The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 959, P. 178176 - 178176
Published: Dec. 20, 2024
Language: Английский
Permafrost and Periglacial Processes, Journal Year: 2024, Volume and Issue: unknown
Published: Oct. 23, 2024
ABSTRACT Increasing greenhouse gas levels drive extensive changes in Arctic and cold‐dominated environments, leading to a warmer, more humid, variable climate. Associated permafrost thaw creates new groundwater flow paths cold regions that are causing unprecedented environmental changes. This review of recent advances research environments has revealed paradigm is emerging where at the center these Groundwater associated heat solute transport now used as basis understand hydrological changes, dynamics, water quality, integrity infrastructure along with ecological impacts. Although major have been achieved regions' cryohydrogeological research, remaining knowledge gaps numerous. For example, drinking source poorly documented despite its social importance. Lateral processes for carbon contaminants still inadequately understood. Numerical models improving, but highly complex physical‐ecological occurring arctic involve coupled thermal, hydrological, hydrogeological, mechanical, geochemical difficult represent hamper quantitative analysis limit predictive capacity. Systematic long‐term observatories measurements involving considered central needed help resolve gaps. Innovative transdisciplinary will be critical comprehend predict transformations.
Language: Английский
Citations
0
Environment International, Journal Year: 2024, Volume and Issue: 193, P. 109127 - 109127
Published: Nov. 1, 2024
Monomethylmercury (MMHg) is a potent neurotoxin that poses threat to human health. MMHg cycles in all spheres of the Earth but sources and fate atmospheric are unclear. Here, we develop global model for MMHg, which integrates presently available data indicates limitations current study. Constrained by observations atmosphere, from 1009 (205-2474 as an uncertainty range) Mg/yr, with largest in-cloud methylation divalent mercury (475 Mg/yr) sea spray (395 Mg/yr). has short lifetime 1.9 days troposphere due rapid photo-demethylation. Our net loss marine atmosphere thus detoxifying effect on contamination fish. However, it suggests additional deposition land, particularly densely populated coastal areas, introducing new risk pathway needs be considered exposure assessment. The plays non-negligible role biogeochemical cycle health, requires further study consideration implementing Minamata Convention.
Language: Английский
Citations
0
Environmental Research, Journal Year: 2024, Volume and Issue: 264, P. 120333 - 120333
Published: Nov. 14, 2024
A notable greening and warming of the Arctic Subarctic due to climate change has uncertain implications for global cycling mercury (Hg). Snowpacks are dynamic reservoirs Hg susceptible solar radiation wind pumping, with vegetative cover potentially altering photochemistry. However, impact northern on transformation major species stocks remain poorly understood. Temporal surface snow snowpit sampling was conducted under tree canopies open tundra sites at boreal-tundra ecotone in Nunavik, Canada. Maximum (mean) concentrations 69.1 ng/L (8.8 ng/L) total (HgT) 46.9 (5.5 reactive (HgR) were measured forest snow, maximums attributed rapid atmospheric oxidation events. Significant post-depositional reductions recorded bay, tundra, (67-99% HgR) suggested greater sequestration may occur canopies. Increasing methylmercury (MeHg), HgT, dissolved organic carbon (DOC) detected across a vegetation gradient shifting towards humic-like matter. Notably, springtime depth profiles presented an approximate 12-fold accumulation HgT compared (p < 0.01), up 16-times higher (HgT, MeHg, DOC) elevated density 0.05). In North, increasing favor methylation snowpacks, facilitated by interactions matter, further enriched reduced exposure experienced
Language: Английский
Citations
0
ACS ES&T Water, Journal Year: 2024, Volume and Issue: 5(1), P. 20 - 32
Published: Dec. 10, 2024
Metals are ubiquitous in Earth's Critical Zone and play key roles ecosystem function, human health, water security. They essential nutrients at low concentrations, yet some metals toxic a high dose. Permafrost thaw substantially alters all the physical chemical processes governing metal mobility, including movement solute transport (bio)geochemical interactions involving water, organic matter, minerals, microbes. The outcomes of these interconnected changes nonintuitive hold global implications for resources health. This Perspective outlines primary factors affecting mobility thawing permafrost underscores urgent need priorities interdisciplinary research to better understand this emerging issue.
Language: Английский
Citations
0
The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 959, P. 178176 - 178176
Published: Dec. 20, 2024
Language: Английский
Citations
0