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<p>The structure and variability of atmospheric new particle formation and particle diameter growth (NPF&amp;G) processes provide valuable insights into the underlying chemical, physical and meteorological mechanisms including atmospheric mixing and transport-related effects. Therefore, we systematically categorised and characterised the NPF&amp;G events observed over 13 years in an urban environment. Six regional-scale banana plot types with narrow onset, broad onset, arch shape, double onset, tandem growth and nocturnal occurrence were identified. Additionally, two localised types were defined: one exhibiting multiple, but underdeveloped banana shapes, and another with diverse angulate structures, both being limited in time. The localised processes typically occurred on 7% of days, and produced high (up to 60 × 10<sup>3</sup> cm<sup>−3</sup>) ultrafine particle number concentrations. Regional and localised processes can also happen on the same day. Our findings highlight the need to extend current NPF&amp;G identification and classification frameworks by incorporating an additional step to distinguish localised events from regional processes.</p>

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Types of regional and localised new aerosol particle formation and growth processes: Atmospheric Banana Atlas

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月9日

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  • Imre Salma,
  • Tamás Weidinger,
  • János Rohonczy,
  • Máté Vörösmarty

摘要

The structure and variability of atmospheric new particle formation and particle diameter growth (NPF&G) processes provide valuable insights into the underlying chemical, physical and meteorological mechanisms including atmospheric mixing and transport-related effects. Therefore, we systematically categorised and characterised the NPF&G events observed over 13 years in an urban environment. Six regional-scale banana plot types with narrow onset, broad onset, arch shape, double onset, tandem growth and nocturnal occurrence were identified. Additionally, two localised types were defined: one exhibiting multiple, but underdeveloped banana shapes, and another with diverse angulate structures, both being limited in time. The localised processes typically occurred on 7% of days, and produced high (up to 60 × 103 cm−3) ultrafine particle number concentrations. Regional and localised processes can also happen on the same day. Our findings highlight the need to extend current NPF&G identification and classification frameworks by incorporating an additional step to distinguish localised events from regional processes.