09 Aug 2022
09 Aug 2022
Status: this preprint is currently under review for the journal ACP.

Effects of transport on a biomass burning plume from Indochina during EMeRGe-Asia identified by WRF-Chem

Chuan-Yao Lin1, Wan-Chin Chen1, Yi-Yun Chien1, Charles C. K. Chou1, Chian-Yi Liu1, Helmut Ziereis2, Hans Schlager2, Eric Förster3, Florian Obersteiner3, Ovid O. Krüger4, Bruna A. Holanda4, Mira L. Pöhlker4,a, Katharina Kaiser5,7, Johannes Schneider5, Birger Bohn8, Maria Dolores Andrés Hernández6, and John P. Burrows6 Chuan-Yao Lin et al.
  • 1Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan
  • 2Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany
  • 3Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Karlsruhe, Germany
  • 4Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany
  • 5Particle Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany
  • 6Institute of Environmental Physics, University Bremen, Bremen, Germany
  • 7Institute for Atmospheric Physics, Johannes Gutenberg University, Mainz, Germany
  • 8Institute of Energy and Climate Research IEK-8, Forschungszentrum Jülich, Jülich, Germany
  • anow at: Faculty of Physics and Earth Sciences, Leipzig Institute for Meteorology, University of Leipzig/Experimental Aerosol and Cloud Microphysics Department, Leibniz Institute for Tropospheric Research, Leipzig, Germany

Abstract. The Indochina biomass burning (BB) season in springtime has a substantial environmental impact on the surrounding areas in Asia. In this study, we evaluated the environmental impact of a major long-range BB transport event on 19 March 2018 (a flight of the HALO research aircraft, flight F0319) preceded by a minor event on 17 March 2018 (flight F0317). Aircraft data obtained during the campaign in Asia of the Effect of Megacities on the transport and transformation of pollutants on the Regional to Global scales (EMeRGe) were available between 12 March and 7 April 2018. In the F0319, results of 1-min mean carbon monoxide (CO), ozone (O3), acetone (ACE), acetonitrile (ACN), organic aerosol (OA) and black carbon aerosol (BC) concentrations were up to 312.0 ppb, 79.0 ppb, 3.0 ppb, 0.6 ppb, 6.4 µg m−3, 2.5 µg m−3 respectively, during the flight, which passed through the BB plume transport layer (BPTL) between the elevation of 2000–4000 m over the East China Sea (ECS). During F0319, CO, O3, ACE, ACN, OA and BC maximum of the 1 minute average concentrations were higher in the BPTL by 109.0 ppb, 8.0 ppb, 1.0 ppb, 0.3 ppb, 3.0 µg m−3 and 1.3 µg m−3 compared to flight F0317, respectively. Sulfate aerosol, rather than OA, showed the highest concentration at low altitudes (<1000 m) in both flights F0317 and F0319 resulting from the continental outflow in the ECS.

The transport of BB aerosols from Indochina and its impacts on the downstream area was evaluated using a WRF-Chem model. Over the ECS, the simulated BB contribution demonstrated an increasing trend from the lowest values on 17 March 2018 to the highest values on 18 and 19 March 2018 for CO, fine particulate matter (PM2.5), OA, BC, hydroxyl radicals (OH), nitrogen oxides (NOx), total reactive nitrogen (NOy), and O3; by contrast, the variation of J(O1D) decreased as the BB plume’s contribution increased over the ECS. In the low boundary layer (<1000 m), the BB plume’s contribution to most species in the remote downstream areas was <20 %. However, at the BPTL, the contribution of the long-range transported BB plume was as high as 30–80 % for most of the species (NOy, NOx, PM2.5, BC, OH, O3, and CO) over South China (SC), Taiwan, and the ECS. BB aerosols were identified as a potential source of cloud condensation nuclei, and the simulation results indicated that the transported BB plume had an effect on cloud water formation over SC and the ECS on 19 March 2018. The combination of BB aerosol enhancement with cloud water resulted in a reduction of incoming shortwave radiation at the surface in SC and the ECS which potentially has significant regional climate implications.

Chuan-Yao Lin et al.

Status: open (until 13 Oct 2022)

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Chuan-Yao Lin et al.

Chuan-Yao Lin et al.


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Short summary
During the EMeRGe campaign in Asia, atmospheric pollutants were measured on board the HALO aircraft. The WRF-Chem model was employed to evaluate the BB plume transported from Indochina and its impact on the downstream areas. The combination of BB aerosol enhancement with cloud water resulted in a reduction of incoming shortwave radiation at the surface in South China and the East China Sea which potentially has significant regional climate implications.