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Power spectrum analysis of the time-series of annual mean surface air temperatures

โœ Scribed by R. P. Kane; N. R. Teixeira

Publisher
Springer
Year
1990
Tongue
English
Weight
652 KB
Volume
17
Category
Article
ISSN
0165-0009

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โœฆ Synopsis

Maximum Entropy Spectral Analysis of the annual mean surface temperature series for land masses and sea in the northern and southern hemispheres indicated long-term linear warming trends of (0.12 to 0.56) ~ with superposed significant periods in the ranges T= 5-6 yr, 10-11 yr, 15 yr, 20 yr, 28-32 yr, and 55-80 yr. Extrapolation in future indicated for 2000-2030a departure of (+0.4 ~ above the 1950-70 level. However, for the 1980s, the observed values are above the expected level, probably indicating large greenhouse effects due to human intervention. In that case, our predictions would be underestimates.

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