HR: 16:15h
AN: GC44A-02    [Abstracts]
TI: On Some Issues in Assessing Long-term Changes of Regional Scale Air Quality
AU: Li, J
EM: ljing@mail.iap.ac.cn
AF: Department of Atmospheric Sciences,National Central University, 300 Jhongda Road, Jhongli, TWN 320 Taiwan
AU: Liu, T
EM: tliu@ncu.edu.tw
AF: Department of Atmospheric Sciences,National Central University, 300 Jhongda Road, Jhongli, TWN 320 Taiwan
AU: * Chang, J S
EM: julius@cc.ncu.edu.tw
AF: Department of Atmospheric Sciences,National Central University, 300 Jhongda Road, Jhongli, TWN 320 Taiwan
AB: Air quality databases in developing countries and regions in East Asia have been improving rapidly in the past ten years or more. For emissions data, resolutions of emissions database have been enhanced significantly; diurnal variations of major pollutants have been added; area, point line sources have been separately defined; accuracies of emissions flux have been improved. For observation data, coverage and numbers of observation stations have been increased, advanced measurement equipments have been applied; operational procedure and data quality have been improved. Therefore simple comparison of current air quality to that of the past may not be indicative of true environmental changes. Cases studies of high ozone episodes in northern Taiwan show that past ozone data had inadequate coverage missing regions of high ozone. This contributes to overestimation in ozone change in this region for the past decade. Joint use of air quality model and air quality observations allowed us to provide some preliminary estimates of the uncertainties in environmental air quality trends. We will discuss such estimates due to emissions data change, observational network change and other input changes to air quality models. It is expected that similar situations is happening in other developing areas of Southeast Asia which has been receiving increasing attention in contributing to air quality changes in this region.
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 3355 Regional modeling
SC: Global Climate Change [GC]
MN: Fall Meeting 2005