Project Details:

Major Concerns and Research Needs in Atmospheric Chemistry in the Tropics

The objective of this project is to point out major differences in the atmospheric chemistry in the tropics, its consequence to measurement techniques and network designing as well as research needs. Atmospheric chemistry in the tropical troposphere exhibits substantial differences from that at temperate latitudes. However, this subject has not received so much attention in research as temperate chemistry and the resultant lack of knowledge precludes predictive ability required for policy development. The principal difference between oxidant chemistry in tropical troposphere versus mid-latitudes rests in the different mix of reactive chemicals. The tropical environment is quite rich in naturally emitted hydrocarbons and is characteristically low in nitrogen oxides. This situation differs markedly from environment such as Los Angeles and Athens, which environments have hitherto received much study. It may be anticipated that oxidant formation is entirely limited by nitrogen oxides, but even this is not well established. Specific differences pertinent to particular locations may also include biomass burn effluents and emissions from alternative fuels, such as ethanol.

Work is continuing with a draft report in preparation for end of 1998.