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| Titel |
Scaling Characteristics of Global Tropical Rainfall |
| VerfasserIn |
V. Venugopal, Jai Sukhatme, Karthik Madhyastha |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250098793
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| Publikation (Nr.) |
 EGU/EGU2014-14502.pdf |
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| Zusammenfassung |
| We examine the presence of dominant scales of rainfall variability using 3-hourly,
0.25-degree TRMM 3B42 satellite observations by a combination of EOF and traditional
spectral analysis. In the temporal domain, we find that apart from the two externally
forced modes (seasonal and diurnal cycles), the variance of anomalies follows a
power-law. Specifically, depending on the construction of anomalies, the slope
varies between -1.34 and approximately -5/3. The spatial spectrum also shows an
uninterrupted distribution of variance between 200 to 5000 km (synoptic to planetary
scales), complementing the results obtained in temporal spectra. These slopes are
shallower than red noise spectra, suggesting that the variability observed in the
anomalies cannot be ignored as background noise. These scaling relations also suggest
that, when trying to understand the variability of tropical rainfall, all scales are
important, and it is difficult to justify a focus on isolated space and time scales. |
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