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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad Nacional Autónoma de México
2021
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| Online Access: | https://www.redalyc.org/articulo.oa?id=56572302001 https://www.redalyc.org/journal/565/56572302001/ https://www.redalyc.org/journal/565/56572302001/html/ https://www.redalyc.org/journal/565/56572302001/56572302001.epub https://www.redalyc.org/journal/565/56572302001/movil |
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Table of Contents:
- Seasonal precipitation in south-central Chile: Trends in extreme events since 1900 Álvaro González-Reyes Martín Jacques-Coper Ariel A. Muñoz Biología south central Chile southern annular mode (SAM) Extreme seasonal precipitation events Tripole Index of sea surface temperature of the Pacific Ocean (TPI) We study a regional precipitation time series built upon seven meteorological records from south-central Chile (SCC; 37º-42º S), which altogether cover the period 1900-2019. As a first objective, we investigated changes in the return period (RP) of dry (< P20) and wet (> P80) seasonal extreme events of precipitation (SEE) for each season. We observed a reduction in the RP of wet SEE during 1900-1950 in all seasons. Moreover, the dry SEE RP shows a reduction from 1950 to the present in all seasons. This phenomenon is noteworthy since 1900 for summer and winter, and since 1930 for autumn. Spring registers a constant RP value from 1990 onwards. As a second objective, we study possible relationships between seasonal precipitation variability and climate modes, such as the Southern Annular Mode (SAM) and the Tripole Index (TPI) of sea surface temperature (SST) over the Pacific Ocean. Summer and autumn precipitation showed a significant negative correlation with SAM activity at interannual and decadal scales, while winter and spring precipitation recorded a significant positive correlation with SST variability over multiple regions of the Pacific Ocean (including the tropics and New Zealand) and the Southern Ocean (Amundsen-Bellingshausen Sea). Finally, we confirm that SAM strongly modulates precipitation in SCC, especially in autumn, and that SEE variability in SCC is considerably associated with climate modes of tropical and extra-tropical origin. 2021 artículo científico 0187-6236 https://www.redalyc.org/articulo.oa?id=56572302001 https://www.redalyc.org/journal/565/56572302001/ https://www.redalyc.org/journal/565/56572302001/html/ https://www.redalyc.org/journal/565/56572302001/56572302001.epub https://www.redalyc.org/journal/565/56572302001/movil 10.20937/ATM.52871 en http://www.redalyc.org/revista.oa?id=565 Atmósfera application/pdf Universidad Nacional Autónoma de México Atmósfera (México) Num.4 Vol.34