HALOE observations of a slowdown in the rate of increase of HF in the lower mesosphere

Details HALOE observations of a slowdown in the rate of increase of HF in the lower mesosphere HALOE observations of a slowdown in the rate of increase of HF in the lower mesosphere

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.3217c&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 24, p. 3217-3220

Physics

7

Atmospheric Composition And Structure: General Or Miscellaneous

Scientific paper

A statistical analysis of monthly averaged HF measurements from HALOE shows definite signs of a slowdown of the increase in HF at 55 km. The data used in this study are monthly averaged HF data from a latitude band from 50N to 50S at an altitude of 55 km. We find that the combination of a third-order polynomial, an annual and semi-annual cycle, and a 900-day cycle provides a good model of the data. The changes in the HF trend are consistent with the trends of CFC-11 and CFC-12 in the troposphere in the early 1990's, adjusted by an estimated lag time to account for transport from the troposphere up to 55 km.

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