Impact of the Great China Fire of 1987 on the Tropospheric Chemistry of East Asia
There is a growing concern that biomass burning as a consequence of anthropogenic activities has significant impact on the atmospheric chemistry, climate and on the global biogeochemical cycles. Since the late seventies, when Crutzen et al. (1979) first proposed that the emissions of trace gases from biomass burning can make an important contribution to their budgets in the atmosphere, there has been an increase in the number of research activities in parts of the world with extensive biomass burning (Andreae, 1991). It is observed that biomass burning occurs mostly in the continental tropics coinciding with the local dry season (Crutzen et al., 1985). Trace gases such as carbon monoxide (CO), methane (CH4), nitrogen oxides (NOx = NO + NO2) and non-methane hydrocarbons (NMHCs) which are emitted from the burning fires play important roles in the production of ozone, thereby impacting the tropospheric photochemical oxidant cycle. Tropospheric ozone derived from satellite data is shown to be greater than 40 Dobson Units (DU) over southern Africa and tropical south Atlantic (Fishman et al., 1990; Fishman et al., 1991). Studies on the extent of the perturbation of this biomass signal on the composition of the atmosphere have been done in the past (Fishman et al., 1993). More recently, measurements were taken during the dry season of September-October 1992 in the Transport and Atmospheric Chemistry near the Equator (TRACE) Experiment (Fishman et al. 1996). The conclusions from this activity were that the widespread biomass burning in both South America and southern Africa is the dominant source of the precursor gases responsible for the huge amounts of ozone over the South Atlantic Ocean. Efforts in understanding the spatial and vertical distribution of the trace gases emitted from biomass burning have resulted in numerous insitu field campaigns and observational data. Measurements techniques such as satellite remote sensing, radiosondes and aircraft measurements are commonly being used to probe the atmosphere. On the other hand, synoptic-scale modeling of the influence of the fires on the atmosphere has been minimal, with the majority of work done in modeling the convective transport and redistribution of biomass burning emissions (Crutzen and Carmichael, 1993; Pickering et. al, 1996; Chatfield et. al, 1996).
KeywordsBiomass Burning Methane Ozone Hydrocarbon
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- Andreae, M. O., 1991, Biomass Burning: Its History, Use, and Distribution and Its Impact on Environmental Quality and Global Climate, in: Global Biomass Burning 3–21, J. S. Levine, ed., MIT Press, Cambridge, Mass.Google Scholar
- Cahoon, D. R. et al., 1991, The Great Chinese Fire of 1987: A View from Space, in: Global Biomass Burning 61–66, J. S. Levine, ed., MIT Press, Cambridge, Mass.Google Scholar
- Carmichael, G. R., 1997, personal communications.Google Scholar
- Carmichael, G. R., Peters, L. K. and Saylor, R. D., 1991, The STEM-II regional scale acid deposition and photochemical oxidation model — I, An overview of model development and applications, Atmos. Environ. 25A(10):2077–2090.Google Scholar
- Crutzen, P. J. and Andreae M. O., Biomass Burning in the Tropics: Impact on Atmospheric Chemistry and Biogeochemical Cycles, Science 250:1669–1678.Google Scholar
- Crutzen, P. J. and Carmichael, G. R., 1993, Modeling the Influence of Fires on Atmospheric Chemistry, in: Fire in the Environment: The Ecological, Atmospheric and Climatic Importance of Vegetation Fires 89–105, P. J. Crutzen and J. G. Goldammer, eds., John Wiley & Sons Ltd., New York.Google Scholar
- Fishman, J. et al., 1993, Group Report: What is the Impact of Fires on Atmospheric Chemistry, Climate, and Biogeochemical Cycles?, in: Fire in the Environment: The Ecological, Atmospheric and Climatic Importance of Vegetation Fires 345–356,P. J. Crutzen and J. G. Goldammer, eds., John Wiley & Sons Ltd., New York.Google Scholar
- Fujita, S., 1992, Acid Deposition in Japan, in: Report of the Central Research Institute of Electric Power Industry, Japan.Google Scholar
- Kotamarthi, V. R. and Carmichael, G. R., 1990, The Long Range Transport of Pollutants in the Pacific Rim Region, Atmos. Environ. 24A (1990):1521–1534.Google Scholar
- Lobert, J. M. et al, 1991, Experimental evaluation of biomass burning emissions: Nitrogen and carbon containing compounds, in: Global Biomass Burning 289–404, J. S. Levine, ed., MIT Press, Cambridge, Mass.Google Scholar
- Zhang, Y., 1994, The chemical role of mineral aerosols in the troposphere in east Asia. Ph.D. Thesis, Dept. of Chem. & Biochem. Eng., Univ. of Iowa, Iowa City.Google Scholar