Physical and Optical Properties of Atmospheric Aerosols in Summer at a Suburban Site in North China

Li, Junxia; Li, Peiren; Yuan, Liang; Yin, Yong; Wang, Zhenzhu; Li, Jie; Li, Yanan; Ren, Gang; Cai, Zhanchuan

doi:10.4209/aaqr.2016.12.0525

Cited by 11 publications

(6 citation statements)

References 50 publications

(71 reference statements)

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“…The same features were shown in observational studies in Beijing (Bergin et al, 2001), the Pearl River Delta (Cheng et al, 2008), Mt. Huang (Yin et al, 2010), and Shanxi (Li et al, 2017) of China, and they said that the main reason was the deliquescence occurred more frequently under high RH conditions, which was advantageous to nitrate accumulation on the surfaces of aerosol particles especially particles with larger size and led to particles size increasing. Some studies also pointed out that clouds were the main source of accumulation mode particles, and they considerably alter particles by chemical and physical processes (Hoppel et al, 1985, 1986, 1990, 1994, 1996; Hudson, 2007; Hudson et al, 2015, 2018; Noble & Hudson, 2019).…”

Section: Resultssupporting

confidence: 67%

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Spatial Distribution and Impacts of Aerosols on Clouds Under Meiyu Frontal Weather Background Over Central China Based on Aircraft Observations

Yang

et al. 2020

JGR Atmospheres

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An airborne field campaign was conducted from 10 June to 10 July 2018 in Hubei Province over central China as a part of the State Key Natural Science Foundation Project referred to as Integrative Monsoon Frontal Rainfall Experiment (IMFRE). Comprehensive observations of atmospheric aerosols and cloud characteristics in this region were collected and analyzed. In this study, data from six flights on nonprecipitating days were selected to investigate the spatial distribution of aerosols and microphysical properties of clouds. The profiles of aerosol number concentrations (Na) were 1 order of magnitude lower than those over the North Plain of China, due to the different atmospheric backgrounds, local emission, and long‐range transport. The highest Na occurred at the altitude of the temperature inversion layer (TIL), indicating that Na profiles were significantly affected by the TIL structure. Relative humidity (RH) had an effect on the aerosol size distribution where high RH values corresponded well with large values of particle mean diameter (MD). Compared with the vertical distributions of Na and MD, their horizontal directions had minor changes, except for the MD at 4,000 m in one case. Of the three flights that penetrated through the stratiform clouds, the probability distribution functions of cloud droplet number concentration (Nc), effective radius (re), and liquid water content (LWC), showed the same features with a single peak mode. Since the nucleation of aerosol in‐cloud caused the decrease of aerosol concentration, the maximum aerosol activation ratio almost reached 74%. The average spectrum of cloud droplets showed a multimodal distribution and their microphysical properties were analyzed in this study.

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Section: Resultssupporting

confidence: 67%

“…The values of measured AOD were higher in the north and south and lower in the east and west. The AOD in the region covered by the observation experiment ranged from 0.3 to 0.7, and the values were smaller than those in some northern and eastern regions of China (Li et al, 2017;Yuan et al, 2016).…”

Section: Introductionmentioning

confidence: 68%

Spatial Distribution and Impacts of Aerosols on Clouds Under Meiyu Frontal Weather Background Over Central China Based on Aircraft Observations

Yang

et al. 2020

JGR Atmospheres

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“…However, different dominant aerosol types were observed in this study. This is likely because Xinzhou is located in the middle of Shanxi Province, an important energy and industrial chemical center of China (Li et al 2015(Li et al , 2017 and an important source of coal combustion emissions in central China (Wang et al 2016). The characteristics of the site may also lead to the relatively low values of AAE.…”

Section: Aerosol Propertiesmentioning

confidence: 99%

Properties of summer radiation and aerosols at Xinzhou, a suburban site on the North China Plain

Zhang

Zhu

Xia

2020

Atmospheric and Oceanic Science Letters

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The properties of summer radiation and aerosols were studied at Xinzhou, a suburban site on the North China Plain (NCP) by using ground-based measurements in 2014. The radiation detections under clear and cloudy skies showed that longwave radiation presented a sigmate pattern, with a maximum of 392.6 W m −2 at 1700 local standard time (LST) associated with the cloud radiative forcing, and a minimum of 360.0 W m −2 at 0600 LST when the lowest surface temperature (17.1°C) occurred. Solar radiation, including global, direct, diffuse, photosynthetically active, ultraviolet-A, and ultraviolet-B, exhibited a single peak at ~1300 LST. A bimodal size distribution, with fine mode aerosols showing a peak between 0.1 and 0.2 μm and coarse mode aerosols showing a peak at ~5 μm, was observed at Xinzhou. The dominant aerosol type was black carbon coating on coarse particles (85.7%) for the cases with aerosol optical depth at 400 nm (AOD) greater than 0.4, leading to a lower single scattering albedo (0.81) than the typical value (~0.90) at the other stations on the NCP. The mean values of EAE and AAE (extinction and absorption Ångström exponent, respectively) were 1.14 ± 0.15 and 0.58 ± 0.28 for the aerosol measurements. The average of instantaneous aerosol direct radiative forcing at the bottom of the atmosphere was −138.9 ± 33.0 W m −2 for the cases with AOD > 0.4. The results in this study are expected to improve understanding at suburban sites on the NCP of aerosol properties and their impacts on regional radiation budgets.

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“…An increase in the concentration of anthropogenic aerosol particles from industrial emissions may exert a strong effect on the regional atmospheric environment and climate. From the year 2011, a few observational experiments concerning aerosols and clouds have been performed in this area, and some results have been reported (Li et al, 2011(Li et al, , 2012(Li et al, , 2015a(Li et al, , 2015b(Li et al, , 2017aWang et al, 2012), which attracted considerable attention from researchers and the public. This aircraft observation campaign was conducted at Wusu International Airport located in Taiyuan (112.55 E,37.867 N and altitude: 778 m ASL), the capital of Shanxi Province, and the observation area was mainly in the central area of Shanxi (Fig.…”

Section: Observation Areamentioning

confidence: 99%

“…AIRCRAFT MEASUREMENTS addition, the concentration of aerosol particles with sizes ranging from 10 nm to 0.1 lm could reach 10 4 cm À3 near the surface under clear sky conditions in the North China Plain (Wang et al, 2012;Zhang et al, 2014;Li et al, 2015aLi et al, , 2017a. Above 1000 m, there was a sharp decrease in N a , and the average N a decreased to 1100 cm À3 at heights ranging from 1000 m to 3500 m. The average N a further decreased to approximately 400 cm À3 above the height of 3500 m. The vertical distribution of the particle size showed different features (Fig.…”

Section: Vertical Profiles Of N a And Ed Of Aerosol Particlesmentioning

confidence: 99%

Aircraft measurements of aerosol distribution, warm cloud microphysical properties, and their relationship over the Eastern Loess Plateau in China

Ren

et al. 2019

Tellus B: Chemical and Physical Meteorology

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In situ aircraft measurements of aerosols and clouds were performed over the eastern Loess Plateau in Shanxi Province, China. The microphysical properties of both aerosols and warm clouds, including aerosol number concentration (N a), particle effective diameter (ED), number concentration of cloud droplets (N c), cloud droplet diameter (D c), and liquid water content (LWC) of clouds, determined through six flight observations performed in May 2013 were obtained and analysed. The mean magnitude of measured N a over the six flights was 10 3 cm À3 , and accumulation mode particles dominated the majority. Most EDs of aerosol particles were less than 1 lm. Large amounts of fine aerosol particles were constrained to the lower layer, with ED smaller than 0.5 lm, and N a decreased with height. The base heights of warm clouds ranged from 1000 to 2800 m. The maximum and average values of the measured N c ranged from 147 to 311 cm À3 and 51 to 157 cm À3 , respectively. The maximum and average D c ranged from 13.5 to 28.9 and 5.8 to 13.1 lm, respectively. The average LWC of warm clouds was 0.05 gÁm À3. N a was negatively correlated with N c either in the vertical or horizontal direction. N c was higher with a smaller size of cloud droplets under high aerosol loading conditions. A small number of cloud droplets with larger size were formed under low aerosol loading conditions. At a certain range of LWC, N c and D c showed a negative correlation. The increase in LWC was related to an increase in the size of cloud droplets rather than the number of cloud droplets. The cloud droplet size distribution showed that small droplets dominated the total cloud droplet concentration. A bimodal lognormal distribution function can be efficiently used to describe the average spectrum of warm cloud droplets.

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Physical and Optical Properties of Atmospheric Aerosols in Summer at a Suburban Site in North China

Cited by 11 publications

References 50 publications

Spatial Distribution and Impacts of Aerosols on Clouds Under Meiyu Frontal Weather Background Over Central China Based on Aircraft Observations

Spatial Distribution and Impacts of Aerosols on Clouds Under Meiyu Frontal Weather Background Over Central China Based on Aircraft Observations

Properties of summer radiation and aerosols at Xinzhou, a suburban site on the North China Plain

Aircraft measurements of aerosol distribution, warm cloud microphysical properties, and their relationship over the Eastern Loess Plateau in China

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