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HALOE observations of a slowdown in the rate of increase of HF in the lower mesosphere
Author(s) -
Considine G. D.,
Deaver L.,
Remsberg E. E.,
Russell J. M.
Publication year - 1997
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/97gl03301
Subject(s) - slowdown , troposphere , atmospheric sciences , lag , environmental science , latitude , altitude (triangle) , mesosphere , climatology , meteorology , stratosphere , geology , physics , mathematics , geodesy , computer network , geometry , political science , computer science , law
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.