TY - JOUR

T1 - Influence of vertical wind on stratospheric aerosol transport

AU - Gryazin, V. I.

AU - Beresnev, S. A.

N1 - The authors are grateful to the British Atmospheric Data Centre (BADC) for the access to the UKMO database. The work was supported in part by the Russian Foundation for Basic Research (grants No. 09-01-00649 and 09-01-00474), and by the Ministry of Education and Science of the Russian Federation (program "Development of the Scientific Potential of the Higher School (2009-2010)," Reg. No. 2.1.1/6019, and contracts No. 1571 and 1151).

PY - 2011/1

Y1 - 2011/1

N2 - The main goals of this work are climatological analysis of characteristics of vertical wind in the stratosphere and estimation of potential opportunities of its influence on stratospheric aerosol particles. High-altitude, temporal, and latitude dependences of zonal mean vertical wind velocity for the period of 1992-2006 from the UKMO atmospheric general circulation model are analyzed. It is shown that monthly averaged amplitudes of the vertical wind are approximately +/- 5 mm/s, while annual averaged ones are +/- 1 mm/s. The upward wind can provide the vertical lifting against gravity for sufficiently large (up to 3-5 mu m) aerosol particles with a density up to 1.0-1.5 g/cm(3) at stratospheric and mesospheric altitudes. The vertical wind, probably, is a substantial factor for particle motion up to altitudes of 30-40 km and can change essentially the sedimentation velocities and the residence times of stratospheric aerosols. The structure of the averaged fields of vertical wind supposes the opportunity of formation of dynamically stable aerosol layers in the middle stratosphere. With the problem regarding the action of a permanent source of monodisperse particles near the stratopause taken as an example, it is shown that if the action of the averaged vertical component is taken into account along with the gravitational sedimentation and turbulent diffusion, the standard vertical profiles of the relative concentration of particles change cardinally. Estimations for the levitation heights for particles of different densities and sizes in the stratosphere under action of gravity and vertical wind pressure are presented.

AB - The main goals of this work are climatological analysis of characteristics of vertical wind in the stratosphere and estimation of potential opportunities of its influence on stratospheric aerosol particles. High-altitude, temporal, and latitude dependences of zonal mean vertical wind velocity for the period of 1992-2006 from the UKMO atmospheric general circulation model are analyzed. It is shown that monthly averaged amplitudes of the vertical wind are approximately +/- 5 mm/s, while annual averaged ones are +/- 1 mm/s. The upward wind can provide the vertical lifting against gravity for sufficiently large (up to 3-5 mu m) aerosol particles with a density up to 1.0-1.5 g/cm(3) at stratospheric and mesospheric altitudes. The vertical wind, probably, is a substantial factor for particle motion up to altitudes of 30-40 km and can change essentially the sedimentation velocities and the residence times of stratospheric aerosols. The structure of the averaged fields of vertical wind supposes the opportunity of formation of dynamically stable aerosol layers in the middle stratosphere. With the problem regarding the action of a permanent source of monodisperse particles near the stratopause taken as an example, it is shown that if the action of the averaged vertical component is taken into account along with the gravitational sedimentation and turbulent diffusion, the standard vertical profiles of the relative concentration of particles change cardinally. Estimations for the levitation heights for particles of different densities and sizes in the stratosphere under action of gravity and vertical wind pressure are presented.

UR - https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=tsmetrics&SrcApp=tsm_test&DestApp=WOS_CPL&DestLinkType=FullRecord&KeyUT=000285781400006

UR - http://www.scopus.com/inward/record.url?partnerID=8YFLogxK&scp=78650732851

U2 - 10.1007/s00703-010-0114-8

DO - 10.1007/s00703-010-0114-8

M3 - Article

VL - 110

SP - 151

EP - 162

JO - Meteorology and Atmospheric Physics

JF - Meteorology and Atmospheric Physics

SN - 0177-7971

IS - 3-4

ER -