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Early calibration problems detected in TOMS Earth‐Probe aerosol signal
Author(s) -
Kiss P.,
Jánosi I. M.,
Torres O.
Publication year - 2007
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 - 10.1029/2006gl028108
Subject(s) - aerosol , total ozone mapping spectrometer , environmental science , calibration , atmospheric sciences , climatology , meteorology , remote sensing , stratosphere , geology , ozone layer , physics , quantum mechanics
TOMS (version 8) ozone and aerosol data are analyzed in order to extract characteristic temporal patterns on a near global scale. A clear annual cycle of the global average for the ozone is apparent in the measured intervals (Nimbus‐7: 1978–1993, Earth‐Probe: 1996–2005), however a similar initial periodicity disappears for the aerosol index in the Earth‐Probe records. A detailed spectral analysis revealed significant asymmetries in the Nimbus‐7 aerosol signal for the two hemispheres, which is not present in Earth‐Probe data. The available record from the Ozone Monitoring Instrument (one and a half years) shows a return to the seasonal variability seen by Nimbus‐7 in both hemispheres. This suggests that calibration difficulties of the Earth‐Probe instrument started earlier than mid 2000, when it became apparent from many indications.