New particle formation observed from a rain shadow region of the Western Ghats, India

Toxicological & Environmental Chemistry Pub Date : 2020-07-21 DOI:10.1080/02772248.2020.1789134

M. Varghese, P. Leena, P. Murugavel, S. Bankar, K. Todekar, S. Chowdhuri, P. Safai, N. Malap, M. Konwar, S. Dixit, Y. J. Rao, T. Prabha

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引用次数: 8

Abstract

Abstract This study reports on new particle formation (NPF) and characteristic features observed from a rural site falling in the rainshadow of the Western Ghats in peninsular India. A total of 35 NPF events observed during August 2018 - January 2019 are classified and analyzed here. The apparent formation rates ranged from 0.2 to 10.0 cm–3 s–1, while the growth rates of nucleation mode particles ranged from 1.2 to 13.8 nm h–1. The frequency of occurrence was least during August (core monsoon) and highest during post-monsoon. The local winds were calm and southeasterly to easterly (from the urban centre) supplying the essential precursor gases during October and November, leading to a frequent occurrence of nucleation events. Observations suggest that an increased condensation sink could limit the NPF while promoting Aitken mode growth. The newly formed particles accounted for about 10–80% of the total aerosol concentration. These newly formed particles were able to act as cloud condensation nuclei after growing to approximately 50 nm with an average activation fraction of 0.4.

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从印度西高止山脉的雨影区观察到的新粒子形成

摘要本文报道了在印度半岛西高止山脉雨影地区观测到的新粒子形成(NPF)及其特征。本文对2018年8月至2019年1月期间观测到的35起NPF事件进行了分类和分析。表观形成速率为0.2 ~ 10.0 cm-3 s-1，成核模式粒子的生长速率为1.2 ~ 13.8 nm h-1。发生频率在8月(核心季风)最少，在季风后发生频率最高。在10月和11月，当地的风是平静的东南至东风(从市中心吹来)，提供了必要的前体气体，导致成核事件频繁发生。观测结果表明，增加的凝结汇可以限制NPF，同时促进艾特肯模态的增长。新形成的颗粒约占总气溶胶浓度的10-80%。这些新形成的粒子在生长到50 nm左右，平均活化分数为0.4后，能够作为云凝结核。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Toxicological & Environmental Chemistry

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