Rainfall variability of decadal and longer time scales: signal or noise?
Article
Article Title | Rainfall variability of decadal and longer time scales: signal or noise? |
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ERA Journal ID | 1978 |
Article Category | Article |
Authors | Meinke, Holger (Author), deVoil, Peter (Author), Hammer, Graeme L. (Author), Power, Scott (Author), Allan, Robert J. (Author), Stone, Roger C. (Author), Folland, Chris K. (Author) and Potgieter, Andries B. (Author) |
Journal Title | Journal of Climate |
Journal Citation | 18 (1), pp. 89-90 |
Number of Pages | 2 |
Year | 2005 |
Publisher | American Meteorological Society |
Place of Publication | Boston, MA. United States |
ISSN | 0894-8755 |
1520-0442 | |
Digital Object Identifier (DOI) | https://doi.org/10.1175/JCLI-3263.1 |
Web Address (URL) | http://journals.ametsoc.org/doi/pdf/10.1175/JCLI-3263.1 |
Abstract | Rainfall variability occurs over a wide range of temporal scales. Knowledge and understanding of such variability can lead to improved risk management practices in agricultural and other industries. Analyses of temporal patterns in 100 yr of observed monthly global sea surface temperature and sea level pressure data show that the single most important cause of explainable, terrestrial rainfall variability resides within the El Nino-Southern Oscillation (ENSO) frequency domain (2.5–8.0 yr), followed by a slightly weaker but highly significant decadal signal (9–13 yr), with some evidence of lesser but significant rainfall variability at interdecadal time scales (15–18 yr). Most of the rainfall variability significantly linked to frequencies lower than ENSO occurs in the Australasian region, with smaller effects in North and South America, central and southern Africa, and western Europe. While low-frequency (LF) signals at a decadal frequency are dominant, the variability evident was ENSO-like in all the frequency domains considered. The extent to which such LF variability is (i) predictable and (ii) either part of the overall ENSO variability or caused by independent processes remains an as yet unanswered question. Further progress can only he made through mechanistic studies using a variety of models. |
Keywords | rainfall variability; El Nino; Southern Oscillation |
ANZSRC Field of Research 2020 | 370108. Meteorology |
370202. Climatology | |
300201. Agricultural hydrology | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Department of Primary Industries, Queensland |
University of Queensland | |
Australian Bureau of Meteorology | |
Met Office, United Kingdom | |
Department of Primary Industries and Fisheries, Queensland |
https://research.usq.edu.au/item/9zq13/rainfall-variability-of-decadal-and-longer-time-scales-signal-or-noise
1970
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