Role of human activity and land use change in atmospheric chemistry and air quality. Revision 1

摘要

In this report, the importance of CO(sub 2), CH(sub 4), N(sub 2)O, and COS for atmospheric chemistry, air quality, and climate is discussed. Current estimates of the sources for each specie, deriving the fraction of each source that is due to specific land use practices or land cover categories are reviewed. Understanding the current trends of those species with known increasing abundances and projecting increases into the future is possible if the estimated sources from human activity and land use change can be projected and if the known atmospheric sinks and the interactions in atmospheric chemistry and climate change are appropriately taken into account Regional trends in the short-lived species can be projected as well, assuming the estimated sources and sinks are correct However, significant uncertainties continue to surround the estimated budgets for most of these species. Uncertainties and the estimated ranges in different source strength estimates for each specie are also discussed.