In:
Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 104, No. D21 ( 1999-11-20), p. 26497-26510
Abstract:
Ground‐based solar absorption spectra were measured from Fairbanks, Alaska (65°N, 148°W) from March to September 1997 by the Jet Propulsion Laboratory (JPL) MkIV Fourier transform infrared (FTIR) spectrometer. The derived column abundances of O 3 declined by 35% over this period (20% in April and May, and 15% during the summer), whereas those of HF, a long‐lived tracer, changed by less than 5%. High‐latitude, summertime balloon observations reveal similar shapes for the volume mixing ratio profiles of O 3 and HF in the lower stratosphere, where most of their column abundance resides. Vertical transport should therefore have similar effects on the column abundances of O 3 and HF. Data from the Halogen Occultation Experiment (HALOE) show a poleward decrease in the O 3 /HF ratio at all stratospheric altitudes, so that any reductions in column O 3 due to horizontal meridional transport would have been accompanied by even larger reductions in column HF. Therefore the observed column O 3 decrease must be the result of chemical loss processes. Column measurements of other atmospheric gases show a summertime maximum in the NO x /NO y column ratio and little change in the chlorine partitioning. We conclude that most of the reduction in column O 3 over Fairbanks from March to September 1997 was likely driven by NO x chemistry. These conclusions are supported by the similar behavior of column abundances measured by another ground‐based FTIR spectrometer based in Ny Ålesund, Spitsbergen, (79°N, 12°E).
Type of Medium:
Online Resource
ISSN:
0148-0227
DOI:
10.1029/1999JD900745
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1999
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