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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Significant Climate Impact of Highly Hygroscopic Atmospheric Aerosols in Delhi, India
AU - Wang, Yu
AU - Chen, Ying
PY - 2019/5/28
Y1 - 2019/5/28
N2 - 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.
AB - 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.
KW - Long-term
KW - kappa value
KW - light extinction enhancement
KW - PM2.5
KW - CCN
U2 - 10.1029/2019GL082339
DO - 10.1029/2019GL082339
M3 - Journal article
VL - 46
SP - 5535
EP - 5545
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 10
ER -