Below-Cloud Aerosol Scavenging by Different-Intensity Rains in Beijing City

Luan, Tian; Guo, Xueliang; Zhang, Tianhang; Guo, Lijun

doi:10.1007/s13351-019-8079-0

Cited by 54 publications

(40 citation statements)

References 52 publications

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“…For every 10‐mm increase of precipitation amount, the PM 2.5 mass concentration was reduced by 1.7 μg/m 3 . For these relatively heavy precipitation events, the precipitation scavenging effect plays the dominant role, making the PM 2.5 mass concentration decrease with precipitation amount (Loosmore & Cederwall, ; Luan et al, ; Mircea et al, ). We use the same method to investigate the impacts of precipitation on PM 10 mass concentration.…”

Section: Analysis and Resultsmentioning

confidence: 99%

“…To exclude the impact of natural daily changes of PM 2.5 mass concentration, we only choose precipitation events with duration time no more than 1 hr. It should be more reasonable than the method defined by Luan et al () due to constraining the precipitation events within 1 hr. The impact of precipitation on PM 10 is also studied with the similar method by calculating the changes of PM 10 between 1 hr after and before the precipitation event, which is

R_{10} = {PM}_{10 endtime} - {PM}_{10 starttime,}

where R 10 is the change of PM 10 mass concentration between 1 hr after and before precipitation, PM 10endtime is the PM 10 at time 1 hr after the precipitation, and the PM 10starttime is the PM 10 at time 1 hr before the precipitation.…”

Section: Methodsmentioning

confidence: 99%

“…To exclude the impact of natural daily changes of PM 2.5 mass concentration, we only choose precipitation events with duration time no more than 1 hr. It should be more reasonable than the method defined by Luan et al (2019) due to constraining the precipitation events within 1 hr. The impact of precipitation on PM 10 is also studied with the similar method by calculating the changes of PM 10 between 1 hr after and before the precipitation event, which is…”

Section: Analysis Methodsmentioning

confidence: 99%

“…The precipitation amount also shows a great influence on scavenging efficiency (Han et al, 2019;Luan et al, 2019;Mircea et al, 2000). Relatively intense precipitation events were more efficient in removing the polluted aerosols in the atmosphere (Andronache, 2003;Chate, 2005;Loosmore & Cederwall, 2004;Luan et al, 2019;Mircea et al, 2000;Yao et al, 1999). In general, the precipitation scavenging efficiency depends on various influential factors including both aerosol and cloud properties.…”

Section: Introductionmentioning

confidence: 99%

“…Dong et al () and B. Zhang, Jiao, et al () showed that the efficiency of precipitation scavenging to PM 2.5‐10 was more than twice as that to PM 2.5 . The precipitation amount also shows a great influence on scavenging efficiency (Han et al, ; Luan et al, ; Mircea et al, ). Relatively intense precipitation events were more efficient in removing the polluted aerosols in the atmosphere (Andronache, ; Chate, ; Loosmore & Cederwall, ; Luan et al, ; Mircea et al, ; Yao et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Distinct Impacts of Light and Heavy Precipitation on PM_2.5 Mass Concentration in Beijing

Sun

Zhao

et al. 2019

Earth and Space Science

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Using hourly observation data of precipitation and PM2.5 at 12 sites in Beijing from 2015 to 2017, this study investigates the impacts of different types of precipitation on PM2.5 mass concentration, along with the characteristics of precipitation and PM2.5. There were totally 91–123 precipitation events annually, 69.7–79.4% of which has precipitation amount less than 5 mm. By investigating the differences of PM2.5 mass concentration between 1 hr after and before the precipitation events, this study finds distinct impacts of different types of precipitation on PM2.5 mass concentration. For precipitation events with amount of 0.1–0.5 mm, PM2.5 mass concentration increased with precipitation amount with a rate of 0.85 μg/m3 per 0.1 mm. For precipitation events with amount of 0.5–10 mm, there was no clear relationship between precipitation amount and PM2.5 mass concentration. For precipitation events with amount larger than 10 mm, PM2.5 mass concentration decreased with precipitation amount with a rate of 0.17 μg/m3 per 1 mm. Further analysis shows that weak precipitation less than 10 mm increased PM10, and heavy precipitation larger than 10 mm decreased PM10. The aerosol amount also affects the response of PM2.5 to precipitation, with weak pollution prone to increase with precipitation and heavy pollution prone to decrease with precipitation. Likely mechanisms are discussed, which include the aerosol hygroscopic growth and gas‐particle conversion that increase aerosol amount and precipitation scavenging that decreases aerosol amount. Shortly, the mechanisms that increase (decrease) aerosol amount more probably dominate when precipitation is light (heavy).

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Section: Analysis and Resultsmentioning

confidence: 99%

R_{10} = {PM}_{10 endtime} - {PM}_{10 starttime,}

Section: Methodsmentioning

confidence: 99%

“…To exclude the impact of natural daily changes of PM 2.5 mass concentration, we only choose precipitation events with duration time no more than 1 hr. It should be more reasonable than the method defined by Luan et al (2019) due to constraining the precipitation events within 1 hr. The impact of precipitation on PM 10 is also studied with the similar method by calculating the changes of PM 10 between 1 hr after and before the precipitation event, which is…”

Section: Analysis Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Distinct Impacts of Light and Heavy Precipitation on PM_2.5 Mass Concentration in Beijing

Sun

Zhao

et al. 2019

Earth and Space Science

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PM_2.5 decrease with precipitation as revealed by single‐point ground‐based observation

Fujino

Miyamoto

2022

Atmospheric Science Letters

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This study analyzed the observed data of precipitation and PM2.5 concentration collected over two and a half years at Tsujido, Fujisawa City, to examine a quantitative relationship between the two quantities. It was observed that the PM2.5 concentration decreased as precipitation increased. A composite analysis revealed that the PM2.5 concentration on average decreases by 20.99% 1 h after the onset of precipitation as compared to that 1 h before, which is statistically significant based on a paired t‐test. The PM2.5 concentrations decreased over 8 h period from 5 h (−5 h) before to 3 h (+3 h) after the onset of precipitation, with a particularly dramatic decrease at the onset of precipitation. Analysis of PM2.5 scavenging rates by precipitation intensity showed that the scavenging rate was 2.03% for light precipitation events, 28.15% for moderate precipitation events, and 26.75% for heavy precipitation events, indicating that the scavenging rate increased with moderate precipitation intensity and above. It is suggested that the deposition processes of rainout and washout are effective in reducing PM2.5 concentration with precipitation.

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Rising Trend of Air Pollution and Its Decadal Consequences on Meteorology and Thermal Comfort Over Gangetic West Bengal, India

Dutta

Gupta

2021

Environmental Challenges and Solutions

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Below-Cloud Aerosol Scavenging by Different-Intensity Rains in Beijing City

Cited by 54 publications

References 52 publications

Distinct Impacts of Light and Heavy Precipitation on PM_2.5 Mass Concentration in Beijing

Distinct Impacts of Light and Heavy Precipitation on PM_2.5 Mass Concentration in Beijing

PM_2.5 decrease with precipitation as revealed by single‐point ground‐based observation

Rising Trend of Air Pollution and Its Decadal Consequences on Meteorology and Thermal Comfort Over Gangetic West Bengal, India

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Below-Cloud Aerosol Scavenging by Different-Intensity Rains in Beijing City

Cited by 54 publications

References 52 publications

Distinct Impacts of Light and Heavy Precipitation on PM2.5 Mass Concentration in Beijing

Distinct Impacts of Light and Heavy Precipitation on PM2.5 Mass Concentration in Beijing

PM2.5 decrease with precipitation as revealed by single‐point ground‐based observation

Rising Trend of Air Pollution and Its Decadal Consequences on Meteorology and Thermal Comfort Over Gangetic West Bengal, India

Contact Info

Product

Resources

About

Distinct Impacts of Light and Heavy Precipitation on PM_2.5 Mass Concentration in Beijing

Distinct Impacts of Light and Heavy Precipitation on PM_2.5 Mass Concentration in Beijing

PM_2.5 decrease with precipitation as revealed by single‐point ground‐based observation