On the observations of Mount St Helens volcanic emissions: Research note

Chung, Yong-Seung; Gallant, A.; Fanaki, F.; Millán, M.

doi:10.1080/07055900.1981.9649108

Cited by 9 publications

(3 citation statements)

References 3 publications

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“…Besides, by using the plume transport direction aloft as a tracer of opportunity of the wind field at the plume (air pollutants) transport height, it is possible to identify the diurnal advective regimes in the mid-troposphere. Previous studies in different climatological and geographical regions have already used plume transport directions aloft to track the main dispersive characteristics and daily evolution of the windfield at the plume transport height (Millán, 1979;Guillot et al, 1979;Chung et al, 1981;Hoff et al, 1982;Portelli, 1982;Millán et al, 1987;Eastman et al, 1995;Palau et al, 2005). This availability of measurements aloft, obtained by means of a vehicle equipped with a COSPEC remote sensor, represents a clear advantage over the information provided by the fixed ground-level monitoring stations for atmospheric pollutant control, especially on mid-latitude complex terrain (where vertical wind directional shear is the most persistent pattern).…”

Section: Acpdmentioning

confidence: 99%

A study of dispersion in complex terrain under winter conditions using high-resolution mesoscale and Lagrangian particle models

Palau¹,

Pérez-Landa²,

Meliá³

et al. 2005

Preprint

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Abstract. A mesoscale model (MM5), a dispersive Langrangian particle model (FLEXPART), and intensive meteorological and COrrelation SPECtrometer (COSPEC) measurements from a field campaign are used to examine the advection and turbulent diffusion patterns associated with interactions and forcings between topography, synoptic atmospheric flows and thermally-driven circulations. This study describes the atmospheric dispersion of emissions from a power plant with a 343-meter-tall chimney, situated on very complex terrain in the North-East of Spain, under winter conditions. During the field campaign, the plume was transported with low transversal dispersion and deformed essentially due to the effect of mechanical turbulence. The main surface impacts appeared at long distances from the emission source (more than 30 km). The results show that the coupled models (MM5 and FLEXPART) are able to predict the plume integral advection from the power plant on very complex terrain. Integral advection and turbulent dispersion are derived from the dispersive Lagrangian model output for three consecutive days so that a direct quantitative comparison has been made between the temporal evolution of the predicted three-dimensional dispersive conditions and the COSPEC measurements. Comparison between experimental and simulated transversal dispersion shows an index of agreement between 80% and 90%, within distance ranges from 6 to 33 km from the stack. Linked to the orographic features, the simulated plume impacts on the ground more than 30 km away from the stack, because of the lee waves simulated by MM5.

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Section: Acpdmentioning

confidence: 99%

A study of dispersion in complex terrain under winter conditions using high-resolution mesoscale and Lagrangian particle models

Palau¹,

Pérez-Landa²,

Meliá³

et al. 2005

Preprint

View full text Add to dashboard Cite

show abstract

“…The volcanic plume, if any, was mainly flowing in the middle atmosphere, especially at this large distance from Augustine Island. In turn, the volcanic plumes from Augustine Island were not directly (Chung et al, 1981;Mill~n et al, 1985;Chung, 1986), the Augustine Volcanic eruption was considered to be a minor one. Estimates of total emission from the Augustine Volcano are not available.…”

Section: Other Inputsmentioning

confidence: 99%

Concentrations of atmospheric constituents observed at Alert, Canada, in relation to air trajectories and synoptic systems

Chung

1989

J Atmos Chem

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“…Besides, by using the plume transport direction aloft as a tracer of opportunity of the wind field at the plume (air pollutants) transport height, it is possible to identify the diurnal advective regimes in the mid-troposphere. Previous studies in different climatological and geographical regions have already used plume transport directions aloft to track the main dispersive characteristics and daily evolution of the windfield at the plume transport height (Millán, 1979;Guillot et al, 1979;Chung et al, 1981;Hoff et al, 1982;Portelli et al, 1982;Millán et al, 1987;Eastman et al, 1995;Palau et al, 2005). This availability of measurements aloft, obtained by means of a vehicle equipped with a COSPEC remote sensor, represents a clear advantage over the information provided by the fixed ground-level monitoring stations for atmospheric pollutant control, especially on mid-latitude complex terrain (where vertical wind directional shear is the most persistent pattern).…”

Section: Appendix B Statistical Description Of the Plume Integral Advmentioning

confidence: 99%

A study of dispersion in complex terrain under winter conditions using high-resolution mesoscale and Lagrangian particle models

Palau

Pérez-Landa

Meliá³

et al. 2006

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract.A mesoscale model (MM5), a dispersive Langrangian particle model (FLEXPART), and intensive meteorological and COrrelation SPECtrometer (COSPEC) measurements from a field campaign are used to examine the advection and turbulent diffusion patterns associated with interactions and forcings between topography, synoptic atmospheric flows and thermally-driven circulations. This study describes the atmospheric dispersion of emissions from a power plant with a 343-m tall chimney, situated on very complex terrain in the North-East of Spain, under winter conditions. During the field campaign, the plume was transported with low transversal dispersion and deformed essentially due to the effect of mechanical turbulence. The main surface impacts appeared at long distances from the emission source (more than 30 km). The results show that the coupled models (MM5 and FLEXPART) are able to predict the plume integral advection from the power plant on very complex terrain. Integral advection and turbulent dispersion are derived from the dispersive Lagrangian model output for three consecutive days so that a direct quantitative comparison has been made between the temporal evolution of the predicted threedimensional dispersive conditions and the COSPEC measurements. Comparison between experimental and simulated transversal dispersion shows an index of agreement between 80% and 90%, within distance ranges from 6 to 33 km from the stack. Linked to the orographic features, the simulated plume impacts on the ground more than 30 km away from the stack, because of the lee waves simulated by MM5.

show abstract

On the observations of Mount St Helens volcanic emissions: Research note

Cited by 9 publications

References 3 publications

A study of dispersion in complex terrain under winter conditions using high-resolution mesoscale and Lagrangian particle models

A study of dispersion in complex terrain under winter conditions using high-resolution mesoscale and Lagrangian particle models

Concentrations of atmospheric constituents observed at Alert, Canada, in relation to air trajectories and synoptic systems

A study of dispersion in complex terrain under winter conditions using high-resolution mesoscale and Lagrangian particle models

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