LIDAR observations of lower stratospheric aerosols over South Africa linked to large scale transport across the southern subtropical barrier

Details LIDAR observations of lower stratospheric aerosols over South Africa linked to large scale transport across the southern subtropical barrier LIDAR observations of lower stratospheric aerosols over South Africa linked to large scale transport across the southern subtropical barrier

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jastp..65..707b&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 65, Issue 6, p. 707-715.

Physics

7

Scientific paper

The study of the variability of stratospheric aerosols and the transfer between the different atmospheric regions improves our understanding of dynamical processes involved in isentropic exchanges that take place episodically in the lower stratosphere through the subtropical barrier. One useful approach consists in combining in situ ground-based and global measurements with numerical analyses. The present paper reports on a case study of a horizontal transfer evidenced first by Rayleigh-Mie LIDAR observations over Durban (/29.9°S, /31.0°E, South Africa). Additional data from MeteoSat and SAGE-2 experiments, and from ECMWF meteorological analysis have been used in this study. Contour advection maps of potential vorticity from the MIMOSA model derived from ECMWF fields, were also used.
By the end of April, 1999, LIDAR observations showed that aerosol extinction, in the lower stratosphere, has increased significantly and abnormally in comparison with other LIDAR and SAGE-2 observations recorded for the period from April 20 to June 14, 1999. The dynamical context of this case study seems to exclude the possibility of a local influence of the subtropical jet stream or tropical convection, which could inject air masses enriched with tropospheric aerosols into the stratosphere. On the contrary, a high-resolution model based on PV advection calculations and ECMWF meteorological analyses shows that air masses are isentropically advected from the equatorial zone close to Brazil. They cross the southern barrier of the tropical reservoir due to laminae stretching and reach the southern subcontinent of Africa 5-6 days later.

Affiliated with

Also associated with

No associations

Rating

LIDAR observations of lower stratospheric aerosols over South Africa linked to large scale transport across the southern subtropical barrier does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with LIDAR observations of lower stratospheric aerosols over South Africa linked to large scale transport across the southern subtropical barrier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and LIDAR observations of lower stratospheric aerosols over South Africa linked to large scale transport across the southern subtropical barrier will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-848856