Characteristics of total airborne microbes at various air quality levels

Xie, Zhenglei; Li, Yanpeng; Lü, Rui; Li, Wanxin; Fan, Chunlan; Liu, Pengxia; Wang, Jinlong; Wang, Wenke

doi:10.1016/j.jaerosci.2017.11.001

Cited by 93 publications

(56 citation statements)

References 42 publications

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“…(i) The cell concentrations Ccell in the atmosphere homogenize aloft due to mixing processes and average to 245 concentrations of ~10,000 m -3 at most locations. However, spatial deviations might be present in particular locations, such as cell concentrations of > 10 6 m -3 that were found in highly polluted areas (Xie et al, 2018), and even 10 9 m -3 near the ground (Paez-Rubio et al, 2005).…”

Section: Discussion Of Uncertainties In Sba Formation 240mentioning

confidence: 99%

The global impact of bacterial processes on carbon mass

Ervens¹,

Amato²

2019

Preprint

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Abstract. Many recent studies have identified biological material as a major fraction of ambient aerosol loading. A small fraction of these bioaerosols consist of bacteria that have attracted a lot of attention due to their role in cloud formation and adverse health effects. Current atmospheric models consider bacteria as inert quantities and neglect cell growth and multiplication. We provide here a framework to estimate the production of secondary biological aerosol (SBA) mass in clouds by microbial cell growth and multiplication. The best estimate of SBA formation rates of 3.7&#8201;Tg&#8201;yr-1 are comparable to previous model estimates of the primary emission of bacteria into the atmosphere, and thus might represent a previously unrecognized source of biological aerosol material. We discuss in detail the large uncertainties associated with our estimates based on the rather sparse available data on bacteria abundance, growth conditions and properties. Additionally, the loss of water-soluble organic carbon (WSOC) due to microbial processes in cloud droplets has been suggested to compete under some conditions with WSOC loss by chemical (OH) reactions. Our estimates suggest that microbial and chemical processes might lead to a global loss of WSOC of 8&#8211;11&#8201;Tg&#8201;yr-1 and 8&#8211;20&#8201;Tg&#8201;yr-1, respectively. While also this estimate is very approximate, the analysis of the uncertainties and ranges of all parameters gives hints about the conditions under which microbial processes cannot be neglected as organic carbon sinks in clouds. Our estimates also highlight the urgent needs for more data concerning microbial concentrations, fluxes and activity in the atmosphere to evaluate the role of bacterial processes as net aerosol sink or source on various spatial and temporal scales.

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Section: Discussion Of Uncertainties In Sba Formation 240mentioning

confidence: 99%

The global impact of bacterial processes on carbon mass

Ervens¹,

Amato²

2019

Preprint

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“…Recently, there is an increased interests in studying bioaerosol dynamics during the haze events (Wei et al, 2016). Here, Xie et al (2018) studied the culturable bacterial aerosol dynamics under different air pollutions levels, and they found that the concentration levels varied greatly with season and microbial levels were not always increasing during the haze days. As an important bacterial membrane component, endotoxin exposure has attracted great attention with respect to health.…”

Section: Bioaerosol Special Issuementioning

confidence: 99%

Reprint of bioaerosol: A bridge and opportunity for many scientific research fields

Yao

2018

Journal of Aerosol Science

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Bioaerosol collectively refers to all suspended particles of biological origins in the air. In theory, all biological materials can be released either directly or resuspension into the air upon various disturbances from the earth surfaces such as soils, oceans, animals, forests, humans and etc. Once airborne, as shown in Fig. 1 biaoerosol particles could undergo human inhalation, dry/wet depositions, aerial transport, ice nucleation, cloud condensation processes, atmospheric transformation and others. Accordingly, they have important impacts on infectious disease spread, allergic diseases, bio-security, atmospheric chemistry as well as climate (Douwes et al.,

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“…近年在西安、北京与青岛等地冬季的观测结果, 都发现了霾天生物气溶胶的浓度水平显著高于非霾天的浓度水平(图3). Wei等人 [23] 采用紫外图 2 西安市 2016 年 4 月~2017 年 2 月四季总微生物气溶胶的浓度日变化 [20] Figure 2 The diurnal variation of the concentration of total airborne microbes in Xi'an from Apr. 2016 to Feb. 2017 [20] 评述图 3 (网络版彩色)霾天与非霾天生物气溶胶浓度水平的比较.…”

Section: 霾污染过程生物气溶胶的浓度水平unclassified

“…因此, 国内外学者也开展了对霾污染下图 4 (网络版彩色)微生物气溶胶浓度与空气质量的关系. (a) 短期霾 [23] ; (b) 一年霾 [20] . 代表最大值和最小值, 箱体图上下边代表上四分位数和下四分位数, 箱中横线代表中位数, 代表平均值, **代表统计学上的差异性检验P<0.01 Figure 4 (Color online) The relationship between bioaerosol concentrations and air quality.…”

Section: 霾污染过程生物气溶胶的浓度水平unclassified

“…因此, 生物气溶胶的研究, 最近十年受到越来越多的关注并取得了相当大的进展 . Xu 课题组 [14] , Ghosh 等人 [15] , Fröhlich-Nowoisky等人 [7] 和Smets等人 [16] cells/m 3 [17,18] , 1311 CFU/m 3 , 896 CFU/m 3 和4.03×10 5 cells/m 3 [19,20] , 739.5 CFU/m 3 , 952.5 CFU/m 3 和6.55×10 5 cells/m 3 [21,22] , 显示出较明显的空间差异性. 表1中其他地区的浓度数值由于都是在半个月内的短期监测结果, 所以数值变化不大, 基本都在0.5×10 5 cells/m 3 左右 [23] .…”

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