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| Titel |
Precipitation changes in the South American Altiplano since 1300 AD reconstructed by tree-rings |
| VerfasserIn |
M. S. Morales, D. A. Christie, R. Villalba, J. Argollo, J. Pacajes, J. S. Silva, C. A. Alvarez, J. C. Llancabure, C. C. Soliz Gamboa |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 8, no. 2 ; Nr. 8, no. 2 (2012-03-30), S.653-666 |
| Datensatznummer |
250005475
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| Publikation (Nr.) |
 copernicus.org/cp-8-653-2012.pdf |
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| Zusammenfassung |
| Throughout the second half of the 20th century, the
Central Andes has experienced significant climatic and environmental changes
characterized by a persistent warming trend, an increase in elevation of the
0 °C isotherm, and sustained glacier shrinkage. These changes have
occurred in conjunction with a steadily growing demand for water resources.
Given the short span of instrumental hydroclimatic records in this region,
longer time span records are needed to understand the nature of climate
variability and to improve the predictability of precipitation, a key factor
modulating the socio-economic development in the South American Altiplano
and adjacent arid lowlands. In this study we present the first
quasi-millennial, tree-ring based precipitation reconstruction for the South
American Altiplano. This annual (November–October) precipitation reconstruction is
based on the Polylepis tarapacana tree-ring width series and represents the closest
dendroclimatological record to the Equator in South America. This
high-resolution reconstruction covers the past 707 yr and provides a
unique record characterizing the occurrence of extreme events and consistent
oscillations in precipitation. It also allows an assessment of the spatial
and temporal stabilities of the teleconnections between rainfall in the
Altiplano and hemispheric forcings such as El Niño-Southern Oscillation.
Since the 1930s to present, a persistent negative trend in precipitation has
been recorded in the reconstruction, with the three driest years since 1300 AD
occurring in the last 70 yr. Throughout the 707 yr, the
reconstruction contains a clear ENSO-like pattern at interannual to
multidecadal time scales, which determines inter-hemispheric linkages
between our reconstruction and other precipitation sensitive records
modulated by ENSO in North America. Our reconstruction points out that
century-scale dry periods are a recurrent feature in the Altiplano climate,
and that the future potential coupling of natural and anthropogenic-induced
droughts may have a severe impact on socio-economic activities in the
region. Water resource managers must anticipate these changes in order to
adapt to future climate change, reduce vulnerability and provide water
equitably to all users. |
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