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Southern hemisphere mid‐latitude seasonal cycle in total column nitric acid
Author(s) -
Jones N. B.,
Koike M,
Matthews W. A.,
McNamara B. M.
Publication year - 1994
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 - 10.1029/94gl00304
Subject(s) - stratosphere , northern hemisphere , latitude , southern hemisphere , atmospheric sciences , annual cycle , amplitude , satellite , environmental science , seasonality , climatology , geology , physics , geodesy , mathematics , optics , statistics , astronomy
Total column ground based HNO 3 measurements were made at Lauder, New Zealand (45.0°S, 169.7°E). Approximately 760 infra‐red spectra were recorded over the period from October 1990 to October of 1993. Two micro‐windows, near 870 cm −1 , were analyzed using a non‐linear least squares spectral fitting technique. A seasonal cycle has been established with an amplitude of 27%, a minimum in February, and an annual mean of 1.2 × 10 16 molecules cm −2 . The seasonal phase, amplitude and absolute amounts of HNO 3 were found to be consistent with similar high resolution studies from Northern Hemisphere sites and with satellite measurements. Sensitivity tests indicated that the retrieved column in the stratosphere is generally insensitive to the temperature and assumed HNO 3 vertical profile.