Environmental Pollution, Год журнала: 2024, Номер 363, С. 125104 - 125104
Опубликована: Окт. 30, 2024
Язык: Английский
Science Advances, Год журнала: 2025, Номер 11(2)
Опубликована: Янв. 8, 2025
Mercury (Hg) is a global pollutant with substantial risks to human and ecosystem health. By upward transport in tropical regions, mercury enters into the stratosphere, but contribution of stratosphere dispersion deposition remains unknown. We find that between 5 50% (passing through 400-kelvin isentropic surface tropopause, respectively) mass deposited on Earth’s chemically processed lower stratosphere. Our results show as unique chemical environment where elemental efficiently converted long-lived oxidized species. Subsequent downward contributes substantially burden troposphere. The facilitates large amounts from polluted source regions remote environments. stratospheric important tropospheric interhemispheric dispersion. Future projections suggest expected changes atmospheric circulation will increase
Язык: Английский
Процитировано
1
The Science of The Total Environment, Год журнала: 2025, Номер 964, С. 178278 - 178278
Опубликована: Янв. 23, 2025
Язык: Английский
Процитировано
0
Atmospheric Environment, Год журнала: 2025, Номер unknown, С. 121097 - 121097
Опубликована: Фев. 1, 2025
Язык: Английский
Процитировано
0
Environmental Science & Technology Letters, Год журнала: 2025, Номер unknown
Опубликована: Апрель 5, 2025
Язык: Английский
Процитировано
0
TrAC Trends in Analytical Chemistry, Год журнала: 2025, Номер unknown, С. 118257 - 118257
Опубликована: Апрель 1, 2025
Язык: Английский
Процитировано
0
Geoscientific model development, Год журнала: 2025, Номер 18(9), С. 2747 - 2860
Опубликована: Май 16, 2025
Abstract. The Multi-Compartment Hg (mercury) Modeling and Analysis Project (MCHgMAP) is an international multimodel research initiative intended to simulate analyze the geospatial distributions temporal trends of environmental inform effectiveness evaluations two multilateral agreements (MEAs): Minamata Convention on Mercury (MC) Long-Range Transboundary Air Pollution (LRTAP). This MCHgMAP overview paper presents its science objectives, background, rationale; experimental design (multimodel ensemble (MME) architecture, inputs evaluation data, simulations, reporting framework); methodologies for analysis simulated levels. primary goals project are facilitate detection attribution recent (observed) future (projected) spatial patterns global levels identification key knowledge gaps in modeling improve cycles MEAs. current advances challenges models, emission inventories, observational data examined, optimized introduced address policy questions A common set emissions, conditions, observation datasets proposed (where possible) enhance MME comparability. novel harmonized simulation approach between atmospheric, land, oceanic, multimedia models account short- long-term changes secondary exchanges achieve mechanistic consistency across matrices. comprehensive model experiments prioritized ensure systematic participation a variety from scientific community.
Язык: Английский
Процитировано
0
Atmospheric chemistry and physics, Год журнала: 2024, Номер 24(16), С. 9615 - 9643
Опубликована: Авг. 30, 2024
Abstract. Mercury (Hg) is a global atmospheric pollutant. In its oxidized form (HgII), it can readily deposit to ecosystems, where may bioaccumulate and cause severe health effects. High HgII concentrations are reported in the free troposphere, but spatiotemporal data coverage limited. Underestimation of by commercially available measurement systems hinders quantification Hg cycling fate. During spring–summer 2021 2022, we measured elemental (Hg0) using calibrated dual-channel system alongside trace gases, aerosol properties, meteorology at high-elevation Storm Peak Laboratory (SPL) above Steamboat Springs, Colorado. Oxidized displayed diel episodic behavior similar previous work SPL were approximately 3 times higher magnitude due improved accuracy. We identified 18 multi-day events elevated (mean enhancement 36 pg m−3) that occurred dry air ± SD relative humidity = 32 16 %). Lagrangian particle dispersion model (HYSPLIT–STILT, Hybrid Single-Particle Integrated Trajectory–Stochastic Time-Inverted Transport) 10 d back trajectories showed majority transport prior low middle troposphere. was anticorrelated with Hg0 during events, an average (± SD) slope −0.39 0.14. posit event resulted from upwind oxidation followed deposition or cloud uptake transport. Meanwhile, sulfur dioxide measurements verified three coal-fired power plants did not influence ambient SPL. Principal component analysis consistently inversely related generally associated combustion tracers, confirming clean, troposphere as primary origin.
Язык: Английский
Процитировано
2
Atmospheric Pollution Research, Год журнала: 2024, Номер 15(12), С. 102326 - 102326
Опубликована: Окт. 5, 2024
Язык: Английский
Процитировано
1
Опубликована: Дек. 10, 2024
Multiple field studies have led to suggestions that nitrate radical (NO3) participates in oxidizing gaseous Hg(0) the atmosphere. These suppositions are hard reconcile with two-step mechanism of conversion Hg(II) via Hg(I), due instability NO3-Hg(I). We use a high level computational chemistry determine its bond energy as 6.5 kcal mol-1. statistical mechanics compute equilibrium constant, Kc(T) for NO3 + = NO3Hg(I), and box model investigate study laboratory kinetic investigation this chemistry. Under conditions one showing correlation between [NO3] [Hg(II) (g)] , could not contributed significantly formation Hg(II). In addition, we find experimental reaction does constrain rate constant.
Язык: Английский
Процитировано
1
Environmental Pollution, Год журнала: 2024, Номер 363, С. 125104 - 125104
Опубликована: Окт. 30, 2024
Язык: Английский
Процитировано
0