The dual-beam mini-DOAS technique—measurements of volcanic gas emission,plume height and plume speed with a single instrument |
| |
Authors: | Mattias Johansson Bo Galle Yan Zhang Claudia Rivera Deliang Chen Klaus Wyser |
| |
Institution: | 1.Department of Radio and Space Science,Chalmers University of Technology,Gothenburg,Sweden;2.Department of Earth Sciences,Gothenburg University,Gothenburg,Sweden;3.Swedish Metrological and Hydrological Institute,Norrk?ping,Sweden |
| |
Abstract: | The largest error in determining volcanic gas fluxes using ground based optical remote sensing instruments is typically the
determination of the plume speed, and in the case of fixed scanning instruments also the plume height. We here present a newly
developed technique capable of measuring plume height, plume speed and gas flux using one single instrument by simultaneously
collecting scattered sunlight in two directions. The angle between the two measurement directions is fixed, removing the need
for time consuming in-field calibrations. The plume height and gas flux is measured by traversing the plume and the plume
speed is measured by performing a stationary measurement underneath the plume. The instrument was tested in a field campaign
in May 2005 at Mt. Etna, Italy, where the measured results are compared to wind fields derived from a meso-scale meteorological
model (MM5). The test and comparison show that the instrument is functioning and capable of estimating wind speed at the plume
height. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|