Multiwavelength lidar measurements of stratospheric aerosols above Spitsbergen during winter 1992/93

Details Multiwavelength lidar measurements of stratospheric aerosols above Spitsbergen during winter 1992/93 Multiwavelength lidar measurements of stratospheric aerosols above Spitsbergen during winter 1992/93

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21...57b&link_type=abstract

Geophysical Research Letters, Volume 21, Issue 1, p. 57-60

Physics

36

Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Volcanic Effects, Information Related To Geographic Region: Arctic Region, Volcanology: Atmospheric Effects

Scientific paper

Within the period of December 1992 to March 1993 lidar investigations of stratospheric aerosols were performed at Ny-Ålesund, Spitsbergen (79°N, 12°E). Backscatter signals at wavelengths of 353, 532, and 1064 nm and depolarization signals at 532 nm in altitudes ranging from the tropopause up to 30 km were analyzed. Throughout the whole measurement period we observed an aerosol layer of volcanic origin in the lower stratosphere. Depolarization profiles suggest that the volcanic aerosol layer consisted mainly of liquid droplets. Comparison with model calculations indicate median particle radii between 0.1 and 0.2 μm. Surface densities exceeded approximately 40 μm2/cm in the lower part of the layer around 12 km. In January 1993 polar stratospheric clouds (PSCs) were frequently observed at altitudes up to 22 km. We analyzed the backscatter and depolarization data with respect to the temperature history of backward trajectories reaching Ny-Ålesund. Signatures for micron sized crystalline PSC particles appear for cooling rates of -1 to -3 K day-1. Larger cooling rates of -4 to -10 K day-1 produced submicron sized aerosols, presumably supercooled droplets, characterized by enhanced backscatter ratios and reduced depolarization.

Affiliated with

Also associated with

No associations

Rating

Multiwavelength lidar measurements of stratospheric aerosols above Spitsbergen during winter 1992/93 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 Multiwavelength lidar measurements of stratospheric aerosols above Spitsbergen during winter 1992/93, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiwavelength lidar measurements of stratospheric aerosols above Spitsbergen during winter 1992/93 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-869348