Impacts of the East Asian monsoon on lower tropospheric ozone over coastal South China

Derong Zhou, Aijun Ding, Huiting Mao, Congbin Fu, Tao Wang, L. Y. Chan, Ke Ding, Yang Zhang, Jane Liu, An Lu, Nan Hao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

32 Citations (Scopus)

Abstract

The impact of the East Asian monsoon (EAM) on climatology and interannual variability of tropospheric ozone (O3) over the coastal South China was investigated by analyzing 11 years of ozonesonde data over Hong Kong with the aid of Lagrangian dispersion modeling of carbon monoxide and calculation of an EAM index. It was found that the seasonal cycle of O3 in the lower troposphere is highly related to the EAM over the study region. Ozone enhancements in the free troposphere are associated with the monsoon-induced transport of pollutants of continental anthropogenic and biomass burning origins. Lower tropospheric O3 levels showed high interannual variability, with an annual averaged amplitude up to 61% of averaged concentrations in the boundary layer (0-1 km altitudes) and 49% below 3 km altitude. In spring and autumn, the interannual variability in boundary layer O3 levels was predominately influenced by the EAM intensity, with high O3 mixing ratios associated with northeasterly circulation anomalies.
Original languageEnglish
Article number044011
JournalEnvironmental Research Letters
Volume8
Issue number4
DOIs
Publication statusPublished - 1 Jan 2013

Keywords

  • Asian monsoon
  • climatology
  • interannual variability
  • tropospheric ozone

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)
  • Public Health, Environmental and Occupational Health

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