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Istituto sull'inquinamento atmosferico

Torna all'elenco Contributi in rivista anno 2010

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Evidence of Reactive Aromatics As a Major Source of Peroxy Acetyl Nitrate over China

Anno di pubblicazione: 2010

Formato: Elettronico

Autori: Zhen Liu (a); Yuhang Wang (a); Dasa Gu (a); Chun Zhao (a)(b); L. Gregory Huey (a); Robert Stickel (a); Jin Liao (a); Min Shao (c); Tong Zhu (c); Limin Zeng (c); Shaw-Chen Liu (d); Chih-Chung Chang (d); Antonio Amoroso (e); Francesca Costabile (e)

Affiliazioni autori: (a) Georgia Institute of Technology, Atlanta, GA, United States (b) The Pacific Northwest National Laboratory, Richland, United States (c) Peking University (d) Academic Sinica (e) National Research Council (CNR-IIA)

Autori CNR:

  • FRANCESCA COSTABILE

Lingua: inglese

Abstract: We analyze the observations of near-surface peroxy acetyl nitrate (PAN) and its precursors in Beijing, China in August of 2007. The levels of PAN are remarkably high (up to 14 ppbv), surpassing those measured over other urban regions in recent years. Analyses employing a 1-D version of a chemical transport model (Regional chEmical and trAnsport Model, REAM) indicate that aromatic non-methane hydrocarbons (NMHCs) are the dominant (55-75%) PAN source. The major oxidation product of aromatics that produces acetyl peroxy radicals is methylglyoxal (MGLY). PAN and O3 in the observations are correlated at daytime; aromatic NMHCs appear to play an important role in O3 photochemistry. Previous NMHC measurements indicate the presence of reactive aromatics at high levels over broad polluted regions of China. Aromatics are often ignored in global and (to a lesser degree) regional 3D photochemical transport models; their emissions over China aswellasphotochemistryarequiteuncertain.Ourfindingssuggest that critical assessments of aromatics emissions and chemistry (such as the yields of MGLY) are necessary to understand and assess ozone photochemistry and regional pollution export in China.

Pagine da: 7017

Pagine a: 7022

Rivista:

Environmental science & technology American Chemical Society,
Paese di pubblicazione: Stati Uniti d'America
Lingua: inglese
ISSN: 0013-936X

Numero volume: 44

Numero fascicolo: 18

DOI: 10.1021/es1007966

Indicizzato da:

  • ISI Web of Science (WOS) [000281629800020]
  • Scopus [2-s2.0-77956525315]
  • PubMed [20707413]

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