Regionally sourced bioaerosols drive high-temperature ice nucleating particles in the Arctic

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Sept. 28, 2023

Primary biological aerosol particles (PBAP) play an important role in the climate system, facilitating formation of ice within clouds, consequently PBAP may be understanding rapidly changing Arctic. Within this work, we use single-particle fluorescence spectroscopy to identify and quantify at Arctic mountain site, with transmission electronic microscopy analysis supporting presence PBAP. We find that concentrations range between 10-3-10-1 L-1 peak summer. Evidences suggest terrestrial biosphere is regional source PBAP, given high correlation air temperature, surface albedo, vegetation tracers. clearly correlate high-temperature nucleating (INP) (>-15 °C), which a fraction (>90%) are proteinaceous summer, implying origin. These findings will contribute improved sources characteristics their links INP.

Language: Английский

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Linking biogenic high-temperature ice nucleating particles in Arctic soils and streams to their microbial producers

Aerosol Research, Journal Year: 2025, Volume and Issue: 3(1), P. 81 - 100

Published: Feb. 25, 2025

Abstract. Aerosols, including biological aerosols, exert a significant influence on cloud formation, influencing the global climate through their effects radiative balance and precipitation. The Arctic region features persistent mixed-phase clouds, which are impacted by ice nucleating particles (INPs) that modulate phase transitions within affecting lifetime impacting region's climate. An increasing number of studies document soils harbor numerous biogenic INPs (bioINPs), but these have yet to be linked microbial producers. In addition, transfer bioINPs from into freshwater marine systems has not been quantified. This study aimed address open questions analyzing soil samples northeast Greenland determine composition along with INP concentrations size distributions. We found contained between 3.19×104 1.55×106 g−1 soil, was lower side what previously reported for active-layer soils. varied widely across locations could originated bacterial fungal sources. detected Mortierella, genus known produce proteins, at nearly all locations. Spearman correlations taxa pointed lichenized fungi as possible contributor INP. Additionally, based distribution, we suggest were bound or membranes some locations, while other showed variety soluble different molecular sizes. streams, comparable measured in streams temperate regions. Interestingly, stream positive association concentrations. potential release aerosolization atmosphere – whether directly they washed, oceans where might transported impact formation precipitation patterns Arctic. research contributes valuable knowledge understanding communities producers highly active connectivity streams.

Language: Английский

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Bacterial Distribution in the Glacier Borehole Meltwater on the Eastern Broknes Peninsula of the Larsemann Hills and Adjacent Lake Water, East Antarctica

Microorganisms, Journal Year: 2025, Volume and Issue: 13(3), P. 679 - 679

Published: March 18, 2025

The distribution and assembly mechanisms of microorganisms in Antarctic lakes glaciers remain poorly understood, despite their ecological significance. This study investigates the bacterial diversity community composition glacier borehole meltwater samples from eastern Broknes Peninsula Larsemann Hills adjacent lake water East Antarctica using high—throughput 16S rRNA gene sequencing. results show that increased with depth, but remained lower than water. Significant compositional differences were observed between communities, higher relative abundances Actinobacteria, Bacteroidia, Cyanobacteriia, Verrucomicrobiae samples, while Alphaproteobacteria, Gammaproteobacteria, OLB14 (phylum Chloroflexi), Acidimicrobiia, Thermoleophilia more abundant samples. These attributed to distinct mechanisms: stochastic processes (ecological drift dispersal limitation) dominated lakes, both homogeneous dispersal) deterministic (homogeneous selection) played key roles boreholes. enhances our understanding patterns ecosystems, providing insights into microbial biodiversity biogeochemical cycling these extreme environments.

Language: Английский

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Terrestrial runoff is an important source of biological ice-nucleating particles in Arctic marine systems

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(6), P. 3327 - 3346

Published: March 19, 2025

Abstract. The accelerated warming of the Arctic manifests in sea ice loss and melting glaciers, significantly altering dynamics marine biota. This disruption ecosystems can lead to an increased emission biological ice-nucleating particles (INPs) from ocean into atmosphere. Once airborne, these INPs induce cloud droplet freezing, thereby affecting lifetime radiative properties. Despite potential atmospheric impacts INPs, their properties sources remain poorly understood. By analyzing bulk water surface microlayer two southwest Greenlandic fjords, collected between June September 2018, investigating along with microbial communities, we could demonstrate a clear seasonal variation number notable input terrestrial runoff. We found highest INP concentration during late stage phytoplankton bloom active processes causing enhanced These highly were smaller size less heat-sensitive than those later summer previously identified systems. A negative correlation salinity abundance suggests freshwater as source INPs. Stable oxygen isotope analysis, strong presence bacteria such Aquaspirillum arcticum, Rhodoferax, Glaciimonas, highlighted meteoric primary origin influx, suggesting that notably originate glacial soil

Language: Английский

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Airborne Bacteria over Thawing Permafrost Landscapes in the Arctic

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: April 30, 2025

Rapid warming in the Arctic, outpacing global rates, is driving significant changes cryospheric landscapes, including release of long-preserved microorganisms. This study focuses on thawing permafrost Northern Alaska, where microbes previously preserved frozen soils are introduced into thermokarst lakes, rivers, and coastal waters may also become airborne as bioaerosols. We present first microbial composition measurements bioaerosols identifying their local sources, such soils, water bodies, vegetation. Although sea/brackish dominant bioaerosol contributor, we provide evidence signatures from permafrost-laden regions. Permafrost highly enriched with ice nucleating particles (INPs), which play a crucial role cloud formation, precipitation processes, radiation budget despite relatively low atmospheric concentrations. With rising Arctic temperatures, increased thaw could result higher levels permafrost-derived biological INPs active at warmer subzero temperatures. This, turn, enhance precipitation, further accelerating thaw. Our findings emphasize complex interactions between terrestrial revealing potential feedback loop that intensify its broader environmental impacts.

Language: Английский

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Culturable Microorganisms of Aerosols Sampled during Aircraft Sounding of the Atmosphere over the Russian Arctic Seas

Atmosphere, Journal Year: 2024, Volume and Issue: 15(3), P. 365 - 365

Published: March 17, 2024

Atmospheric sounding using the Tu-134 Optik aircraft-laboratory was conducted in September 2020 over seas of Russian sector Arctic Ocean, namely Barents, Kara, Laptev, East Siberian, Chukchi and Bering seas. Unique samples atmospheric aerosols at altitudes from 200 up to 10,000 m were taken, including for identification cultivated microorganisms their genetic analysis. Data on concentration diversity bacteria fungi isolated 24 are presented; main phenotypic genomic characteristics obtained 152 bacterial cultures; taxonomic belonging determined. The cultured detected different locations similar, averaging 5.5 × 103 CFU/m3. No dependence number height location aerosol sampling observed. presence pathogenic condto shitionally bacteria, those referred genera Staphylococcus, Kocuria, Rothia, Comamonas, Brevundimonas, Acinetobacter, others, as well represented by widely spread Aureobasidium, Aspergillus, Alternaria, Penicillium, capable causing infectious allergic diseases present most analyzed samples. Obtained data reveal necessity systematic studies microbiota composition combat emerging population diseases.

Language: Английский

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Terrestrial runoff is an important source of biological INPs in Arctic marine systems

Published: July 4, 2024

Abstract. The accelerated warming of the Arctic manifests in sea ice loss and melting glaciers, significantly altering dynamics marine biota. This disruption ecosystems can lead to emission biological nucleating particles (INPs) from ocean into atmosphere. Once airborne, these INPs induce cloud droplet freezing, thereby affecting lifetime radiative properties. Despite potential atmospheric impacts INPs, their properties sources remain poorly understood. Analysing bulk water surface microlayer two southwest Greenlandic fjords, collected between June September 2018, investigating along with microbial communities, we could demonstrate a clear seasonal variation number notable input terrestrial runoff. We found highest INP concentration during late stage phytoplankton bloom active processes causing enhanced These highly were smaller size less heat-sensitive than those later summer previously identified systems. A negative correlation salinity abundance suggests freshwater as INPs. Stable oxygen isotope analysis, strong presence bacterium Aquaspirillum arcticum, highlighted meteoric primary origin influx, suggesting that notably originate such glacial soil

Language: Английский

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Rainfall effects on vertical profiles of airborne fungi over a mixed land-use context at the Brazilian Atlantic Forest biodiversity hotspot

Agricultural and Forest Meteorology, Journal Year: 2023, Volume and Issue: 331, P. 109352 - 109352

Published: Feb. 2, 2023

Language: Английский

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Selection processes of Arctic seasonal glacier snowpack bacterial communities

Microbiome, Journal Year: 2023, Volume and Issue: 11(1)

Published: March 2, 2023

Abstract Background Arctic snowpack microbial communities are continually subject to dynamic chemical and input from the atmosphere. As such, factors that contribute structuring their complex have yet be completely resolved. These can used evaluate whether they fit niche-based or neutral assembly theories. Methods We sampled snow 22 glacier sites on 7 glaciers across Svalbard in April during maximum accumulation period prior melt drive metataxonomy. snowpacks were seasonal, accumulating early winter bare ice firn melting out autumn. Using a Bayesian fitting strategy Hubbell’s Unified Neutral Theory of Biodiversity at multiple sites, we tested for neutrality defined immigration rates different taxonomic levels. Bacterial abundance diversity measured amount potential ice-nucleating bacteria was calculated. The composition (anions, cations, organic acids) particulate impurity load (elemental carbon) spring also characterized. these data addition geographical information assess possible effects using multivariate variable partitioning analysis. Results While certain signals found model, clear evidence selection observed most sites. Inorganic chemistry not linked directly diversity, but helped identify predominant colonization sources predict abundance, which tightly sea spray. Organic acids significant predictors diversity. At low acid concentrations, structure represented seeding community closely, evolved away it higher with concomitant increases bacterial numbers. Conclusions results indicate environmental plays role future studies should focus activity growth.

Language: Английский

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Bacterial and plant community successional pathways in glacier forefields of the Western Himalaya

European Journal of Soil Biology, Journal Year: 2023, Volume and Issue: 119, P. 103565 - 103565

Published: Oct. 13, 2023

Language: Английский

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