HR: 0800h
AN: A51C-0776    [Abstracts]
TI: High Frequency GC/MS Measurements of CFCs, HCFCs, HFCs, PFCs and SF6 at Hateruma Island
AU: * Yokouchi, Y
EM: yokouchi@nies.go.jp
AF: National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, 305-8506 Japan
AU: Mukai, H
EM: lnmukaih@nies.go.jp
AF: National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, 305-8506 Japan
AB: In order to optimally determine the sources and magnitudes of halocarbons (CFCs, HCFCs, HFCs, PFCs, SF6 and some other anthropogenic halocarbons) in East Asia / Japan from the observations, we developed a new high frequency (hourly) monitoring system for the halocarbons, and have it run at Hateruma Island since 2004 spring. The system is based on a cryogen-free preconcentration and GC/MS. All the operations including calibration procedure with standards are automated, and occasional MS tuning or test runs are operated by remote-control. Sample air is flown from the tower top (40m high) at a large flow rate and a portion of it is supplied to the analytical system. Backtrajectory analyses have shown that enhancement of the halocarbons observed at Hateruma in 2004 spring was mostly attributed to the airmasses which had traveled over Shanghai or Taipei before arriving there.
DE: 1610 Atmosphere (0315, 0325)
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting