Divergent Evolution of Carbonaceous Aerosols during Dispersal of East Asian Haze

Wenzheng Fang, August Andersson, Mei Zheng, Meehye Lee, Henry Holmstrand, Sang Woo Kim, Ke Du, Örjan Gustafsson

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Wintertime East Asia is plagued by severe haze episodes, characterized by large contributions of carbonaceous aerosols. However, the sources and atmospheric transformations of these major components are poorly constrained, hindering development of efficient mitigation strategies and detailed modelling of effects. Here we present dual carbon isotope (δ13C and Δ14C) signatures for black carbon (BC), organic carbon (OC) and water-soluble organic carbon (WSOC) aerosols collected in urban (Beijing and BC for Shanghai) and regional receptors (e.g., Korea Climate Observatory at Gosan) during January 2014. Fossil sources (>50%) dominate BC at all sites with most stemming from coal combustion, except for Shanghai, where liquid fossil source is largest. During source-to-receptor transport, the δ13C fingerprint becomes enriched for WSOC but depleted for water-insoluble OC (WIOC). This reveals that the atmospheric processing of these two major pools are fundamentally different. The photochemical aging (e.g., photodissociation, photooxidation) during formation and transport can release CO2/CO or short-chain VOCs with lighter carbon, whereas the remaining WSOC becomes increasingly enriched in δ13C. On the other hand, several processes, e.g., secondary formation, rearrangement reaction in the particle phase, and photooxidation can influence WIOC. Taken together, this study highlights high fossil contributions for all carbonaceous aerosol sub-compartments in East Asia, and suggests different transformation pathways for different classes of carbonaceous aerosols.

Original languageEnglish
Article number10422
JournalScientific Reports
Volume7
Issue number1
DOIs
Publication statusPublished - 2017 Dec 1

Fingerprint

haze
organic carbon
aerosol
black carbon
photooxidation
fossil
water
volatile organic compound
carbon isotope
mitigation
observatory
liquid
carbon
climate
modeling
Asia

ASJC Scopus subject areas

  • General

Cite this

Fang, W., Andersson, A., Zheng, M., Lee, M., Holmstrand, H., Kim, S. W., ... Gustafsson, Ö. (2017). Divergent Evolution of Carbonaceous Aerosols during Dispersal of East Asian Haze. Scientific Reports, 7(1), [10422]. https://doi.org/10.1038/s41598-017-10766-4

Divergent Evolution of Carbonaceous Aerosols during Dispersal of East Asian Haze. / Fang, Wenzheng; Andersson, August; Zheng, Mei; Lee, Meehye; Holmstrand, Henry; Kim, Sang Woo; Du, Ke; Gustafsson, Örjan.

In: Scientific Reports, Vol. 7, No. 1, 10422, 01.12.2017.

Research output: Contribution to journalArticle

Fang, W, Andersson, A, Zheng, M, Lee, M, Holmstrand, H, Kim, SW, Du, K & Gustafsson, Ö 2017, 'Divergent Evolution of Carbonaceous Aerosols during Dispersal of East Asian Haze', Scientific Reports, vol. 7, no. 1, 10422. https://doi.org/10.1038/s41598-017-10766-4
Fang, Wenzheng ; Andersson, August ; Zheng, Mei ; Lee, Meehye ; Holmstrand, Henry ; Kim, Sang Woo ; Du, Ke ; Gustafsson, Örjan. / Divergent Evolution of Carbonaceous Aerosols during Dispersal of East Asian Haze. In: Scientific Reports. 2017 ; Vol. 7, No. 1.
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