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Pieber, S.M.* ; Henne, S.* ; Nguyen, N.A.* ; Nguyen, D.-L. ; Steinbacher, M.*

Trace Gases and Air Quality in Northwestern Vietnam During Recurrent Biomass Burning on the Indochina Peninsula Since 2014-Field Observations and Atmospheric Simulations.

In: Vegetation Fires and Pollution in Asia. 2023. 545-558 (Vegetation Fires and Pollution in Asia)
DOI
Biomass burning (BB), including forest wildfires and agricultural waste burning, is a significant source of atmospheric trace gases and aerosols that are harmful to human health and alter the Earth’s radiative balance. Here, we study the influence of BB on trace gas levels and air quality on the Indochinese Peninsula in Southeast Asia, where the dry season from mid-December until mid-April leads to regularly recurring large-scale BB until the onset of the Asian summer monsoon. Since 2014, trace gases and air quality parameters (carbon dioxide (CO2), methane (CH4), carbon monoxide (CO), and ozone (O3)) and aerosol optical properties have been continuously monitored in situ at the regional Global Atmosphere Watch (GAW) station Pha Din (PDI) in rural Northwestern Vietnam. The station is well suited to study the large-scale fires on the Indochinese Peninsula, as emission plumes are frequently transported toward the site. Our investigations indicate that the annually recurrent large-scale BB leads to CO mixing ratios at PDI that exceed 1000 ppb (24 h means), typically during the February to April dry season. Instead, mixing ratios well below 100 ppb are observed in summer, when precipitation reaches a maximum. Further, we compare CO mixing ratios from two atmospheric transport and chemistry simulations (Copernicus Atmospheric Monitoring Service (CAMS) global reanalysis and dedicated FLEXPART backward simulations) to the observations at PDI. Although the simulations tend to overestimate CO values during the periods when the highest CO mixing ratios are observed, they generally confirm BB’s large impact on PDI observations. In addition, the results indicate that mostly very fresh BB emissions are sampled in the most prominent plumes (age 24 to 72 h).
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Publikationstyp Artikel: Sammelbandbeitrag/Buchkapitel
Korrespondenzautor
Schlagwörter Aerosol ; Air Quality ; Biomass Burning ; Gaw ; Trace Gases ; Vietnam
ISSN (print) / ISBN 9783031299162
Bandtitel Vegetation Fires and Pollution in Asia
Quellenangaben Band: , Heft: , Seiten: 545-558 Artikelnummer: , Supplement: ,
Nichtpatentliteratur Publikationen
Institut(e) Cooperation Group Comprehensive Molecular Analytics (CMA)