Transport of bacterial cells toward the Pacific in Northern Hemisphere westerly winds

Murata, Kotaro; Zhang, Daizhou

doi:10.1016/j.atmosenv.2013.12.038

Cited by 27 publications

(22 citation statements)

References 38 publications

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“…To contrast the influence of long‐distance sources and local natural sources, we summarize the results of this study and compare them with those previously obtained at a nearby urban site in Kumamoto (Figure ), which is the largest city in the local area [ Murata and Zhang , ]. Figure shows the summary of bacterial concentration and viability values at the two sites under different synoptic weather conditions.…”

Section: Discussionmentioning

confidence: 99%

“…The cell concentration in the air was calculated based on the cell counts following the subtraction of the blank controls. Details about the efficiency of the methodology and observational procedures are described by Murata and Zhang [, ].…”

Section: Methodsmentioning

confidence: 98%

“…Recently, efforts have been made to explore the dependence of the concentration and viability of bacteria on thermodynamically different air parcels in East Asia. Murata and Zhang [] found that the postfrontal air parcels that follow cold fronts efficiently conveyed bacteria from the Asian continent toward the northwestern Pacific, even in the absence of dust, and the bacterial viability (the ratio of viable cells to total cells) was also closely correlated with the thermodynamic properties of the air parcels. Using DNA‐based methods coupled with gas and aerosol measurements and backward trajectory analysis, Smith et al [] and Smith et al [] demonstrated that westerly winds conveyed bacterial cells from Asia to North America.…”

Section: Introductionmentioning

confidence: 99%

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Concentration of bacterial aerosols in response to synoptic weather and land‐sea breeze at a seaside site downwind of the Asian continent

Murata

Zhang

2016

JGR Atmospheres

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Airborne bacteria are a major group of bioaerosols, but their temporal and spatial variations in the atmosphere are poorly understood due to a lack of accurate information at an appropriate temporal resolution. In this study, we quantified the concentration and viability of airborne bacteria at a seaside site on the southwestern coast of Japan in spring to investigate their association with synoptic weather, which was governed alternately by cyclones and anticyclones moving in the middle‐latitude westerly flow. The concentration of bacteria, on the order of 105–106 cells m−3, showed a small amplitude of variation, while the viability significantly differed in the range of 23–96% under different weather conditions. Cyclones transported bacteria from the Asian continent in their postfrontal air. Compared to bacteria under other weather conditions, the bacteria in postfrontal air had a large concentration, a low viability, and a close correlation with coarse aerosol particles. In contrast, bacterial concentration and viability in prefrontal air varied over small ranges, and no correlation between bacteria and aerosol particle number concentration was observed. During anticyclones, although bacterial concentration was similar to that in prefrontal air, bacterial viability was high, and the concentration had pulse increases of approximately 2 times the usual level when the wind changed to land/sea breezes. The increases were attributed to the accumulation of bacteria in stagnant air due to local sources. These results show the following two distinct patterns of bacterial concentration and viability at the seaside location of this study: (1) during postfrontal long‐distance dust plume transport related to a cyclone approaching from the Asian continent, the bacterial concentration is correlated with the coarse aerosol particle number concentration and the bacterial viability is low, and (2) pulse increases of viable bacteria are observed at anticyclone conditions corresponding to local sources and land‐sea breeze conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Concentration of bacterial aerosols in response to synoptic weather and land‐sea breeze at a seaside site downwind of the Asian continent

Murata

Zhang

2016

JGR Atmospheres

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“…After that, more data on the abundance and viability of bacteria in dust plumes at the same place were obtained (Murata and Zhang 2014). The results clearly show a very good correlation between the number concentration of bacteria and dust particles (Fig.…”

Section: Transport With Asian Dustmentioning

confidence: 69%

Concentration and Viability of Bacterial Aerosols Associated with Weather in Asian Continental Outflow: Current Understanding

Zhang

Murata

et al. 2017

Aerosol Sci Eng

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Constituting a major fraction of bioaerosols, airborne bacteria take part in various atmospheric processes. Studies have suggested that airborne bacteria likely play an important role in cloud formation and consequently influence the solar radiation transfer and chemical conversions in the atmosphere, in addition to acting as links between geographically isolated microbial communities. However, how bacteria are dispersed in airflows remains poorly understood, because of the lack of reliable methods to describe the variations of airborne bacteria responding to changes in weather. We developed a simple method based on epifluorescence enumeration using LIVE/DEAD BacLight stain, by which we measured the concentrations of viable and non-viable bacterial cells in open air at a time resolution of 1 h or less. Although this method is laborintensive, laboratory experiments and applications in field observations have demonstrated its reliability and effectiveness in studies on the correlation between airborne bacteria and Asian dust, the dependence of airborne bacteria on regional and synoptic weather, and the presence of bacteria in rainwater. In this short review, we briefly introduce the method, report the progress with its application to bacteria in Asian continental outflow, address the significance of meteorological factors in controlling the variation of airborne bacteria, and give perspectives on future studies in terms of the dynamics of bacterial aerosols in the atmosphere.

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“…Cells with an aerodynamic diameter less than 10 μm are geographically disseminated over long distances and have been shown to retain their viability after intercontinental transport (Griffin et al, 2006;Hara and Zhang, 2012;Murata and Zhang, 2014;Smith et al, 2012;Smith et al, 2013). Certain microbes may even retain their metabolic function in the atmosphere (Sattler et al, 2001;Vaïtilingom et al, 2011) or have active roles in meteorological processes such as ice nucleation (Christner et al, 2008;Joly et al, 2014) or cloud formation (Bauer et al, 2002;Pöschl et al, 2010).…”

Section: Introductionmentioning

confidence: 98%

A method for sampling microbial aerosols using high altitude balloons

Bryan¹,

Stewart²,

Granger³

et al. 2014

Journal of Microbiological Methods

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Transport of bacterial cells toward the Pacific in Northern Hemisphere westerly winds

Cited by 27 publications

References 38 publications

Concentration of bacterial aerosols in response to synoptic weather and land‐sea breeze at a seaside site downwind of the Asian continent

Concentration of bacterial aerosols in response to synoptic weather and land‐sea breeze at a seaside site downwind of the Asian continent

Concentration and Viability of Bacterial Aerosols Associated with Weather in Asian Continental Outflow: Current Understanding

A method for sampling microbial aerosols using high altitude balloons

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