Hygroscopicity of Organic Aerosols Linked to Formation Mechanisms

Liu, Jieyao; Zhang, Fang; Xu, Weiqi; Sun, Yele; Chen, Lu; Li, Shangze; Ren, Jingye; Hu, Bo; Wu, Hao; Zhang, Renyi

doi:10.1029/2020gl091683

Cited by 16 publications

(31 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The diurnal cycles of both the κ and κ org are similar between winter and summer (Figures 2e and 2f), but showing slightly higher in summer than that in winter. The higher κ and κ org in summer is probably enhanced by stronger photochemical processing in summer particularly during daytime (J. Liu et al., 2021). In addition, a remarkable decline in the κ and κ org at dinner time and a slight decrease at lunch time are observed, indicating the impact of COA on aerosols hygroscopicity (Figures 2e and 2f).…”

Section: Resultsmentioning

confidence: 99%

“…More detailed calculation methods of κ and κ org are given in J. Liu et al. (2021). The volume of COA were calculated according to its mass concentration and density (1.0 g cm −3 ).…”

Section: Methodsmentioning

confidence: 99%

“…This has been demonstrated that the summer strong photochemical oxidation around noon time yields more highly oxidized OA which is more water-soluble and enhances the overall hygroscopicity of aerosols (J. Liu et al, 2021). In addition, the water solubility of COA is probably enhanced after photochemical aging by exposure to ultraviolet (Y.…”

Section: Impact Of Coa On Hygroscopicity Of the Fine Aerosol Particlesmentioning

confidence: 99%

See 2 more Smart Citations

A Large Impact of Cooking Organic Aerosol (COA) on Particle Hygroscopicity and CCN Activity in Urban Atmosphere

Liu

Zhang

et al. 2021

JGR Atmospheres

Self Cite

View full text Add to dashboard Cite

Cooking emission is a major source of fine particulate matter (PM) and organic aerosols (OA) in urban atmosphere (Abdullahi et al., 2013;Buonanno et al., 2009;Reyes-Villegas et al., 2018), generating great effects on both human health and air quality. It has been reported that emissions from cooking activities have resulted in the death of millions of people annually, according to the report from World Health Organization (https://www.who.int/airpollution/household/en/) (Y. He et al., 2019).The composition of cooking aerosol, which depends on the ingredients of food materials and cooking style, varies largely in the atmosphere. Several typical tracers, such as alkanes, dicarboxylic acids, fatty acids, sterols, etc., have been used to characterize cooking source related aerosols (Abdullahi et al., 2013). In China, it has been found that the main component from cooking emission is usually C 6 -C 24 fatty acid with midlong carbon chains (L.-Y. He et al., 2004), therefore, cooking aerosols may have a large surface area (Abdullahi et al., 2013). Organic carbon (OC) emissions (1.9 × 10 4 mg year −1 ) from residential (indicated by cooking activities) are much higher than those emitted from transportation (1.5 × 10 3 mg year −1 ) in urban Beijing, according to inventory of Multiresolution Emission Inventory for China (MEIC) (F. Liu et al., 2015). A very high emission rate of toxic equivalent from cooking sources was also revealed by C.-T. Li et al. (2003).High mass concentrations of cooking source related organic aerosols (COA) have been measured in populated urban regions. For example, the higher mass concentration of COA (6.6 μg m −3 ) than the hydrocarbon OA (HOA, 5.8 μg m −3 ) has been obtained in Beijing (Y. L. Sun et al., 2013). The COA has also been found to account for higher fraction of OA than traffic-related HOA in Lanzhou (J. Xu et al., 2014). Moreover, it is found that the photochemical products from oxidation of volatile organic compounds (VOCs) can condense

show abstract

Section: Resultsmentioning

confidence: 99%

“…More detailed calculation methods of κ and κ org are given in J. Liu et al. (2021). The volume of COA were calculated according to its mass concentration and density (1.0 g cm −3 ).…”

Section: Methodsmentioning

confidence: 99%

Section: Impact Of Coa On Hygroscopicity Of the Fine Aerosol Particlesmentioning

confidence: 99%

See 1 more Smart Citation

A Large Impact of Cooking Organic Aerosol (COA) on Particle Hygroscopicity and CCN Activity in Urban Atmosphere

Liu

Zhang

et al. 2021

JGR Atmospheres

Self Cite

View full text Add to dashboard Cite

show abstract

“…The increment of N CCN or N d by the NPF ( N CCN or N d ) is usually quantified by comparing the N CCN or N d prior to and after the NPF event (Peng et al, 2014;Wu et al, 2015;Ma et al, 2016;Ren et al, 2018;Zhang et al, 2019;Fan et al, 2020 Generally, the burst in the nucleation-mode particles symbolizes the beginning of an NPF event. Here, the moment when a half-hour concentration of the nucleation-mode particles suddenly increases by orders of magnitude as high as ∼ 10 4 cm −3 during NPF cases was defined as t start .…”

Section: Methods For Calculating the Contribution Of Npf To N Ccn And N Dmentioning

confidence: 99%

“…These nucleated particles subsequently grow through coagulation or condensation processes to CCN-relevant sizes or act as CCN in convective clouds (Fan et al, 2013;Li et al, 2010). In reality, field studies have shown that these fine particles produced from NPF can subsequently result in an enhancement in N CCN at cloud-relevant supersaturation (Kalkavouras et al, 2017;Peng et al, 2014;Wu et al, 2015;Ma et al, 2016;Zhang et al, 2019). It was estimated that up to 80 % of CCN number concentration (N CCN ) is from the nucleation process in urban Beijing (Wiedensohler et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the contribution of new particle formation to cloud droplet number concentration in the urban atmosphere

et al. 2021

Self Cite

View full text Add to dashboard Cite

Abstract. The effect of new particle formation (NPF) on cloud condensation nuclei (CCN) varies widely in diverse environments. CCN or cloud droplets from NPF sources remain highly uncertain in the urban atmosphere; they are greatly affected by the high background aerosols and frequent local emissions. In this study, we quantified the effect of NPF on cloud droplet number concentration (CDNC, or Nd) at typical updraft velocities (V) in clouds based on field observations on 25 May–18 June 2017 in urban Beijing. We show that NPF increases the Nd by 32 %–40 % at V=0.3–3 m s−1 during the studied period. The Nd is reduced by 11.8 ± 5.0 % at V=3 m s−1 and 19.0 ± 4.5 % at V=0.3 m s−1 compared to that calculated from constant supersaturations due to the water vapor competition effect, which suppresses the cloud droplet formation by decreasing the environmental maximum supersaturation (Smax). The effect of water vapor competition becomes smaller at larger V that can provide more sufficient water vapor. However, under extremely high aerosol particle number concentrations, the effect of water vapor competition becomes more pronounced. As a result, although a larger increase of CCN-sized particles by NPF events is derived on clean NPF days when the number concentration of preexisting background aerosol particles is very low, no large discrepancy is presented in the enhancement of Nd by NPF between clean and polluted NPF days. We finally reveal a considerable impact of the primary sources on the evaluation of the contribution of NPF to CCN number concentration (NCCN) and Nd based on a case study. Our study highlights the importance of full consideration of both the environmental meteorological conditions and multiple sources (i.e., secondary and primary) to evaluate the effect of NPF on clouds and the associated climate effects in polluted regions.

show abstract

The influence of aerosol hygroscopicity on clouds and precipitation over Western Ghats, India

Ray,

Bhowmik,

Hazra

et al. 2024

Quart J Royal Meteoro Soc

View full text Add to dashboard Cite

We examine the role of aerosol hygroscopicity (κ) on the formation of clouds and precipitation over the Western Ghats (WG) in India using various numerical model simulations (i.e., particle‐by‐particle‐based small‐scale, high‐resolution mesoscale model). For the diffusional growth of cloud droplets, the size‐dependent hygroscopicity is used in the κ‐Köhler equation of direct numerical simulation. The results of the small‐scale model reveal that the distribution of cloud drop size varies from the initial mixing state to the well‐mixed state due to variation in κ. The value of κ is obtained from Humidified Tandem Differential Mobility Analyzer (HTDMA) instruments at the High Altitude Cloud Physics Laboratory, India. The idealized and real simulations using the Weather and Research Forecasting (WRF) model with the aerosol‐aware Thompson microphysics scheme are conducted by changing κ values. Depending on the type of clouds (shallow or deep), different κ values determine the mass and number of cloud and rain droplets. Low hygroscopicity (organics) simulates more and smaller drops, as well as uplifts below freezing level, resulting in more ice‐phase hydrometeors. Organic aerosols have a significant impact on the formation of more snow and graupel hydrometeors. As compared to high κ, low hygroscopicity weakens updrafts at the intermediate level and strengthens them at the upper level in the deep cloud region. The intensity of precipitation varies due to low and high κ. The findings indicate that aerosol composition has a significant impact on the activation of cloud condensation nuclei. This study suggests that aerosol hygroscopicity is essential in weather prediction models to integrate aerosol chemical compositions.

show abstract

Hygroscopicity of Organic Aerosols Linked to Formation Mechanisms

Cited by 16 publications

References 65 publications

A Large Impact of Cooking Organic Aerosol (COA) on Particle Hygroscopicity and CCN Activity in Urban Atmosphere

A Large Impact of Cooking Organic Aerosol (COA) on Particle Hygroscopicity and CCN Activity in Urban Atmosphere

Evaluation of the contribution of new particle formation to cloud droplet number concentration in the urban atmosphere

The influence of aerosol hygroscopicity on clouds and precipitation over Western Ghats, India

Contact Info

Product

Resources

About