Reducing Noise in the MSU Daily Lower-Tropospheric Global Temperature Dataset

The daily global-mean values of the lower-tropospheric temperature determined from microwave emissions measured by satellites are examined in terms of their signal, noise, and signal-to-noise ratio. Daily and 30-day average noise estimates are reduced by almost 50% and 35%, respectively, by analyzin...

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Bibliographic Details
Published in:Journal of climate 1995-04, Vol.8 (4), p.888-896
Main Authors: Christy, John R., Spencer, Roy W., McNider, Richard T.
Format: Article
Language:English
Subjects:
Artificial satellites
Datasets
Earth, ocean, space
Exact sciences and technology
External geophysics
Geophysics. Techniques, methods, instrumentation and models
Global climate models
Information retrieval noise
Noise reduction
Noise temperature
Satellite orbits
Signal noise
Statistical median
Time series
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Summary:The daily global-mean values of the lower-tropospheric temperature determined from microwave emissions measured by satellites are examined in terms of their signal, noise, and signal-to-noise ratio. Daily and 30-day average noise estimates are reduced by almost 50% and 35%, respectively, by analyzing and adjusting (if necessary) for errors due to 1) missing data, 2) residual harmonics of the annual cycle unique to particular satellites, 3) lack of filtering, and 4) spurious trends. After adjustments, the decadal trend of the lower-tropospheric global temperature from January 1979 through February 1994 becomes −0.058°C, or about 0.03°C per decade cooler than previously calculated.
ISSN:0894-8755
1520-0442
DOI:10.1175/1520-0442(1995)008<0888:RNITMD>2.0.CO;2