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| Titel |
Dry and wet rainy seasons in the Mantaro river basin (Central Peruvian Andes) |
| VerfasserIn |
Y. Silva, K. Takahashi, R. Chávez |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 2nd EGU Alexander von Humboldt Conference "The role of Geophysics in Natural Disaster Prevention" ; Nr. 14 (2008-04-10), S.261-264 |
| Datensatznummer |
250012111
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| Publikation (Nr.) |
 copernicus.org/adgeo-14-261-2008.pdf |
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| Zusammenfassung |
Monthly precipitation data from the period of 1970 to 2004 from 38
meteorological stations in the Mantaro river basin were used to classify the
rainy seasons (September–April) of each year into anomalously dry or wet,
and to determine the basin-wide extent of the anomalies based on the
Standardized Precipitation Index (SPI). The wet periods mostly occurred in
the early 1970's and during the first half of the 1980's, except for the
event that occurred in the 1993/94 period which was the strongest and most
generalized in the analyzed period. The dry periods occurred mostly
during the second half of the 1980's and the 1990's. Consistent with this, a
negative trend in precipitation of 2% per decade was found for the rainy
season, due mainly to a stronger trend (−4%/decade) during the peak phase
(January–March).
Despite previously reported significant negative correlations between El
Niño-Southern Oscillation (ENSO) and rainfall during the peak of the
rainfall season, the similar amplitude variability of precipitation during
the onset phase of the rainfall season (September–December), which is
uncorrelated with ENSO, participate to the reduction of the absolute
correlation for the full rainfall season. Correlations between rainfall in
the Mantaro basin and sea surface temperature (SST) in the tropical Atlantic are significant only near
the end of the rainy season, with more rain associated with a weaker
north-south difference in SST in the tropical Atlantic. |
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