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| Titel |
Spatial and temporal variability of rainfall in the Nile Basin |
| VerfasserIn |
C. Onyutha, P. Willems |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 5 ; Nr. 19, no. 5 (2015-05-08), S.2227-2246 |
| Datensatznummer |
250120708
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| Publikation (Nr.) |
 copernicus.org/hess-19-2227-2015.pdf |
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| Zusammenfassung |
| Spatiotemporal variability in annual and seasonal rainfall totals were
assessed at 37 locations of the Nile Basin in Africa using quantile
perturbation method (QPM). To get insight into the spatial difference in
rainfall statistics, the stations were grouped based on the pattern of the
long-term mean (LTM) of monthly rainfall and that of temporal variability. To
find the origin of the driving forces for the temporal variability in
rainfall, correlation analyses were carried out using global monthly sea
level pressure (SLP) and sea surface temperature (SST). Further
investigations to support the obtained correlations were made using a total
of 10 climate indices. It was possible to obtain three groups of stations;
those within the equatorial region (A), Sudan and Ethiopia (B), and
Egypt (C). For group A, annual rainfall was found to be below (above) the
reference during the late 1940s to 1950s (1960s to mid-1980s). Conversely for
groups B and C, the period from 1930s to late 1950s (1960s to 1980s) was
characterized by anomalies being above (below) the reference. For group A,
significant linkages were found to Niño 3, Niño 3.4, and the North
Atlantic Ocean and Indian Ocean drivers. Correlations of annual rainfall of
group A with Pacific Ocean-related climate indices were inconclusive. With
respect to the main wet seasons, the June–September rainfall of group B has
strong connection to the influence from the Indian Ocean. For the March–May
(October–February) rainfall of group A (C), possible links to the Atlantic
and Indian oceans were found. |
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