Airborne Measurements of Chemical Species Near Taiwan During Mid-autumn

Between September and October, 1991, scientists from the US, Japan, Taiwan, Korea, China and Hong Kong participated in the intensive obser vation of the PEM-west program. Intensive airborne measurements of forty different kinds of chemical species were made by scientists aboard the NASA DC-8 aircraft. On October 4, 1991, the DC-8 made a special etTort to fly around Taiwan. The synoptic condition was Taiwan on the edge of the cold continental High and the subtropic High. The prevailing wind was northeast erly over western Taiwan and easterly over eastern Taiwan. The DC-8 flew from Hong Kong toward the northeastern corner of Taiwan, and then along the eastern coast, before heading back to Hong Kong from the southern tip of Taiwan. The data collected show that a locally emitted plume was detected