Sensitivity of volcanic aerosol dispersion to meteorological conditions: A Pinatubo case study
| Autor: | Valentina Aquila, Anthony C. Jones, Jim Haywood, Andrew Jones |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Atmospheric Science
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Intertropical Convergence Zone Climate change Subtropics 010502 geochemistry & geophysics Atmospheric sciences 01 natural sciences Aerosol Geophysics Volcano Space and Planetary Science Anticyclone Climatology Earth and Planetary Sciences (miscellaneous) Environmental science Southern Hemisphere Stratosphere 0105 earth and related environmental sciences |
| Zdroj: | Journal of Geophysical Research: Atmospheres. 121:6892-6908 |
| ISSN: | 2169-897X |
| Popis: | Using a global climate model (Hadley Centre Global Environment Model version 2-Carbon Cycle Stratosphere ) with a well-resolved stratosphere, we test the sensitivity of volcanic aerosol plume dispersion to meteorological conditions by simulating 1 day Mount Pinatubo-like eruptions on 10 consecutive days. The dispersion of the volcanic aerosol is found to be highly sensitive to the ambient meteorology for low-altitude eruptions (16–18 km), with this variability related to anomalous anticyclonic activity along the subtropical jet, which affects the permeability of the tropical pipe and controls the amount of aerosol that is retained by the tropical reservoir. Conversely, a high-altitude eruption scenario (19–29 km) exhibits low meteorological variability. Overcoming day-to-day meteorological variability by spreading the emission over 10 days is shown to produce insufficient radiative heating to loft the aerosol into the stratospheric tropical aerosol reservoir for the low eruption scenario. This results in limited penetration of aerosol into the southern hemisphere (SH) in contrast to the SH transport observed after the Pinatubo eruption. Our results have direct implications for the accurate simulation of past/future volcanic eruptions and volcanically forced climate changes, such as Intertropical Convergence Zone displacement. |
| Databáze: | OpenAIRE |
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