of water masses; VHCs were positively correlated with salinity and nutrient availability; and the study area was a net source of these trace gases.
The volatile halocarbons (VHCs) CH3I, C2HCl3, C2Cl4, and CH2Br2 were measured in the Changjiang Estuary and adjacent waters during autumn 2018. Results revealed that their concentrations in coastal waters were influenced by anthropogenic activities, biological release, and complex hydrographic features. The vertical distributions of VHCs were determined mostly by the mixing of water masses. By investigating the impacts of temperature, salinity, chlorophyll a, nutrients, and pH on the distributions of these trace gases we revealed that C2HCl3 and C2Cl4 were positively correlated with salinity and nutrient availability. The sea-to-air fluxes of CH3I, C2HCl3, C2Cl4, and CH2Br2 were estimated to be 27.62, 280.3, 221.73, and 142.41 nmol m(-2) day(-1), respectively, suggesting that the study area was a net source of these trace gases. The impact of elevated fCO(2) on the production of the four volatile halocarbons was studied using mesocosms in Wu Yuan Bay, Xiamen. The results showed that elevated fCO(2) had little impact on the VHCs. Positive relationships were observed between CH2Br2 and phytoplankton biomass when fCO(2) was low, and between CH3I and phytoplankton biomass when fCO(2) was high, suggesting that algal release was a significant source of both compounds. (C) 2020 Published by Elsevier B.V.
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