摘要
The mechanisms of new particle formation(NPF)events that occurred under high aerosol loadings(“polluted”NPF)in the atmosphere have been unclear,which has inhibited the precision of particlepollution control.To deepen the understanding of how the“polluted”NPF events occur,a one-monthcomprehensive measurement was conducted in the atmosphere of Beijing during the summer of2016.The“clean”NPF events(frequency=22%)(condensation sink,CS<0.015 s^(-1))were found to becaused by local nucleation and growth.The“polluted”NPF events(frequency=28%)(CS>0.015 s^(-1))were influenced by both local nucleation-growth and regional transport,and the contributions from thetwo factors to 6e25 nm particle number concentration were 60%and 40%,respectively.This studyemphasized the importance of the transport for nanoparticles in relatively polluted atmospheres,and forthat the regional joint particle pollution control would be an essential policy.
基金
This study is funded by the National Natural Science Foundationof China(NSFC)(grant No.91844301)
the NSFC e Creative ResearchGroup Fund(grant No.22221004)
the National Key Research andDevelopment Program of China(grant No.2022YFC3701000,Task1)
the bilateral SwedeneChina framework program“Photochemical smog in China:formation,transformation,impactand abatement strategies”(grant No.639-2013-6917).
