气候变化领域集成服务门户(CCPortal): Particle number size distributions and new particle formation events over the northern Indian Ocean during continental outflow

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DOI	10.1016/j.atmosenv.2020.117719
	Particle number size distributions and new particle formation events over the northern Indian Ocean during continental outflow
	Kompalli S.K.; Nair V.S.; Jayachandran V.; Gogoi M.M.; Babu S.S.
发表日期	2020
ISSN	1352-2310
卷号	238
英文摘要	The particle number concentrations, size distributions, and new particle formation (NPF) events were investigated in the South Asian outflow over the southeastern Arabian Sea (SEAS), the northern (NIO) and equatorial Indian Ocean (EIO) during the winter of 2018 based on the extensive measurements of particle number size distributions in size range 10–414 nm in the marine atmospheric boundary layer (MABL) as part of the Integrated Campaign for Aerosols, gases, and Radiation Budget (ICARB - 2018) experiment. The total particle concentrations were higher (as high as 106 cm−3; mean ~8857 ± 13425 cm−3) over the SEAS in the proximity to the continental outflow, which gradually decreased to reach the lowest values over the remote EIO (~3206 ± 4406 cm−3). Several NPF events with conspicuous bimodal size distributions and 3–10 times enhancement in nucleation particle (<25 nm) concentrations were noticed. NPF occurred more frequently over the remote oceanic EIO, but more intensely over the regions in the continental proximity demonstrating the varying precursor vapor source strengths. The vertical winds and dew point temperatures revealed the entrainment of free tropospheric air masses to the MABL enabling the downward transport of the nucleation mode particles, possibly formed in the free tropospheric altitudes, to the MABL which advected southward along with the primary outflow aerosols due to north-easterly surface winds. Collocated submicron aerosol chemical composition measurements revealed that most of the events were associated with enhanced particulate organics mass concentrations. Further investigations suggested that volatile organic compounds were possibly involved in the NPF pathways whose sources were advected polluted plumes in the outflow regions and marine emissions over the remote ocean. The newly formed particles grew to larger sizes with a median growth rate of 12 nm h−1, which suggest that these NPF events can contribute considerably to the regional aerosol loading, and potentially affect regional climate. © 2020 Elsevier Ltd
关键词	ICARB Indian Ocean aerosols Marine aerosols New particle formation Particle number size distributions South Asian outflow
语种	英语
scopus关键词	Aerosols; Air entrainment; Atmospheric boundary layer; Atmospheric movements; Budget control; Crystallization; Nucleation; Size distribution; Troposphere; Volatile organic compounds; Bimodal size distribution; Equatorial Indian Ocean; Marine atmospheric boundary layer; Nucleation mode particles; Particle concentrations; Particle number concentration; Particle number size distribution; Southeastern arabian seas; Growth rate; volatile organic compound; aerosol; boundary layer; chemical composition; dew point; growth rate; nucleation; outflow; regional climate; altitude; Arabian Sea; Article; boundary layer; chemical composition; concentration (parameter); dew; Indian Ocean; particle size; plume; priority journal; secondary organic aerosol; spatiotemporal analysis; vapor; wind; winter; Arabian Sea; Indian Ocean
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/249015
作者单位	Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695022, India
推荐引用方式 GB/T 7714	Kompalli S.K.,Nair V.S.,Jayachandran V.,et al. Particle number size distributions and new particle formation events over the northern Indian Ocean during continental outflow[J],2020,238.
APA	Kompalli S.K.,Nair V.S.,Jayachandran V.,Gogoi M.M.,&Babu S.S..(2020).Particle number size distributions and new particle formation events over the northern Indian Ocean during continental outflow.ATMOSPHERIC ENVIRONMENT,238.
MLA	Kompalli S.K.,et al."Particle number size distributions and new particle formation events over the northern Indian Ocean during continental outflow".ATMOSPHERIC ENVIRONMENT 238(2020).