| Autor: |
Dominguez L; Department of Earth Sciences, University of Geneva, Geneva, Switzerland. Lucia.Dominguez@unige.ch., Rossi E; Department of Earth Sciences, University of Geneva, Geneva, Switzerland., Mingari L; Barcelona Supercomputing Center, Barcelona, Spain., Bonadonna C; Department of Earth Sciences, University of Geneva, Geneva, Switzerland., Forte P; Instituto de Estudios Andinos (IDEAN) (UBA-CONICET), Buenos Aires, Argentina., Panebianco JE; INCITAP (Institute for Earth and Environmental Sciences, CONICET) and Facultad de Ciencias Exactas y Naturales, UNLPam, Santa Rosa, Argentina., Bran D; National Institute of Agricultural Technology (INTA), Bariloche, Argentina. |
| Abstrakt: |
We investigate the timescales of the horizontal mass flux decay of wind remobilised volcanic particles in Argentina, associated with the tephra-fallout deposit produced by the 2011-2012 Cordón Caulle (Chile) eruption. Particle removal processes are controlled by complex interactions of meteorological conditions, surface properties and particle depletion with time. We find that ash remobilisation follows a two-phase exponential decay with specific timescales for the initial input of fresh ash (1-74 days) and the following soil stabilisation processes (3-52 months). The characteristic timescales as a function of particle size shows two minimum values, identified for sizes around 2 and 19-37 [Formula: see text]m, suggesting that these size-range particles are remobilised more easily, due to the interaction between saltation and suspension-induced processes. We find that in volcanic regions, characterised by a sudden release and a subsequent depletion of particles, the availability of wind-erodible particles plays a major role due to compaction and removal of fine particles. We propose, therefore, a simple and reproducible empirical model to describe the mass flux decay of remobilised ash in a supply-limited environment. This methodology represents an innovative approach to link field measurements of multi-sized and supply-limited deposits with saltation erosion theory. |
