The stratospheric distributions of long-lived atmospheric halocarbons over Kiruna and Sanriku observed by balloon-borne cryogenic sampling and subsequent GC analyses (大気球研究報告)

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The mixing rations of HCFCs (HCFC-22, HCFC-142b), CFCs (CFC-11, CFC-12, CFC-113, CFC-114) and Halon-1211 in the stratosphere (up to 34km) were obtained by gas chromatography / mass spectrometry (GC/MS) analysis of air samples collected by means of balloon-borne liquid-helium cryogenic samplers over Kiruna, Sweden (68°N) on February 22 and March 18, 1997, and over Sanriku, Japan (39°N) on May 30, 1997. Obtained vertical profiles of halocarbons clearly showed the photodissociation with altitude depending on their UV absorption cross sections. The reversed structure was sometimes shown, indicating the laminated structure in the lower stratosphere in early summer over Sanriku. The observation made at Kiruna showed higher mixing rations for some compounds in the edge of the polar vortex when compared to those inside the polar vortex, suggesting the mixing of air from lower latitude at the vortex edge. Comparison of the vertical profiles over kiruna and Sanriku showed latitudinal / seasonal differences in connection with meridional circulation of the atmosphere.