Significant Climate Impact of Highly Hygroscopic Atmospheric Aerosols in Delhi, India

Wang, Yu and Chen, Ying (2019) Significant Climate Impact of Highly Hygroscopic Atmospheric Aerosols in Delhi, India. Geophysical Research Letters, 46 (10). pp. 5535-5545. ISSN 0094-8276

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Abstract

Hygroscopicity of aerosol (κ chem) is a key factor affecting its direct and indirect climate effects, however, long-term observation in Delhi is absent. Here we demonstrate an approach to derive κ chem from publicly available data sets and validate it (bias of 5%–30%) with long-term observations in Beijing. Using this approach, we report the first estimation of κ chem in Delhi and discuss its climate implications. The bulk-averaged κ chem of aerosols in Delhi is estimated to be 0.42 ± 0.07 during 2016–2018, implying a higher activation ability as cloud condensation nuclei in Delhi compared with Beijing and continental averages worldwide. To activate a 0.1-μm particle, it averagely requires just a supersaturation of ~0.18% ± 0.015% in Delhi but ~0.3% (Beijing), 0.28%–0.31% (Asia, Africa, and South America) and ~0.22% (Europe and North America). Our results imply that representing κ chem of Delhi using Asian/Beijing average may result in a significant underestimation of aerosol climate effects.

Item Type:
Journal Article
Journal or Publication Title:
Geophysical Research Letters
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900
Subjects:
ID Code:
133127
Deposited By:
Deposited On:
24 Apr 2019 08:15
Refereed?:
Yes
Published?:
Published
Last Modified:
30 Oct 2020 06:14