Airborne measurements of stratospheric constituents over the Arctic in the winter of 1989

Details Airborne measurements of stratospheric constituents over the Arctic in the winter of 1989 Airborne measurements of stratospheric constituents over the Arctic in the winter of 1989

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..473m&link_type=abstract

Geophysical Research Letters, Supplement (ISSN 0094-8276), vol. 17, March 1990, p. 473-476. Research supported by NSF.

Physics

40

Absorption Spectra, Arctic Regions, Atmospheric Attenuation, Atmospheric Chemistry, Atmospheric Composition, Stratosphere, Airborne Equipment, Fourier Transformation, Infrared Spectrometers, Spectrum Analysis, Vortices

Scientific paper

A Fourier transform spectrometer aboard the NASA DC-8 aircraft was used during the Airborne Arctic Stratospheric Expedition (AASE) to record infrared absorption spectra of the polar stratosphere. From these high resolution spectra, vertical column amounts above flight altitude were derived of O3, CH4, N2O, H2O, HCl, HF, NO, NO2, ClONO2, and HNO3 for eleven flights poleward of 60 deg N. In this paper, measurements on the flight of January 26, 1989 were derived when the flight path during the observations crossed from outside the polar vortex to inside. This allowed a clear comparison of the conditions of the air within the vortex with that outside. Observations of passive tracers such as CH4 and HF indicate that air of a certain composition within the polar vortex occurs at lower altitude than air outside. Within the vortex, markedly reduced columns of HCl and NO2. The ratio of HCl to HF column dropped from its typical midlatitude value of 4.5 to as low as 1.7 within the vortex, implying that the HCl had been chemically or physically removed from the air in the vortex. In contrast to the Antarctic observations, HNO3 values were elevated within the vortex.

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