Sources and sinks driving sulfuric acid concentrations in contrasting environments: implications on proxy calculations

Atmospheric chemistry and physics, Journal Year: 2020, Volume and Issue: 20(20), P. 11747 - 11766

Published: Oct. 19, 2020

Abstract. Sulfuric acid has been shown to be a key driver for new particle formation and subsequent growth in various environments, mainly due its low volatility. However, direct measurements of gas-phase sulfuric are oftentimes not available, the current proxies cannot predict, example, nighttime concentrations or result significant discrepancies with measured values. Here, we define sources sinks different environments derive physical proxy utilized locations during periods when it is measured. We used H2SO4 from four locations: Hyytiälä, Finland; Agia Marina, Cyprus; Budapest, Hungary; Beijing, China, representing semi-pristine boreal forest, rural environment Mediterranean area, urban heavily polluted megacity, respectively. The takes into account SO2 via OH oxidation other pathways, specifically stabilized Criegee intermediates. included condensation sink (CS) atmospheric clustering starting dimer formation. Indeed, found that observed concentration can explained by proposed similar coefficients contrasting where have tested it. Thus, more flexible an important improvement over previous proxies. Following recommendations this paper, specific location derived.

Language: Английский

---

Influences of Recent Particle Formation on Southern Ocean Aerosol Variability and Low Cloud Properties

Journal of Geophysical Research Atmospheres, Journal Year: 2021, Volume and Issue: 126(8)

Published: March 26, 2021

Abstract Controls on pristine aerosol over the Southern Ocean (SO) are critical for constraining strength of global indirect forcing. Observations summertime SO clouds and aerosols in synoptically varied conditions during 2018 SOCRATES aircraft campaign reveal novel mechanisms influencing aerosol‐cloud interactions. The free troposphere (3–6 km) is characterized by widespread, frequent new particle formation events contributing to much larger concentrations (≥1,000 mg −1 ) condensation nuclei (diameters > 0.01 μm) than typical sub‐tropical regions. Synoptic‐scale uplift warm conveyor belts sub‐polar vortices lifts marine biogenic sulfur‐containing gases free‐tropospheric environments favorable generating Aitken‐mode particles (0.01–0.1 μm). Free‐tropospheric Aitken subside into boundary layer, where they grow size dominate sulfur‐based cloud (CCN) driving droplet number ( N d ∼ 60–100 cm −3 ). Evidence presented a hypothesized ‐ buffering mechanism which maintains persistently high against precipitation removal through CCN replenishment from activation growth layer particles. Nudged hindcasts Community Atmosphere Model (CAM6) found underpredict accumulation mode , impacting brightness interactions indicating incomplete representations associated with ocean biology.

Language: Английский

---

Formation and growth of sub-3 nm particles in megacities: impact of background aerosols

Faraday Discussions, Journal Year: 2020, Volume and Issue: 226, P. 348 - 363

Published: Aug. 4, 2020

In polluted urban environments, background aerosols govern the formation and growth of sub-3 nm particles.

Language: Английский

---

Dimethyl Sulfide‐Induced Increase in Cloud Condensation Nuclei in the Arctic Atmosphere

Global Biogeochemical Cycles, Journal Year: 2021, Volume and Issue: 35(7)

Published: June 18, 2021

Abstract Oceanic dimethyl sulfide (DMS) emissions have been recognized as a biological regulator of climate by contributing to cloud formation. Despite decades research, the climatic role DMS remains ambiguous largely because limited observational evidence for DMS‐induced condensation nuclei (CCN) enhancement. Here, we report concurrent measurement DMS, physiochemical properties aerosol particles, and CCN in Arctic atmosphere during phytoplankton bloom period 2010. We encountered multiple episodes new particle formation (NPF) growth when mixing ratios were both low high. The particles sizes at which they can act accelerated response an increase atmospheric DMS. Explicitly, sequential all relevant parameters (including source rate condensable vapor, Aitken mode hygroscopicity, CCN) was pronounced DMS‐derived NPF events. This field study unequivocally demonstrates previously unconfirmed roles into climate‐relevant size eventual activation.

Language: Английский

---

Quantifying traffic, biomass burning and secondary source contributions to atmospheric particle number concentrations at urban and suburban sites

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 768, P. 145282 - 145282

Published: Feb. 2, 2021

Language: Английский

---