Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-11171-2018 |
Differentiating between particle formation and growth events in an urban environment | |
Pushpawela, Buddhi; Jayaratne, Rohan; Morawska, Lidia | |
2018-08-10 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:15页码:11171-11183 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia |
英文摘要 | Small aerosols at a given location in the atmosphere often originate in situ from new particle formation (NPF). However, they can also be produced and then transported from a distant location to the point of observation where they may continue to grow to larger sizes. This study was carried out in the subtropical urban environment of Brisbane, Australia, in order to assess the relative occurrence frequencies of NPF events and particle growth events with no NPF. We used a neutral cluster and air ion spectrometer (NAIS) to monitor particles and ions in the size range 2-42 nm on 485 days, and identified 236 NPF events on 213 days. The majority of these events (37 %) occurred during the daylight hours with just 10% at night. However, the NAIS also showed particle growth with no NPF on many nights (28 %). Using a scanning mobility particle sizer (SMPS), we showed that particle growth continued at larger sizes and occurred on 70% of nights, typically under high relative humidities. Most particles in the air, especially near coastal locations, contain hygroscopic salts such as sodium chloride that may exhibit deliquescence when the relative humidity exceeds about 75 %. The growth rates of particles at night often exceeded the rates observed during NPF events. Although most of these night time growth events were preceded by day time NPF events, the latter was not a prerequisite for growth. We conclude that particle growth in the atmosphere can be easily misidentified as NPF, especially when they are monitored by an instrument that cannot detect them at the very small sizes. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000441329900003 |
WOS关键词 | ATMOSPHERIC AEROSOL-PARTICLES ; NUCLEATION MODE PARTICLES ; ION SPECTROMETER NAIS ; BOUNDARY-LAYER ; SIZE-DISTRIBUTION ; NEUTRAL CLUSTER ; BOREAL FOREST ; RATES ; NIGHTTIME ; HYYTIALA |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/15114 |
专题 | 地球科学 |
作者单位 | Queensland Univ Technol, Int Lab Air Qual & Hlth, GPO Box 2434, Brisbane, Qld 4001, Australia |
推荐引用方式 GB/T 7714 | Pushpawela, Buddhi,Jayaratne, Rohan,Morawska, Lidia. Differentiating between particle formation and growth events in an urban environment[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(15):11171-11183. |
APA | Pushpawela, Buddhi,Jayaratne, Rohan,&Morawska, Lidia.(2018).Differentiating between particle formation and growth events in an urban environment.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(15),11171-11183. |
MLA | Pushpawela, Buddhi,et al."Differentiating between particle formation and growth events in an urban environment".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.15(2018):11171-11183. |
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