On the trail of ocean mercury
The RV Antedon II, belonging to France’s DT INSU-CNRS research fleet. These pictures show the two environments sampled by the researchers, with the aim of applying the same methods in other marine regions.
Credit: © Lars-Eric Heimbürger-Boavida, Mediterranean Institute of Oceanography (CNRS / Aix-Marseille University / IRD / University of Toulon)
Mercury is released by coal combustion and mining activities to the atmosphere as a gaseous pollutant.
Following global dispersal, mercury deposits partly to the ocean where it accumulates within the marine food chain—with grave consequences for human health and nutrition.
A new study published in Nature on 29 September 2021 reveals that, contrary to earlier hypotheses, rainwater is not the primary deposition vector of this mercury; rather, the ocean breathes mercury, so to speak.1
This research also suggests that the ocean receives less atmospheric mercury than previously estimated, though we cannot yet assume a lower degree of contamination in fish. The Minamata Convention on Mercury,2 which went into effect in 2017, has prompted the adoption of mercury emission reduction policies that should directly impact mercury levels in the ocean and in our plates.
This study was conducted by an international team including scientists from Géosciences Environnement Toulouse (CNRS / Université Toulouse III–Paul Sabatier / CNES / IRD), the Mediterranean Institute of Oceanography (CNRS / Aix-Marseille University / IRD / University of Toulon) and the Environmental Geosciences laboratory of the University of Basel (Switzerland).
Notes
1 That is, the mercury is absorbed by the surface waters of the ocean through gas exchange.
2 The international Minamata Convention on Mercury was drafted under the aegis of the United Nations Environment Programme. It aims to protect human health and the environment from the harmful effects of mercury.
Journal: Nature
DOI: 10.1038/s41586-021-03859-8
Article Title: Mercury stable isotopes constrain atmospheric sources to the ocean
Media Contact
Alexiane Agullo
CNRS
alexiane.agullo@cnrs.fr
Original Source
https://www.cnrs.fr/en/trail-ocean-mercury
All latest news from the category: Ecology, The Environment and Conservation
This complex theme deals primarily with interactions between organisms and the environmental factors that impact them, but to a greater extent between individual inanimate environmental factors.
innovations-report offers informative reports and articles on topics such as climate protection, landscape conservation, ecological systems, wildlife and nature parks and ecosystem efficiency and balance.
Newest articles
World’s smallest molecular machine
… reversible sliding motion in ammonium-linked ferrocene. Researchers stabilized ferrocene molecules on a flat substrate for the first time, creating an electronically controllable sliding molecular machine. Artificial molecular machines, nanoscale…
Towards the control of chemical reactions
Overcoming one of the challenges of quantum mechanics: A major result in quantum mechanics has been achieved: for the first time, the temporal evolution of a quantum system has been…
Planets form through domino effect
New radio astronomy observations of a planetary system in the process of forming show that once the first planets form close to the central star, these planets can help shepherd…