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| Titel |
On the scaling effect in global surface air temperature anomalies |
| VerfasserIn |
C. A. Varotsos, M. N. Efstathiou, A. P. Cracknell |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 10 ; Nr. 13, no. 10 (2013-05-27), S.5243-5253 |
| Datensatznummer |
250018668
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| Publikation (Nr.) |
 copernicus.org/acp-13-5243-2013.pdf |
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| Zusammenfassung |
| The annual and the monthly mean values of the land-surface
air temperature anomalies from 1880–2011, over both hemispheres, are used
to investigate the existence of long-range correlations in their temporal
evolution. The analytical tool employed is the detrended fluctuation
analysis, which eliminates the noise of the non-stationarities that
characterize the land-surface air temperature anomalies in both hemispheres.
The reliability of the results obtained from this tool (e.g., power-law
scaling) is investigated, especially for large scales, by using error bounds
statistics, the autocorrelation function (e.g., rejection of its exponential
decay) and the method of local slopes (e.g., their constancy in a sufficient
range). The main finding is that deviations of one sign of the land-surface
air temperature anomalies in both hemispheres are generally followed by
deviations with the same sign at different time intervals. In other words,
the land-surface air temperature anomalies exhibit persistent behaviour,
i.e., deviations tend to keep the same sign. Taking into account our earlier
study, according to which the land and sea surface temperature anomalies
exhibit scaling behaviour in the Northern and Southern Hemisphere, we
conclude that the difference between the scaling exponents mainly stems from
the sea surface temperature, which exhibits a stronger memory in the
Southern than in the Northern Hemisphere. Moreover, the variability of the
scaling exponents of the annual mean values of the land-surface air
temperature anomalies versus latitude shows an increasing trend from the low
latitudes to polar regions, starting from the classical random walk (white
noise) over the tropics. There is a gradual increase of the scaling exponent
from low to high latitudes (which is stronger over the Southern Hemisphere). |
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