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Impact of Biomass Burning in South and Southeast Asia on Background Aerosol in Southwest China

Category: Optical/Radiative Properties and Remote Sensing

Volume: 19 | Issue: 5 | Pages: 1188-1204
DOI: 10.4209/aaqr.2018.08.0324
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Yuanxin Liang1, Huizheng Che 1, Ke Gui1, Yu Zheng1, Xianyi Yang1,2, Xiaopan Li1,2, Chao Liu1,3, Zhizhong Sheng1,2, Tianze Sun1, Xiaoye Zhang1

  • 1 State Key Laboratory of Severe Weather (LASW) and Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences, CMA, Beijing 100081, China
  • 2 Plateau Atmospheric and Environment Laboratory of Sichuan Province, College of Atmospheric Science, Chengdu University of Information Technology, Chengdu 610225, China
  • 3 School of Surveying and Land Information Engineering, Henan Polytechnic University, Henan 454000, China

Highlights

  • Comprehensive of aerosol optical properties from biomass burning.
  • 72-hour back-trajectory modeling traces the source of pollutions.
  • Ground-based observation combined with satellite fire points.

Abstract

Biomass burning (BB) in Southeast Asia is particularly pronounced during the dry season. However, the complex topography and long-range transport inherent to Southeast Asia have limited local research on pollution resulting from BB. In this study, the monthly variation in aerosol optical properties at six sites in Southeast Asia (Chiang Mai, Mukdahan, Bac-Lieu, Penang, Singapore, and Bandung) and the fire-point distribution have been analyzed in detail. The Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model was used to simulate the 72-hour back-trajectory from the Shangri-La atmospheric background station in Yunnan Province, China. Our results showed that BB was more common on the Indochinese Peninsula from March to May, whereas it was more common on the Malay Archipelago from August to October due to the latitudinal difference and crop harvest season. Significant BB activity on the Indochinese Peninsula in March resulted in a high surge in extinction (AODt440nm = 1.32 ± 0.69, AODf440nm = 1.24 ± 0.59) by particles with a smaller diameter (AE = 1.68 ± 0.13) in Chiang Mai. Mapping the long-range transport of BB aerosols reveals that Shangri-La’s pollution was primarily affected by emissions from northern-central India (accounting for 45.2%), and Bangladesh and northern Myanmar (accounting for 38.7%), which indicates that the aerosol pollution on the Yunnan-Guizhou Plateau in springtime could have originated on the southern periphery of the Tibetan Plateau. The results also indicate that BB emission in Southeast Asia had a limited impact on pollution in Southwest China but a relatively large effect on local areas. This study is the first to analyze the trend of aerosols produced from BB in Southeast Asia via ground-based observation, which deepens our understanding of the potential effects of BB aerosols transported long-range from outside Southwest China.

Keywords

Aerosol optical properties Biomass burning Southeast Asia Yunnan-Guizhou plateau


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