ENSO Impact on landslide generation in northwestern Argentina
- Climatic changes are of major importance in landslide generation in the Argentine Andes. Increased humidity as a potential influential factor was inferred from the temporal clustering of landslide deposits during a period of significantly wetter climate, 30,000 years ago. A change in seasonality was tested by comparing past (inferred from annual-layered lake deposits, 30,000 years old) and modern (present-day observations) precipitation changes. Quantitative analysis of cross recurrence plots were developed to compare the influence of the El Nino/Southern Oscillation (ENSO) on present and past rainfall variations. This analysis has shown the stronger influence of NE trades in the location of landslide deposits in the intra-andean basin and valleys, what caused a higher contrast between summer and winter rainfall and an increasing of precipitation in La Nina years. This is believed to reduce thresholds for landslide generation in the arid to semiarid intra-andean basins and valleys.
Author details: | Norbert MarwanORCiDGND, Udo Schwarz, Jürgen KurthsORCiDGND, Manfred StreckerORCiDGND |
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ISSN: | 1029-7006 |
Publication type: | Article |
Language: | English |
Year of first publication: | 2000 |
Publication year: | 2000 |
Release date: | 2017/03/24 |
Source: | Geophysical research abstracts. - ISSN 1029-7006. - ISSN 1607-7962. - 2 (2000) |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften | |
Institution name at the time of the publication: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik |